Detector for measuring the π+ → e+v branching fraction

Aguilar-Arevalo, A. A.; Aoki, M.; Blecher, M.; Bruch, D. vom; Bryman, D.; Comfort, J.; Cuen-Rochin, S.; Doria, L.; Gumplinger, P.; Hussein, A.; Igarashi, Y.; Ito, N.; Ito, S.; Kettell, S. H.; Kurchaninov, L.; Littenberg, L.; Malbrunot, C.; Mischke, R. E.; Muroi, A.; Numao, T.; Sheffer, G.; Sher, A.; Sullivan, T.; Tauchi, K.; Vavilov, D.; Yamada, K.; Yoshida, M.

doi:10.1016/j.nima.2015.04.004

Title: Detector for measuring the π⁺ → e⁺v branching fraction

Journal Article · Mon Apr 13 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.2015.04.004· OSTI ID:1210167

Aguilar-Arevalo, A. A. ^[1]; Aoki, M. ^[2]; Blecher, M. ^[3]; Bruch, D. vom ^[4]; Bryman, D. ^[4]; Comfort, J. ^[5]; Cuen-Rochin, S. ^[4]; Doria, L. ^[6]; Gumplinger, P. ^[6]; Hussein, A. ^[7]; Igarashi, Y. ^[8]; Ito, N. ^[2]; Ito, S. ^[2]; Kettell, S. H. ^[9]; Kurchaninov, L. ^[6]; Littenberg, L. ^[9]; Malbrunot, C. ^[4]; Mischke, R. E. ^[6]; Muroi, A. ^[2]; Numao, T. ^[6] more »

Universidad Nacional Autonoma de Mexico (Mexico). Inst. de Ciencias Nucleares
Osaka Univ. (Japan). Graduate School of Science
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
Arizona State Univ., Tempe, AZ (United States)
TRIUMF, Vancouver, BC (Canada)
Univ. of Northern British Columbia, Prince George, BC (Canada)
National Lab. for High Energy Physics (KEK), Tsukuba (Japan)
Brookhaven National Lab. (BNL), Upton, NY (United States)

The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio R^e/u = Γ((π⁺ → e⁺v_e) + (π⁺ → e⁺v_eγ))/Γ((π⁺ → μ⁺v_μ) + (π⁺ → μ⁺v_μγ)) with precision < 0.1%. Incident pions, delivered at the rate of 60 kHz with momentum 75 MeV/c, were degraded and stopped in a plastic scintillator target. Pions and their decay product positrons were detected with plastic scintillators and tracked with multiwire proportional chambers and silicon strip detectors. The energies of the positrons were measured in a spectrometer consisting of a large NaI(Tℓ) crystal surrounded by an array of pure CsI crystals. This paper provides a description of the PIENU experimental apparatus and its performance in pursuit of R^e/u

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: 18540274; 21340059; 24224006

OSTI ID:: 1210167

Report Number(s):: BNL-108201-2015-JA; R&D Project: PO-022; KA2201020; TRN: US1600721

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 791, Issue C; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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References (19)

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