The Mu2e Crystal Calorimeter: An Overview
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Published:2022-10-09
Issue:4
Volume:6
Page:60
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ISSN:2410-390X
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Container-title:Instruments
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language:en
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Short-container-title:Instruments
Author:
Atanov Nikolay, Baranov Vladimir, Borrel Leo, Bloise Caterina, Budagov Julian, Ceravolo Sergio, Cervelli Franco, Colao Francesco, Cordelli Marco, Corradi Giovanni, Davydov Yuri, Falco Stefano Di, Diociaiuti Eleonora, Donati Simone, Echenard Bertrand, Ferrari Carlo, Gioiosa Antonio, Giovannella Simona, Giusti Valerio, Glagolev Vladimir, Grancagnolo Francesco, Hampai Dariush, Happacher Fabio, Hitlin David, Martini Matteo, Middleton Sophie, Miscetti StefanoORCID, Morescalchi Luca, Paesani Daniele, Pasciuto Daniele, Pedreschi Elena, Porter Frank, Raffaelli Fabrizio, Saputi Alessandro, Sarra Ivano, Spinella Franco, Taffara Alessandra, Zanetti Anna Maria, Zhu Ren Yuan
Abstract
The Mu2e experiment at Fermilab will search for the standard model-forbidden, charged lepton flavour-violating conversion of a negative muon into an electron in the field of an aluminium nucleus. The distinctive signal signature is represented by a mono-energetic electron with an energy near the muon’s rest mass. The experiment aims to improve the current single-event sensitivity by four orders of magnitude by means of a high-intensity pulsed muon beam and a high-precision tracking system. The electromagnetic calorimeter complements the tracker by providing high rejection power in muon to electron identification and a seed for track reconstruction while working in vacuum in presence of a 1 T axial magnetic field and in a harsh radiation environment. For 100 MeV electrons, the calorimeter should achieve: (a) a time resolution better than 0.5 ns, (b) an energy resolution <10%, and (c) a position resolution of 1 cm. The calorimeter design consists of two disks, each loaded with 674 undoped CsI crystals read out by two large-area arrays of UV-extended SiPMs and custom analogue and digital electronics. We describe here the status of construction for all calorimeter components and the performance measurements conducted on the large-sized prototype with electron beams and minimum ionizing particles at a cosmic ray test stand. A discussion of the calorimeter’s engineering aspects and the on-going assembly is also reported.
Reference19 articles.
1. The Mu2e Collaboration. Mu2e technical design report;Bartoszek;arXiv,2015 2. Lepton mixing, μ → e + γ decay and neutrino oscillations 3. On the search for μ→ e conversion on Nuclei;Lobashev;Sov. J. Nucl. Phys.,1989 4. Mu2e Collaboration. The straw tube tracker for the Mu2e experiment;Lee;Nucl. Phys. B Proc. Suppl.,2016 5. Design and Status of the Mu2e Crystal Calorimeter
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