LANSCE-mQ: Dedicated search for milli/fractionally charged particles at LANL
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2024
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| author | Tsai, Yu-Dai Hwang, Insung Schmitz, Ryan Citron, Matthew Gunthoti, Kranti Steenis, Jacob Jeong, Hoyong Moon, Hyunki Yoo, Jae Hyeok Liu, Ming Xiong |
| author_facet | Tsai, Yu-Dai Hwang, Insung Schmitz, Ryan Citron, Matthew Gunthoti, Kranti Steenis, Jacob Jeong, Hoyong Moon, Hyunki Yoo, Jae Hyeok Liu, Ming Xiong |
| contents | In this paper, we propose an experiment, LANSCE-mQ, aiming to detect fractionally charged and millicharged particles (mCP) using an 800 MeV proton beam fixed target at the Los Alamos Neutron Science Center (LANSCE) facility. This search can shed new light on numerous fundamental questions, including charge quantization, the predictions of string theories and grand unification theories, the gauge symmetry of the Standard Model, dark sector models, and the tests of cosmic reheating. We propose to install two-layer scintillation detectors made of plastic (such as EJ-200) or CeBr3 to search for mCPs. Dedicated Geant4 detector simulations and in situ measurements have been conducted to obtain a preliminary determination of the background rate. The dominant backgrounds are beam-induced neutrons and coincident dark current signals from the photomultiplier tubes, while beam-induced gammas and cosmic muons are subdominant. We determined that LANSCE-mQ, the dedicated mCP experiment, has the leading mCP sensitivity for mass between ~ 1 MeV to 300 MeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_07142 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | LANSCE-mQ: Dedicated search for milli/fractionally charged particles at LANL Tsai, Yu-Dai Hwang, Insung Schmitz, Ryan Citron, Matthew Gunthoti, Kranti Steenis, Jacob Jeong, Hoyong Moon, Hyunki Yoo, Jae Hyeok Liu, Ming Xiong High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment High Energy Physics - Theory In this paper, we propose an experiment, LANSCE-mQ, aiming to detect fractionally charged and millicharged particles (mCP) using an 800 MeV proton beam fixed target at the Los Alamos Neutron Science Center (LANSCE) facility. This search can shed new light on numerous fundamental questions, including charge quantization, the predictions of string theories and grand unification theories, the gauge symmetry of the Standard Model, dark sector models, and the tests of cosmic reheating. We propose to install two-layer scintillation detectors made of plastic (such as EJ-200) or CeBr3 to search for mCPs. Dedicated Geant4 detector simulations and in situ measurements have been conducted to obtain a preliminary determination of the background rate. The dominant backgrounds are beam-induced neutrons and coincident dark current signals from the photomultiplier tubes, while beam-induced gammas and cosmic muons are subdominant. We determined that LANSCE-mQ, the dedicated mCP experiment, has the leading mCP sensitivity for mass between ~ 1 MeV to 300 MeV. |
| title | LANSCE-mQ: Dedicated search for milli/fractionally charged particles at LANL |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment High Energy Physics - Theory |
| url | https://arxiv.org/abs/2407.07142 |