Search for new light vector boson using $J/\Psi$ at BESIII and Belle II
| Autor: | Kayoung Ban, Yongsoo Jho, Youngjoon Kwon, Po Yan Tseng, Seokhee Park, Seong Chan Park |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics Signal region QC770-798 Coupling (probability) 01 natural sciences Vector boson Luminosity Vertex (geometry) High Energy Physics - Experiment High Energy Physics - Phenomenology Gauge Symmetry Nuclear and particle physics. Atomic energy. Radioactivity 0103 physical sciences Beyond Standard Model Production (computer science) High Energy Physics::Experiment Anomaly (physics) 010306 general physics Gauge symmetry |
| Zdroj: | Journal of High Energy Physics, Vol 2021, Iss 4, Pp 1-17 (2021) Journal of High Energy Physics |
| Popis: | We investigate various search strategies for light vector boson $X$ in $\mathcal{O}(10)~{\rm MeV}$ mass range using $J/\Psi$ associated channels at BESIII and Belle II: (i) $J/\Psi \to \eta_c X$ with $10^{10} J/\Psi$s at BESIII, (ii) $J/\Psi (\eta_c +X) +\ell \bar{\ell}$ production at Belle~II, and (iii) $J/\Psi +X$ with the displaced vertex in $X\to e^+e^-$ decay are analyzed and the future sensitivities at Belle II with 50 ${\rm ab}^{-1}$ luminosity are comprehensively studied. By requiring the displaced vertex to be within the beam pipe, the third method results in nearly background-free analysis, and the vector boson-electron coupling and the vector boson mass can be probed in the unprecedented range, $10^{-4}\leq |\varepsilon_e| \leq 10^{-3}$ and $9~{\rm MeV}\leq m_X\leq 100 {\rm MeV}$ with 50 ${\rm ab}^{-1}$ at Belle II. This covers the favored signal region of $^8{\rm Be}^*$ anomaly recently reported by Atomki experiment with $m_X \simeq 17~{\rm MeV}$. Comment: 16 pages, 8 figures, and 6 tables |
| Databáze: | OpenAIRE |
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