The Light Dark Matter eXperiment (LDMX) is proposed to employ a thin tungsten target and a multi-GeV electron beam to carry out a missing momentum search for the production of dark matter candidate particles. We study the sensitivity for a complementary missing-energy-based search using the LDMX Electromagnetic Calorimeter as an active target with a focus on early running. In this context, we construct an event selection from a limited set of variables that projects sensitivity into previously-unexplored regions of light dark matter phase space — down to an effective dark photon interaction strength y of approximately 2 × 10−13 (5 × 10−12) for a 1 MeV (10 MeV) dark matter candidate mass.
", "doi": "10.1007/jhep12(2025)150", "issn": "1029-8479", "publisher": "Springer Science and Business Media LLC", "publication": "Journal of High Energy Physics", "publication_date": "2025-12", "series_number": "12", "volume": "2025", "issue": "12", "pages": "150" }, { "id": "authors:a5pdf-e1314", "collection": "authors", "collection_id": "a5pdf-e1314", "cite_using_url": "https://authors.library.caltech.edu/records/a5pdf-e1314", "type": "article", "title": "A new determination of the (Z,A) dependence of coherent muon-to-electron conversion", "author": [ { "family_name": "Borrel", "given_name": "L\u00e9o", "clpid": "Borrel-L\u00e9o" }, { "family_name": "Hitlin", "given_name": "David G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Middleton", "given_name": "Sophie", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" } ], "abstract": "Should muon-to-electron conversion in the field of a nucleus be found in the current generation of experiments, the measurement of the atomic number dependence of the process will become an important experimental goal. We present a new treatment of the (Z,A) dependence of coherent muon-to-electron conversion in 236 isotopes. Our approach differs from previous treatments in several ways. Firstly, we include the effect of permanent quadrupole deformation on the charged lepton flavor violating matrix elements, using the method of Barrett moments. This method also enables the addition of muonic X-ray nuclear size and shape determinations of the charge distribution to the electron scattering results used previously. Secondly, we employ the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) to calculate neutron-related matrix elements for even-even nuclei. This takes into account the quadrupole deformation of the neutron distributions and the fact that neutrons are, in general, in different shell model orbits than protons. The calculated conversion rates differ from previous calculations, particularly in the region of large permanent quadrupole deformation. Finally, we propose an alternative normalization of the muon-to-electron conversion rate, which is related more closely to what a given experiment actually measures, and better separates lepton physics from nuclear physics effects.
", "doi": "10.1016/j.nuclphysa.2025.123161", "issn": "0375-9474", "publisher": "Elsevier", "publication": "Nuclear Physics A", "publication_date": "2025-10", "volume": "1062", "pages": "123161" }, { "id": "authors:3ah7h-8sm31", "collection": "authors", "collection_id": "3ah7h-8sm31", "cite_using_url": "https://authors.library.caltech.edu/records/3ah7h-8sm31", "type": "article", "title": "Design and assembly status overview of the Mu2e electromagnetic calorimeter mechanical structures", "author": [ { "family_name": "Atanov", "given_name": "N.", "orcid": "0000-0003-1744-5439" }, { "family_name": "Baranov", "given_name": "V." }, { "family_name": "Benedetti", "given_name": "E.", "orcid": "0009-0008-5230-0597" }, { "family_name": "Bloise", "given_name": "C.", "orcid": "0000-0002-1563-8969" }, { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-L\u00e9o" }, { "family_name": "Ceravolo", "given_name": "S.", "orcid": "0000-0002-7904-3112" }, { "family_name": "Cervelli", "given_name": "F.", "orcid": "0000-0001-9953-6240" }, { "family_name": "Colao", "given_name": "F.", "orcid": "0000-0003-0718-3068" }, { "family_name": "Cordelli", "given_name": "M.", "orcid": "0000-0002-6579-090X" }, { "family_name": "Corradi", "given_name": "G." }, { "family_name": "Davydov", "given_name": "Yu.I.", "orcid": "0000-0001-9833-2414" }, { "family_name": "Di Falco", "given_name": "S.", "orcid": "0000-0001-5425-8988" }, { "family_name": "Diociaiuti", "given_name": "E.", "orcid": "0000-0001-8248-2119" }, { "family_name": "Donati", "given_name": "S.", "orcid": "0000-0002-6212-5234" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Fedeli", "given_name": "P.", "orcid": "0009-0002-0570-6048" }, { "family_name": "Ferrari", "given_name": "C." }, { "family_name": "Gioiosa", "given_name": "A.", "orcid": "0000-0003-2795-2602" }, { "family_name": "Giovannella", "given_name": "S.", "orcid": "0000-0002-6243-1215" }, { "family_name": "Giusti", "given_name": "V.", "orcid": "0000-0003-4318-6995" }, { "family_name": "Glagolev", "given_name": "V." }, { "family_name": "Hampai", "given_name": "D.", "orcid": "0000-0002-8881-0520" }, { "family_name": "Happacher", "given_name": "F.", "orcid": "0000-0002-5958-9003" }, { "family_name": "Hitlin", "given_name": "D.G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Martini", "given_name": "M.", "orcid": "0000-0001-9485-6384" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "S.", "orcid": "0000-0002-2182-0126" }, { "family_name": "Morescalchi", "given_name": "L.", "orcid": "0000-0002-7819-8139" }, { "family_name": "Paesani", "given_name": "D.", "orcid": "0000-0001-7015-533X" }, { "family_name": "Pasciuto", "given_name": "D.", "orcid": "0000-0001-8088-9716" }, { "family_name": "Pedreschi", "given_name": "E.", "orcid": "0000-0001-7631-3933" }, { "family_name": "Porter", "given_name": "Frank C.", "orcid": "0000-0003-1948-8889" }, { "family_name": "Raffaelli", "given_name": "F." }, { "family_name": "Saputi", "given_name": "A.", "orcid": "0000-0001-6067-7863" }, { "family_name": "Sarra", "given_name": "I.", "orcid": "0000-0002-5037-5316" }, { "family_name": "Spinella", "given_name": "F.", "orcid": "0000-0002-9607-7920" }, { "family_name": "Taffara", "given_name": "A.", "orcid": "0000-0002-6270-0518" }, { "family_name": "Zhu", "given_name": "R.Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "The “muon-to-electron conversion” (Mu2e) experiment at Fermilab will search for the Charged Lepton Flavour Violating neutrino-less coherent conversion of a muon into an electron in the field of an aluminum nucleus. The observation of this process would be the unambiguous evidence of physics beyond the Standard Model. The detector has been designed as a state-of-the-art crystal calorimeter and employs 1348 pure Cesium Iodide (CsI) crystals readout by UV-extended silicon photosensors and fast front-end and digitization electronics. A design consisting of two identical annular matrices (named “disks”) positioned at the relative distance of 70 cm, downstream the aluminum target along the muon beamline, satisfies the Mu2e physics requirements. The hostile Mu2e operational conditions, in terms of radiation levels (total ionizing dose of 90 krad and a neutron fluence of 5x10¹²n/cm²@1MeVeq(Si)/y), magnetic field intensity (1 T) and vacuum level (10\u207b\u2074 Torr) have posed tight constraints on the design of the detector mechanical structures and materials choice. The support structure of the two 674 crystal matrices employs two aluminum hollow rings and parts made of open-cell vacuum-compatible carbon fiber. The photosensors and service front-end electronics for each crystal are assembled in a unique mechanical unit inserted in a machined copper holder. The 674 units are supported by a machined plate made of vacuum-compatible plastic material. The plate also integrates the cooling system made of a network of copper lines flowing a low temperature radiation-hard fluid and placed in thermal contact with the copper holders. The data acquisition electronics is hosted in aluminum custom crates positioned on the external lateral surface of the two disks. The crates also integrate the electronics cooling system.
", "doi": "10.1016/j.nima.2024.170040", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "2025-01", "series_number": "Part 1", "volume": "1070", "issue": "Part 1", "pages": "170040" }, { "id": "authors:4bj8x-99x08", "collection": "authors", "collection_id": "4bj8x-99x08", "cite_using_url": "https://authors.library.caltech.edu/records/4bj8x-99x08", "type": "article", "title": "The Mu2e crystal and SiPM calorimeter", "author": [ { "family_name": "Atanov", "given_name": "N.", "orcid": "0000-0003-1744-5439" }, { "family_name": "Baranov", "given_name": "V." }, { "family_name": "Bloise", "given_name": "C.", "orcid": "0000-0002-1563-8969" }, { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-L\u00e9o" }, { "family_name": "Ceravolo", "given_name": "S.", "orcid": "0000-0002-7904-3112" }, { "family_name": "Cervelli", "given_name": "F.", "orcid": "0000-0001-9953-6240" }, { "family_name": "Colao", "given_name": "F." }, { "family_name": "Cordelli", "given_name": "G." }, { "family_name": "Corradi", "given_name": "G." }, { "family_name": "Davydov", "given_name": "Yu.I.", "orcid": "0000-0001-9833-2414" }, { "family_name": "Di Falco", "given_name": "S.", "orcid": "0000-0001-5425-8988" }, { "family_name": "Diociaiuti", "given_name": "E.", "orcid": "0000-0001-8248-2119" }, { "family_name": "Donati", "given_name": "S.", "orcid": "0000-0002-6212-5234" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Fedeli", "given_name": "P.", "orcid": "0009-0002-0570-6048" }, { "family_name": "Ferrari", "given_name": "C." }, { "family_name": "Gioiosa", "given_name": "A.", "orcid": "0000-0003-2795-2602" }, { "family_name": "Giovannella", "given_name": "S.", "orcid": "0000-0002-6243-1215" }, { "family_name": "Giusti", "given_name": "V.", "orcid": "0000-0003-4318-6995" }, { "family_name": "Glagolev", "given_name": "V." }, { "family_name": "Hampai", "given_name": "D.", "orcid": "0000-0002-8881-0520" }, { "family_name": "Happacher", "given_name": "F.", "orcid": "0000-0002-5958-9003" }, { "family_name": "Hitlin", "given_name": "D.G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Martini", "given_name": "M.", "orcid": "0000-0001-9485-6384" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "S.", "orcid": "0000-0002-2182-0126" }, { "family_name": "Morescalchi", "given_name": "L.", "orcid": "0000-0002-7819-8139" }, { "family_name": "Paesani", "given_name": "D.", "orcid": "0000-0001-7015-533X" }, { "family_name": "Pasciuto", "given_name": "D.", "orcid": "0000-0001-8088-9716" }, { "family_name": "Pedreschi", "given_name": "E.", "orcid": "0000-0001-7631-3933" }, { "family_name": "Porter", "given_name": "F." }, { "family_name": "Raffaelli", "given_name": "F." }, { "family_name": "Saputi", "given_name": "A.", "orcid": "0000-0001-6067-7863" }, { "family_name": "Sarra", "given_name": "I.", "orcid": "0000-0002-5037-5316" }, { "family_name": "Spinella", "given_name": "F.", "orcid": "0000-0002-9607-7920" }, { "family_name": "Taffara", "given_name": "A.", "orcid": "0000-0002-6270-0518" }, { "family_name": "Zhu", "given_name": "R.Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "The calorimeter of the Mu2e experiment is being assembled, with all production components completed and tested, apart from the digital electronics that is still underway. The mechanical structure is fully built, with a complete integration and test of all the analog sensors and electronics. We summarize construction and assembly phases, Quality Control tests, calibration procedures and first tests performed in the assembly area, as well as the installation and commissioning plans of the final disks in the Mu2e hall.
