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Discovering True Muonium at LHCb

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arxiv 1904.08458 v2 pith:DJ463L3L submitted 2019-04-17 hep-ph hep-ex

classification hep-phhep-ex
keywords searchmathcallhcbmuoniumphotonstatetruevertex
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We study the potential of the LHCb experiment to discover, for the first time, the $\mu^+\mu^-$ true muonium bound state. We propose a search for the vector $1^3S_1$ state, $\mathcal{T\!M}$, which kinetically mixes with the photon and dominantly decays to $e^+e^-$. We demonstrate that a search for $\eta \to \gamma \mathcal{T\!M}$, $\mathcal{T\!M}\to e^+e^-$ in a displaced vertex can exceed a significance of 5 standard deviations assuming statistical uncertainties. We present two possible searches: an inclusive search for the $e^+e^-$ vertex, and an exclusive search which requires an additional photon and a reconstruction of the $\eta$ mass.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Lepton flavor violating decay of true muonium: $\boldsymbol{(\mu^+ \mu^-) \to \mu^\pm e^\mp}$

    hep-ph 2025-07 conditional novelty 6.0 of 10

    True muonium could decay into a muon and an electron with branching ratio up to 10^-20, giving a new probe of charged lepton flavor violation.

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