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Autori principali: Campagnari, Claudio, Cho, Sungwoong, Choi, Suyong, Chung, Seokju, Citron, Matthew, Santos, Ryan De Los, De Roeck, Albert, Gastal, Martin, Ha, Seungkyu, Haas, Andy, Hill, Christopher Scott, Hong, Byeong Jin, Hwang, Haeyun, Hwang, Insung, Jeong, Hoyong, Kim, Minseo, Moon, Hyunki, Padmanaban, Jayashri, Schmitz, Ryan, Seo, Changhyun, Stuart, David, Vargas, Juan Salvador Tafoya, Won, Eunil, Yoo, Jae Hyeok, Yoo, Jinseok, Youssef, Ayman, Zaraket, Ahmad, Zaraket, Haitham, Zheng, Collin
Natura: Preprint
Pubblicazione: 2025
Soggetti:
Instrumentation and Detectors
High Energy Physics - Experiment
Accesso online:https://arxiv.org/abs/2510.19724
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Sommario:
  • The SUB-Millicharge ExperimenT (SUBMET) investigates an unexplored parameter space of millicharged particles with mass $m_χ< $ 1.6 GeV/c$^2$ and charge $Q_χ< 10^{-3}e$. The detector consists of an Eljen-200 plastic scintillator coupled to a Hamamatsu Photonics R7725 photomultiplier tube (PMT). PMT afterpulses, delayed pulses produced after an energetic pulse, have been observed in the SUBMET readout system, especially following primary pulses with a large area. We present a prediction method for afterpulse rates based on measurable parameters, which reproduces the observed rate with approximately 20\% precision. This approach enables a better understanding of afterpulse contributions and, consequently, improves the reliability of background predictions.

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