", "doi": "10.1016/j.nima.2024.169959", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "2024-12", "volume": "1069", "pages": "169959" }, { "id": "authors:60914-pbm39", "collection": "authors", "collection_id": "60914-pbm39", "cite_using_url": "https://authors.library.caltech.edu/records/60914-pbm39", "type": "article", "title": "The Mu2e Digitizer ReAdout Controller (DiRAC): Characterization and radiation hardness", "author": [ { "family_name": "Atanov", "given_name": "N.", "orcid": "0000-0003-1744-5439" }, { "family_name": "Baranov", "given_name": "V." }, { "family_name": "Bloise", "given_name": "C.", "orcid": "0000-0002-1563-8969" }, { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-Leo-L" }, { "family_name": "Ceravolo", "given_name": "S.", "orcid": "0000-0002-7904-3112" }, { "family_name": "Cervelli", "given_name": "F.", "orcid": "0000-0001-9953-6240" }, { "family_name": "Colao", "given_name": "F.", "orcid": "0000-0003-0718-3068" }, { "family_name": "Cordelli", "given_name": "M.", "orcid": "0000-0002-6579-090X" }, { "family_name": "Corradi", "given_name": "G." }, { "family_name": "Davydov", "given_name": "Yu.I.", "orcid": "0000-0001-9833-2414" }, { "family_name": "Di Falco", "given_name": "S.", "orcid": "0000-0001-5425-8988" }, { "family_name": "Diociaiuti", "given_name": "E.", "orcid": "0000-0001-8248-2119" }, { "family_name": "Donati", "given_name": "S.", "orcid": "0000-0002-6212-5234" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Fedeli", "given_name": "P." }, { "family_name": "Ferrari", "given_name": "C." }, { "family_name": "Gioiosa", "given_name": "A.", "orcid": "0000-0003-2795-2602" }, { "family_name": "Giovannella", "given_name": "S.", "orcid": "0000-0002-6243-1215" }, { "family_name": "Giusti", "given_name": "V.", "orcid": "0000-0003-4318-6995" }, { "family_name": "Glagolev", "given_name": "V." }, { "family_name": "Hampai", "given_name": "D.", "orcid": "0000-0002-8881-0520" }, { "family_name": "Happacher", "given_name": "F.", "orcid": "0000-0002-5958-9003" }, { "family_name": "Hitlin", "given_name": "D.G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Martini", "given_name": "M.", "orcid": "0000-0001-9485-6384" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "S.", "orcid": "0000-0002-2182-0126" }, { "family_name": "Morescalchi", "given_name": "L.", "orcid": "0000-0002-7819-8139" }, { "family_name": "Paesani", "given_name": "D.", "orcid": "0000-0001-7015-533X" }, { "family_name": "Pasciuto", "given_name": "D.", "orcid": "0000-0001-8088-9716" }, { "family_name": "Pedreschi", "given_name": "E.", "orcid": "0000-0001-7631-3933" }, { "family_name": "Porter", "given_name": "F." }, { "family_name": "Raffaelli", "given_name": "F." }, { "family_name": "Saputi", "given_name": "A.", "orcid": "0000-0001-6067-7863" }, { "family_name": "Sarra", "given_name": "I.", "orcid": "0000-0002-5037-5316" }, { "family_name": "Spinella", "given_name": "F.", "orcid": "0000-0002-9607-7920" }, { "family_name": "Taffara", "given_name": "A." }, { "family_name": "Zhu", "given_name": "R.Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "The Mu2e experiment at Fermilab will search for the neutrino-less coherent conversion of a muon into an electron in the field of a nucleus. Mu2e detectors comprise a straw tracker, an electromagnetic calorimeter and a veto for cosmic rays. The calorimeter employs 1348 Cesium Iodide crystals readout by silicon photo-multipliers and fast front-end, and digitization electronics. The digitization board is named DiRAC (Digitizer ReAdout Controller) and 140 cards are needed for the readout of the full calorimeter. The DiRACs are hosted in crates located on the external surface of calorimeter disks, inside the detector solenoid cryostat and must sustain very high radiation and magnetic field so it was necessary to fully qualify it. Several version of prototypes were validated for operation in a high-vacuum (10−4 Torr) and under a 1T magnetic field. An extensive radiation hardness qualification campaign, carried out with photons, 14 MeV neutron beams, and 200 MeV protons, certified the DiRAC design to sustain doses up to 12 krad, neutron fluences up to ∼10111MeV neq/cm2, and very low occurrences of single-event effects. The qualification campaigns and quality assurance procedures will be reviewed.
