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

Yongsoo Jho, Youngjoon Kwon, Seong Chan Park, Po Yan Tseng

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


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, ∫dtL=50ab−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.

Original languageEnglish
Article number168
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 2019 Oct 1

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


Dive into the research topics of 'Search for muon-philic new light gauge boson at Belle II'. Together they form a unique fingerprint.

Cite this