183 research outputs found

    Discovering True Muonium at LHCb

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    We study the potential of the LHCb experiment to discover, for the first time, the μ+μ\mu^+\mu^- true muonium bound state. We propose a search for the vector 13S11^3S_1 state, T ⁣M\mathcal{T\!M}, which kinetically mixes with the photon and dominantly decays to e+ee^+e^-. We demonstrate that a search for ηγT ⁣M\eta \to \gamma \mathcal{T\!M}, T ⁣Me+e\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+ee^+e^- vertex, and an exclusive search which requires an additional photon and a reconstruction of the η\eta mass.Comment: 12 pages, 5 figures; v2: edits from comments and review, matched to PRD versio
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