", "doi": "10.1016/j.nima.2024.169688", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "2024-11", "volume": "1068", "pages": "169688" }, { "id": "authors:g43fj-mn350", "collection": "authors", "collection_id": "g43fj-mn350", "cite_using_url": "https://authors.library.caltech.edu/records/g43fj-mn350", "type": "article", "title": "Photon-rejection power of the Light Dark Matter eXperiment in an 8 GeV beam", "author": [ { "family_name": "\u00c5kesson", "given_name": "Torsten" }, { "family_name": "Bravo", "given_name": "Cameron" }, { "family_name": "Brennan", "given_name": "Liam" }, { "family_name": "Bryngemark", "given_name": "Lene Kristian", "orcid": "0000-0002-8420-3408" }, { "family_name": "Butti", "given_name": "Pierfrancesco" }, { "family_name": "Dukes", "given_name": "E. Craig" }, { "family_name": "Dutta", "given_name": "Valentina" }, { "family_name": "Echenard", "given_name": "Bertrand", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Eichlersmith", "given_name": "Thomas" }, { "family_name": "Eisch", "given_name": "Jonathan" }, { "family_name": "El\u00e9n", "given_name": "Einar" }, { "family_name": "Ehrlich", "given_name": "Ralf" }, { "family_name": "Froemming", "given_name": "Cooper" }, { "family_name": "Furmanski", "given_name": "Andrew" }, { "family_name": "Gogate", "given_name": "Niramay", "orcid": "0000-0002-7218-3323" }, { "family_name": "Grieco", "given_name": "Chiara", "orcid": "0000-0002-3955-4399" }, { "family_name": "Group", "given_name": "Craig" }, { "family_name": "Herde", "given_name": "Hannah", "orcid": "0000-0001-8926-6734" }, { "family_name": "Herwig", "given_name": "Christian", "orcid": "0000-0002-4280-6382" }, { "family_name": "Hitlin", "given_name": "David G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Horoho", "given_name": "Tyler", "orcid": "0000-0003-0117-4814" }, { "family_name": "Incandela", "given_name": "Joseph" }, { "family_name": "Ketchum", "given_name": "Wesley" }, { "family_name": "Krnjaic", "given_name": "Gordan", "orcid": "0000-0001-7420-9577" }, { "family_name": "Li", "given_name": "Amina" }, { "family_name": "Mans", "given_name": "Jeremiah" }, { "family_name": "Masterson", "given_name": "Phillip" }, { "family_name": "Middleton", "given_name": "Sophie", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Moreno", "given_name": "Omar" }, { "family_name": "Mullier", "given_name": "Geoffrey", "orcid": "0000-0001-6771-0937" }, { "family_name": "Muse", "given_name": "Joseph" }, { "family_name": "Nelson", "given_name": "Timothy" }, { "family_name": "O'Dwyer", "given_name": "Rory", "orcid": "0000-0003-0174-1786" }, { "family_name": "\u00d6stman", "given_name": "Leo" }, { "family_name": "Oyang", "given_name": "James", "orcid": "0000-0002-8019-3978", "clpid": "Oyang-James" }, { "family_name": "Pascadlo", "given_name": "Jessica", "orcid": "0009-0006-7686-2960" }, { "family_name": "P\u00f6ttgen", "given_name": "Ruth", "orcid": "0000-0002-3304-0987" }, { "family_name": "Sarmiento", "given_name": "Luis G.", "orcid": "0000-0001-7600-2772" }, { "family_name": "Schuster", "given_name": "Philip", "orcid": "0000-0002-6959-8974" }, { "family_name": "Solt", "given_name": "Matthew" }, { "family_name": "Suarez", "given_name": "Cristina Mantilla" }, { "family_name": "Tompkins", "given_name": "Lauren", "orcid": "0000-0001-8127-9653" }, { "family_name": "Toro", "given_name": "Natalia", "orcid": "0000-0002-8150-3990" }, { "family_name": "Tran", "given_name": "Nhan" }, { "family_name": "Wallin", "given_name": "Erik", "orcid": "0000-0002-4848-5540" }, { "family_name": "Whitbeck", "given_name": "Andrew" }, { "family_name": "Zhang", "given_name": "Danyi" }, { "literal": "The LDMX collaboration" } ], "abstract": "The Light Dark Matter eXperiment (LDMX) is an electron-beam fixed-target experiment designed to achieve comprehensive model independent sensitivity to dark matter particles in the sub-GeV mass region. An upgrade to the LCLS-II accelerator will increase the beam energy available to LDMX from 4 to 8 GeV. Using detailed GEANT4-based simulations, we investigate the effect of the increased beam energy on the capabilities to separate signal and background, and demonstrate that the veto methodology developed for 4 GeV successfully rejects photon-induced backgrounds for at least 2 × 1014 electrons on target at 8 GeV.
