Muon reconstruction in the Daya Bay water pools

Hackenburg, R. W.

doi:10.1016/j.nima.2017.08.002

Title: Muon reconstruction in the Daya Bay water pools

Journal Article · Sat Aug 12 00:00:00 EDT 2017 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2017.08.002· OSTI ID:1376167

Hackenburg, R. W. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

Muon reconstruction in the Daya Bay water pools would serve to verify the simulated muon fluxes and offer the possibility of studying cosmic muons in general. This reconstruction is, however, complicated by many optical obstacles and the small coverage of photomultiplier tubes (PMTs) as compared to other large water Cherenkov detectors. The PMTs’ timing information is useful only in the case of direct, unreflected Cherenkov light. This requires PMTs to be added and removed as an hypothesized muon trajectory is iteratively improved, to account for the changing effects of obstacles and direction of light. Therefore, muon reconstruction in the Daya Bay water pools does not lend itself to a general fitting procedure employing smoothly varying functions with continuous derivatives. Here, we describe an algorithm which overcomes these complications. It employs the method of Least Mean Squares to determine an hypothesized trajectory from the PMTs’ charge-weighted positions. This initially hypothesized trajectory is then iteratively refined using the PMTs’ timing information. Reconstructions with simulated data reproduce the simulated trajectory to within about 5° in direction and about 45 cm in position at the pool surface, with a bias that tends to pull tracks away from the vertical by about 3°.

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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:: SC0012704; AC02-98CH10886

OSTI ID:: 1376167

Alternate ID(s):: OSTI ID: 1549877

Report Number(s):: BNL-114139-2017-JA; R&D Project: PO-022; KA2201020; TRN: US1702567

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 872, Issue C; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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References (8)

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Cited By (2)

Physics with Reactor Neutrinos Qian, Xin; Peng, Jen-Chieh arXiv https://doi.org/10.48550/arxiv.1801.05386	text	January 2018
Physics with reactor neutrinos Qian, Xin; Peng, Jen-Chieh Reports on Progress in Physics, Vol. 82, Issue 3 https://doi.org/10.1088/1361-6633/aae881	journal	February 2019

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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