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

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

doi:10.1007/JHEP10(2019)168

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

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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 m_X < 2m_μ 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 (m_X ≲ 2m_μ) gauge boson can be probed down to g_X ≲ 1.5 × 10⁻⁴(4.6 × 10⁻⁴, 2.3 × 10⁻⁴) for 50 (1, 10) ab⁻¹ search.

Original language	English
Article number	168
Journal	Journal of High Energy Physics
Volume	2019
Issue number	10
DOIs	https://doi.org/10.1007/JHEP10(2019)168
Publication status	Published - 2019 Oct 1

Bibliographical note

Funding Information:
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

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

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1007/JHEP10(2019)168

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title = "Search for muon-philic new light gauge boson at Belle II",

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, ∫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.",

author = "Yongsoo Jho and Youngjoon Kwon and Park, {Seong Chan} and Tseng, {Po Yan}",

note = "Funding Information: 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 Publisher Copyright: {\textcopyright} 2019, The Author(s).",

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AU - Park, Seong Chan

AU - Tseng, Po Yan

N1 - Funding Information: 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 Publisher Copyright: © 2019, The Author(s).

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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.

AB - 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.

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

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