", "doi": "10.1007/jhep12(2023)092", "issn": "1029-8479", "publisher": "Springer Science and Business Media LLC", "publication": "Journal of High Energy Physics", "publication_date": "2023-12", "series_number": "12", "volume": "2023", "issue": "12", "pages": "92" }, { "id": "authors:6htr2-wad88", "collection": "authors", "collection_id": "6htr2-wad88", "cite_using_url": "https://authors.library.caltech.edu/records/6htr2-wad88", "type": "article", "title": "The Mu2e Crystal and SiPM Calorimeter: Construction Status", "author": [ { "family_name": "Atanov", "given_name": "Nikolay", "orcid": "0000-0003-1744-5439" }, { "family_name": "Baranov", "given_name": "Vladimir" }, { "family_name": "Borrel", "given_name": "Leo", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-Leo" }, { "family_name": "Bloise", "given_name": "Caterina" }, { "family_name": "Budagov", "given_name": "Julian" }, { "family_name": "Ceravolo", "given_name": "Sergio", "orcid": "0000-0002-7904-3112" }, { "family_name": "Cervelli", "given_name": "Franco" }, { "family_name": "Colao", "given_name": "Francesco" }, { "family_name": "Cordelli", "given_name": "Marco" }, { "family_name": "Corradi", "given_name": "Giovanni" }, { "family_name": "Davydov", "given_name": "Yuri", "orcid": "0000-0001-9833-2414" }, { "family_name": "Di Falco", "given_name": "Stefano" }, { "family_name": "Diociaiuti", "given_name": "Eleonora", "orcid": "0000-0001-8248-2119" }, { "family_name": "Donati", "given_name": "Simone" }, { "family_name": "Echenard", "given_name": "Bertrand", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Ferrari", "given_name": "Carlo" }, { "family_name": "Gargiulo", "given_name": "Ruben", "orcid": "0000-0001-7202-881X" }, { "family_name": "Gioiosa", "given_name": "Antonio", "orcid": "0000-0003-2795-2602" }, { "family_name": "Giovannella", "given_name": "Simona", "orcid": "0000-0002-6243-1215" }, { "family_name": "Giusti", "given_name": "Valerio", "orcid": "0000-0003-4318-6995" }, { "family_name": "Glagolev", "given_name": "Vladimir" }, { "family_name": "Grancagnolo", "given_name": "Francesco", "orcid": "0000-0002-9367-3380" }, { "family_name": "Hampai", "given_name": "Dariush", "orcid": "0000-0002-8881-0520" }, { "family_name": "Happacher", "given_name": "Fabio" }, { "family_name": "Hitlin", "given_name": "David", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Martini", "given_name": "Matteo", "orcid": "0000-0001-9485-6384" }, { "family_name": "Middleton", "given_name": "Sophie", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "Stefano", "orcid": "0000-0002-2182-0126" }, { "family_name": "Morescalchi", "given_name": "Luca" }, { "family_name": "Paesani", "given_name": "Daniele", "orcid": "0000-0001-7015-533X" }, { "family_name": "Pasciuto", "given_name": "Daniele", "orcid": "0000-0001-8088-9716" }, { "family_name": "Pedreschi", "given_name": "Elena" }, { "family_name": "Porter", "given_name": "Frank", "orcid": "0000-0003-1948-8889", "clpid": "Porter-F-C" }, { "family_name": "Raffaelli", "given_name": "Fabrizio" }, { "family_name": "Saputi", "given_name": "Alessandro", "orcid": "0000-0001-6067-7863" }, { "family_name": "Sarra", "given_name": "Ivano", "orcid": "0000-0002-5037-5316" }, { "family_name": "Spinella", "given_name": "Franco" }, { "family_name": "Taffara", "given_name": "Alessandra", "orcid": "0000-0002-6270-0518" }, { "family_name": "Zanetti", "given_name": "Anna Maria" }, { "family_name": "Zhu", "given_name": "Ren-Yuan", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" } ], "abstract": "The Mu2e experiment at Fermilab searches for the neutrino-less conversion of a negative muon into an electron, with a distinctive signature of a mono-energetic electron with an energy of 104.967 MeV. The calorimeter is made of two disks of pure CsI crystals, each read out by two custom large-area UV-extended silicon photomultipliers (SiPMs). It plays a fundamental role in providing excellent particle identification capabilities and an online trigger filter while improving the track reconstruction, requiring better than 10% energy and 500 ps timing resolutions for 100 MeV electrons. In this article, we present the status of construction and the quality control (QC) performed on the produced crystals and photosensors, the development of the rad-hard electronics, and the most important results of the irradiation tests. Construction of the mechanics is also reported. Status and plans for the calorimeter assembly and its first commissioning are described.
