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Journal of High Energy Physics

, 2019:168 | Cite as

Search for muon-philic new light gauge boson at Belle II

  • Yongsoo Jho
  • Youngjoon Kwon
  • Seong Chan ParkEmail author
  • Po-Yan Tseng
Open Access
Regular Article - Theoretical Physics

Abstract

Motivated by the long-lasting 3.5σ discrepancy in the anomalous magnetic moment of muon, we consider a new muon-specific force mediated by a light gauge boson, X, with mass mX < 2mμ and the coupling constant gX ∼ (10−4, 10−3) . We show that the Belle II experiment has a robust chance to probe such a light boson in e+e → μ+μ + X channel and cover the most interesting parameter space explaining the discrepancy with the planned target luminosity, \( \int dt\ \mathcal{L}=50\ {\mathrm{ab}}^{-1} \). The clean signal of muon-pair plus missing energy at Belle II can be a smoking gun for the new gauge boson. We expect that the (invisibly decaying) muon-philic light (mX ≲ 2mμ) gauge boson can be probed down to gX ≲ 1.5 × 10−4(4.6 × 10−4,  2.3 × 10−4) for 50 (1, 10) ab−1 search.

Keywords

Beyond Standard Model Gauge Symmetry 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Department of Physics and IPAPYonsei UniversitySeoulRepublic of Korea
  2. 2.Kavli IPMU (WPI), UTIASThe University of TokyoChibaJapan

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