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Beam particle tracking with a low-mass mini time projection chamber in the PEN experiment
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Beam particle tracking with a low-mass mini time projection chamber in the PEN experiment
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Paper
Beam particle tracking with a low-mass mini time projection chamber in the PEN experiment
2021
Overview
The international PEN collaboration aims to obtain the branching ratio for the pion electronic decay \\(\\pi^+ \\to e^+\\nu_e(\\gamma)\\), aka \\(\\pi_{e2}\\), to a relative precision of \\(5\\times 10^{-4}\\) or better. The PEN apparatus comprises a number of detection systems, all contributing vital information to the PEN event reconstruction. This paper discusses the design, performance, and Monte Carlo simulation of the mini time projection chamber (mTPC) used for pion, muon, and positron beam particle tracking. We also review the use of the extracted trajectory coordinates in the analysis, in particular in constructing observables critical for discriminating background processes, and in maximizing the fiducial volume of the target in which decay event vertices can be accepted for branching ratio extraction without introducing bias.
Publisher
Cornell University Library, arXiv.org
Subject