", "doi": "10.1109/tns.2023.3264757", "issn": "0018-9499", "publisher": "IEEE", "publication": "IEEE Transactions on Nuclear Science", "publication_date": "2023-07", "series_number": "7", "volume": "70", "issue": "7", "pages": "1281-1287" }, { "id": "authors:m9z2v-gaf12", "collection": "authors", "collection_id": "m9z2v-gaf12", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230627-116746000.12", "type": "article", "title": "Conceptual design of a Robotic Arm for the maintenance of the Read-Out Units of the Mu2e electromagnetic calorimeter", "author": [ { "family_name": "Atanov", "given_name": "N.", "orcid": "0000-0003-1744-5439", "clpid": "Atanov-Nicolay" }, { "family_name": "Baranov", "given_name": "V.", "clpid": "Baranov-V" }, { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-L\u00e9o-L" }, { "family_name": "Bloise", "given_name": "C.", "orcid": "0000-0002-1563-8969", "clpid": "Bloise-Caterina" }, { "family_name": "Budagov", "given_name": "J.", "clpid": "Budagov-J" }, { "family_name": "Ceravolo", "given_name": "S.", "orcid": "0000-0002-7904-3112", "clpid": "Ceravolo-Sergio" }, { "family_name": "Cervelli", "given_name": "F.", "orcid": "0000-0001-9953-6240", "clpid": "Cervelli-Franco" }, { "family_name": "Colao", "given_name": "F.", "clpid": "Colao-Francesco" }, { "family_name": "Cordelli", "given_name": "M.", "orcid": "0000-0002-6579-090X", "clpid": "Cordelli-Marco" }, { "family_name": "Davydov", "given_name": "Y. I.", "orcid": "0000-0001-9833-2414", "clpid": "Davydov-Yuri-I" }, { "family_name": "Di Falco", "given_name": "S.", "orcid": "0000-0001-5425-8988", "clpid": "Di-Falco-Stefano" }, { "family_name": "Diociaiuti", "given_name": "E.", "orcid": "0000-0001-8248-2119", "clpid": "Diociaiuti-Eleonora" }, { "family_name": "Donati", "given_name": "S.", "orcid": "0000-0002-6212-5234", "clpid": "Donati-Simone" }, { "family_name": "D'Agliano", "given_name": "A.", "orcid": "0000-0003-1382-0190", "clpid": "D'Agliano-Alessio" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Ferrari", "given_name": "C.", "orcid": "0000-0003-3807-5182", "clpid": "Ferrari-Carlo" }, { "family_name": "Gioiosa", "given_name": "A.", "orcid": "0000-0003-2795-2602", "clpid": "Gioiosa-Antonio" }, { "family_name": "Giovannella", "given_name": "S.", "orcid": "0000-0002-6243-1215", "clpid": "Giovannella-Simona" }, { "family_name": "Giusti", "given_name": "V.", "orcid": "0000-0003-4318-6995", "clpid": "Giusti-Valerio" }, { "family_name": "Glagolev", "given_name": "V.", "clpid": "Glagolev-V" }, { "family_name": "Hampai", "given_name": "D.", "orcid": "0000-0002-8881-0520", "clpid": "Hampai-Dariush" }, { "family_name": "Happacher", "given_name": "F.", "orcid": "0000-0002-5958-9003", "clpid": "Happacher-Fabio" }, { "family_name": "Hitlin", "given_name": "D. G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Lin", "given_name": "D. X.", "orcid": "0000-0003-2943-9343", "clpid": "Lin-Dexu" }, { "family_name": "Martini", "given_name": "M.", "orcid": "0000-0001-6508-2930", "clpid": "Martini-Manuele" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "S.", "orcid": "0000-0002-2182-0126", "clpid": "Miscetti-Stefano" }, { "family_name": "Morescalchi", "given_name": "L.", "orcid": "0000-0002-7819-8139", "clpid": "Morescalchi-Luca" }, { "family_name": "Paesani", "given_name": "D.", "orcid": "0000-0001-7015-533X", "clpid": "Paesani-Daniele" }, { "family_name": "Pasciuto", "given_name": "D.", "orcid": "0000-0001-8088-9716", "clpid": "Pasciuto-Daniele" }, { "family_name": "Pedreschi", "given_name": "E.", "orcid": "0000-0001-7631-3933", "clpid": "Pedreschi-Elena" }, { "family_name": "Porter", "given_name": "F. C.", "orcid": "0000-0003-1948-8889", "clpid": "Porter-F-C" }, { "family_name": "Raffaelli", "given_name": "F.", "orcid": "0000-0001-5266-6865", "clpid": "Raffaelli-Fabrizio" }, { "family_name": "Saputi", "given_name": "A.", "orcid": "0000-0001-6067-7863", "clpid": "Saputi-Alessandro" }, { "family_name": "Sarra", "given_name": "I.", "clpid": "Sarra-I" }, { "family_name": "Spinella", "given_name": "F.", "orcid": "0000-0002-9607-7920", "clpid": "Spinella-Franco" }, { "family_name": "Taffara", "given_name": "A.", "orcid": "0000-0002-6270-0518", "clpid": "Taffara-Alessandra" }, { "family_name": "Tassielli", "given_name": "G. F.", "orcid": "0000-0003-3410-6754", "clpid": "Tassielli-Giovanni-Francesco" }, { "family_name": "Tereshchenko", "given_name": "V.", "clpid": "Tereshchenko-V" }, { "family_name": "Usubov", "given_name": "Z.", "clpid": "Usubov-Z" }, { "family_name": "Vasilyev", "given_name": "I. I.", "clpid": "Vasilyev-I-I" }, { "family_name": "Zanetti", "given_name": "A.", "orcid": "0000-0003-4329-8727", "clpid": "Zanetti-Anna" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "Mu2e Collaboration" } ], "abstract": "The Calorimeter of the Mu2e experiment is a complicated detector made of crystal scintillators with dedicated read-out electronics per crystals. The compactness of the Front-End Units matrix, the complexity of the necessary services, and the limited space available after detector installation in the experimental hall make access, manipulation and maintenance of the Front-End Units very hard. This paper reports on the conceptual mechanical design of a robotic arm composed of a gantry structure for xyz positioning on the desired Front-End Unit and equipped with custom-designed grippers to perform the necessary maintenance operations. This includes the optimization of the Front-End Units cables routing.", "doi": "10.1016/j.nima.2022.167733", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "2023-01-11", "volume": "1046", "pages": "Art. No. 167733" }, { "id": "authors:7th3q-et392", "collection": "authors", "collection_id": "7th3q-et392", "cite_using_url": "https://authors.library.caltech.edu/records/7th3q-et392", "type": "article", "title": "Mu2e event visualization development using TEve and Eve-7", "author": [ { "family_name": "Chithirasreemadam", "given_name": "Namitha", "orcid": "0000-0001-6591-4311", "clpid": "Chithirasreemadam-Namitha" }, { "family_name": "Middleton", "given_name": "Sophie", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Donati", "given_name": "Simone", "orcid": "0000-0002-6212-5234" } ], "abstract": "The Mu2e experiment at Fermilab will search for the Charged Lepton Flavor Violating (CLFV) neutrinoless μ−N→e−N conversion in the field of an aluminum nucleus. A custom offline event display has been developed for Mu2e using TEve, a ROOT based 3-D event visualization framework. Event displays are crucial for monitoring and debugging during live data taking as well as for public outreach.
