Design and status of the Mu2e electromagnetic calorimeter

Journal Article · Fri Oct 02 00:00:00 EDT 2015 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2015.09.074· OSTI ID:1323369

Atanov, N. ^[1]; Baranov, V. ^[1]; Budagov, J. ^[1]; Carosi, R. ^[2]; Cervelli, F. ^[2]; Colao, F. ^[3]; Cordelli, M. ^[3]; Corradi, G. ^[3]; Dane, E. ^[3]; Davydov, Yu. I. ^[1]; Di Falco, S. ^[2]; Donati, S. ^[4]; Donghia, R. ^[5]; Echenard, B. ^[6]; Flood, K. ^[6]; Giovannella, S. ^[3]; Glagolev, V. ^[1]; Grancagnolo, F. ^[7]; Happacher, F. ^[3]; Hitlin, D. G. ^[6] ; Martini, M. ^[8]; Miscetti, Stefano  ^[3]; Miyashita, T. ^[6]; Morescalchi, L. ^[9]; Murat, P. ^[10]; Pasciuto, D. ^[11]; Pezzullo, G. ^[11]; Porter, F. ^[6]; Saputi, A. ^[3]; Sarra, I. ^[3]; Soleti, S. R. ^[3]; Spinella, F. ^[2]; Tassielli, G. ^[7]; Tereshchenko, V. ^[1]; Usubov, Z. ^[1]; Zhu, R. Y. ^[6]

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1. Joint Institute for Nuclear Research, Dubna (Russia)
2. INFN Sezione di Pisa, Pisa (Italy)
3. Lab. Nazionali di Frascati dell INFN, Frascati (Italy)
4. INFN Sezione di Pisa, Pisa (Italy); Univ. de Pisa, Pisa (Italy)
5. Lab. Nazionali di Frascati dell INFN, Frascati (Italy); Univ. degli studi Roma Tre, Roma (Italy)
6. California Inst. of Technology (CalTech), Pasadena, CA (United States)
7. INFN Sezione di Lecce, Lecce (Italy)
8. Lab. Nazionali di Frascati dell INFN, Frascati (Italy); Univ. "Guglielmo Marconi", Roma (Italy)
9. INFN Sezione de Pisa, Pisa (Italy); Univ. di Siena, Siena (Italy)
10. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
11. INFN Sezione de Pisa, Pisa (Italy); Univ. do Pisa, Pisa (Italy)

Here, the Mu2e experiment at Fermilab aims at measuring the neutrinoless conversion of a negative muon into an electron and reach a single event sensitivity of 2.5×10^–17 after three years of data taking. The monoenergetic electron produced in the final state, is detected by a high precision tracker and a crystal calorimeter, all embedded in a large superconducting solenoid (SD) surrounded by a cosmic ray veto system. The calorimeter is complementary to the tracker, allowing an independent trigger and powerful particle identification, while seeding the track reconstruction and contributing to remove background tracks mimicking the signal. In order to match these requirements, the calorimeter should have an energy resolution of O(5)% and a time resolution better than 500 ps at 100 MeV. The baseline solution is a calorimeter composed of two disks of BaF₂ crystals read by UV extended, solar blind, Avalanche Photodiode (APDs), which are under development from a JPL, Caltech, RMD consortium. In this paper, the calorimeter design, the R&D; studies carried out so far and the status of engineering are described. A backup alternative setup consisting of a pure CsI crystal matrix read by UV extended Hamamatsu MPPC's is also presented.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1323369
• Report Number(s): FERMILAB-CONF-16-316-E; arXiv:1608.02652; 1480186
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 824, Issue C; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

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