Abstract
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,
$$ \int dt\ \mathcal{L}=50\ {\mathrm{ab}}^{-1} $$
∫
dt
L
=
50
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 (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.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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