", "doi": "10.1016/j.nima.2022.167614", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "2023-01", "volume": "1045", "pages": "167614" }, { "id": "authors:awvmt-4w473", "collection": "authors", "collection_id": "awvmt-4w473", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230314-845495900.36", "type": "article", "title": "Mu2e Run I Sensitivity Projections for the Neutrinoless \u03bc\u2212 \u2192 e\u2212 Conversion Search in Aluminum", "author": [ { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-Leo" }, { "family_name": "Cheng", "given_name": "C.-H.", "orcid": "0000-0002-8382-0447", "clpid": "Cheng-Christine-H" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Flood", "given_name": "K.", "clpid": "Flood-Kevin-T" }, { "family_name": "Hitlin", "given_name": "D. G.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Kim", "given_name": "J.-H.", "clpid": "Kim-Joonhwi" }, { "family_name": "Li", "given_name": "Y.", "orcid": "0000-0001-9004-2471", "clpid": "Li-Yunxuan" }, { "family_name": "Lin", "given_name": "D.", "orcid": "0000-0003-2943-9343", "clpid": "Lin-Dexu" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miyashita", "given_name": "T.", "clpid": "Miyashita-Tomonari-S" }, { "family_name": "Oyang", "given_name": "J.", "clpid": "Oyang-James" }, { "family_name": "Porter", "given_name": "F.", "orcid": "0000-0003-1948-8889", "clpid": "Porter-F-C" }, { "family_name": "Roehrken", "given_name": "M.", "clpid": "R\u00f6hrken-Markus" }, { "family_name": "Trevor", "given_name": "J.", "clpid": "Trevor-J" }, { "family_name": "Zhu", "given_name": "R.-Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "Mu2e Collaboration" } ], "abstract": "The Mu2e experiment at Fermilab will search for the neutrinoless \u03bc\u207b \u2192 e\u207b conversion in the field of an aluminum nucleus. The Mu2e data-taking plan assumes two running periods, Run I and Run II, separated by an approximately two-year-long shutdown. This paper presents an estimate of the expected Mu2e Run I search sensitivity and includes a detailed discussion of the background sources, uncertainties of their prediction, analysis procedures, and the optimization of the experimental sensitivity. The expected Run I 5\u03c3 discovery sensitivity is R_(\u03bce) = 1.2 \u00d7 10\u207b\u00b9\u2075, with a total expected background of 0.11 \u00b1 0.03 events. In the absence of a signal, the expected upper limit is R_(\u03bce) < 6.2 \u00d7 10\u207b\u00b9\u2076 at 90% CL. This represents a three order of magnitude improvement over the current experimental limit of R_(\u03bce) < 7 \u00d7 10\u207b\u00b9\u00b3 at 90% CL set by the SINDRUM II experiment.", "doi": "10.3390/universe9010054", "issn": "2218-1997", "publisher": "MDPI", "publication": "Universe", "publication_date": "2023-01", "series_number": "1", "volume": "9", "issue": "1", "pages": "Art. No. 54" }, { "id": "authors:zbhjz-65r57", "collection": "authors", "collection_id": "zbhjz-65r57", "cite_using_url": "https://authors.library.caltech.edu/records/zbhjz-65r57", "type": "article", "title": "Development and construction status of the Mu2e electromagnetic calorimeter mechanical structures", "author": [ { "family_name": "Atanov", "given_name": "N.", "orcid": "0000-0003-1744-5439" }, { "family_name": "Baranov", "given_name": "V." }, { "family_name": "Borrel", "given_name": "L.", "orcid": "0000-0003-1436-1248", "clpid": "Borrel-L\u00e9o" }, { "family_name": "Bloise", "given_name": "C.", "orcid": "0000-0002-1563-8969" }, { "family_name": "Budagov", "given_name": "J." }, { "family_name": "Ceravolo", "given_name": "S.", "orcid": "0000-0002-7904-3112" }, { "family_name": "Cervelli", "given_name": "F.", "orcid": "0000-0001-9953-6240" }, { "family_name": "Colao", "given_name": "F.", "orcid": "0000-0003-0718-3068" }, { "family_name": "Cordelli", "given_name": "M.", "orcid": "0000-0002-6579-090X" }, { "family_name": "Corradi", "given_name": "G." }, { "family_name": "Davydov", "given_name": "Y. I.", "orcid": "0000-0001-9833-2414" }, { "family_name": "Di Falco", "given_name": "S.", "orcid": "0000-0001-5425-8988" }, { "family_name": "Diociaiuti", "given_name": "E.", "orcid": "0000-0001-8248-2119" }, { "family_name": "Donati", "given_name": "S.", "orcid": "0000-0002-6212-5234" }, { "family_name": "Echenard", "given_name": "B.", "orcid": "0000-0002-3866-9370", "clpid": "Echenard-Bertrand" }, { "family_name": "Ferrari", "given_name": "C." }, { "family_name": "Gioiosa", "given_name": "A.", "orcid": "0000-0003-2795-2602" }, { "family_name": "Giovannella", "given_name": "S.", "orcid": "0000-0002-6243-1215" }, { "family_name": "Giusti", "given_name": "V.", "orcid": "0000-0003-4318-6995" }, { "family_name": "Glagolev", "given_name": "V." }, { "family_name": "Grancagnolo", "given_name": "F." }, { "family_name": "Hampai", "given_name": "D.", "orcid": "0000-0002-8881-0520" }, { "family_name": "Happacher", "given_name": "F.", "orcid": "0000-0002-5958-9003" }, { "family_name": "Hitlin", "given_name": "D.", "orcid": "0000-0003-4028-6982", "clpid": "Hitlin-D-G" }, { "family_name": "Lin", "given_name": "D.", "orcid": "0000-0003-2943-9343", "clpid": "Lin-Dexu" }, { "family_name": "Martini", "given_name": "M.", "orcid": "0000-0001-9485-6384" }, { "family_name": "Middleton", "given_name": "S.", "orcid": "0000-0003-3380-5908", "clpid": "Middleton-Sophie" }, { "family_name": "Miscetti", "given_name": "S.", "orcid": "0000-0002-2182-0126" }, { "family_name": "Morescalchi", "given_name": "L.", "orcid": "0000-0002-7819-8139" }, { "family_name": "Paesani", "given_name": "D.", "orcid": "0000-0001-7015-533X" }, { "family_name": "Pasciuto", "given_name": "D.", "orcid": "0000-0001-8088-9716" }, { "family_name": "Pedreschi", "given_name": "E.", "orcid": "0000-0001-7631-3933" }, { "family_name": "Porter", "given_name": "F.", "orcid": "0000-0003-1948-8889", "clpid": "Porter-Frank-C" }, { "family_name": "Raffaelli", "given_name": "F." }, { "family_name": "Saputi", "given_name": "A.", "orcid": "0000-0001-6067-7863" }, { "family_name": "Sarra", "given_name": "I.", "orcid": "0000-0002-5037-5316" }, { "family_name": "Spinella", "given_name": "F.", "orcid": "0000-0002-9607-7920" }, { "family_name": "Taffara", "given_name": "A.", "orcid": "0000-0002-6270-0518" }, { "family_name": "Tassielli", "given_name": "G. F.", "orcid": "0000-0003-3410-6754" }, { "family_name": "Tereshchenko", "given_name": "V." }, { "family_name": "Usubov", "given_name": "Z." }, { "family_name": "Vasilyev", "given_name": "I. I." }, { "family_name": "Zanetti", "given_name": "A.", "orcid": "0000-0003-4329-8727" }, { "family_name": "Zhu", "given_name": "R. Y.", "orcid": "0000-0003-3091-7461", "clpid": "Zhu-Ren-Yuan" }, { "literal": "Mu2e Collaboration" } ], "abstract": "The Mu2e experiment at Fermilab will search for the CLFV neutrino-less coherent conversion of a muon into an electron in the field of an aluminum nucleus. The observation of this process would be the evidence of physics beyond the Standard Model. Mu2e comprises a straw-tracker, an electromagnetic calorimeter and an external veto for cosmic rays. The calorimeter provides electron identification, a fast trigger and aids track reconstruction. It is a state-of-the-art crystal calorimeter and employs 1340 pure CsI crystals readout by UV-extended SiPM and fast electronics. The design consists of two identical annular disks positioned at the relative distance of 70 cm downstream the target.The hostile Mu2e conditions (total ionizing dose of 12 krad and a neutron fluence of 5 × 1010 n/cm2 @ 1 MeVeq (Si)/y, 1 T magnetic field and vacuum level of 10−4 Torr) posed tight constraints on the mechanical structures and materials choice. The support structure of the two crystal matrices employs two aluminum hollow rings and parts made of open-cell vacuum-compatible carbon fiber. SiPMs and front-end electronics for each crystal are assembled in one mechanical unit inserted in a machined copper holder. The units are supported by a plate made of vacuum-compatible material. The plate integrates the cooling system made of a network of copper lines flowing a low temperature fluid and placed in thermal contact with the copper holders. The DAQ is hosted in aluminum crates positioned on the lateral surface of the disks. The crates also integrate the DAQ electronics cooling system. We review the constraints on the calorimeter structures design, the development of all the structural components, including the simulations that have determined the materials and technological choices and the specifications of the cooling station, components production and quality assurance tests, the procedures for detector assembly, transportation and installation in the experimental area.
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