Measurements of the branching fraction ratio B ϕ → μ + μ − / B ϕ → e + e − $B (ϕ \to μ^{+} μ^{-}) / B (ϕ \to e^{+} e^{-})$ with charm meson decays

The LHCb collaboration,R. Aaij，D. Zuliani,G. Zunica

Journal of High Energy Physics（2024）

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Abstract

Abstract Measurements of the branching fraction ratio B ϕ → μ + μ − / B ϕ → e + e −

B (ϕ \to μ^{+} μ^{-}) / B (ϕ \to e^{+} e^{-})

with D s + → π + ϕ

D_{s}^{+} \to π^{+} ϕ

and D + → π + ϕ decays, denoted R ϕπ s

R_{ϕ π}^{s}

and R ϕπ d

R_{ϕ π}^{d}

, are presented. The analysis is performed using a dataset corresponding to an integrated luminosity of 5.4 fb −1 of pp collision data collected with the LHCb experiment. The branching fractions are normalised with respect to the B + → K + J/ψ(→ e + e − ) and B + → K + J/ψ(→ μ + μ − ) decay modes. The combination of the results yields R ϕπ = 1.022 ± 0.012 stat ± 0.048 syst .

R_{ϕ π} = 1.022 \pm 0.012 (stat) \pm 0.048 (syst) .

The result is compatible with previous measurements of the ϕ → ℓ + ℓ − branching fractions and predictions based on the Standard Model.

Translated text

Key words

B Physics,Branching fraction,Charm Physics,Hadron-Hadron Scattering

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【要点】：本文通过LHCb实验测量了D_s^+ → π^+ ϕ和D^+ → π^+ ϕ衰变中φ介子到μ^+μ^-与e^+e^-分支比，得到R_φπ = 1.022 ± 0.012 stat ± 0.048 syst，与标准模型预测相符，为标准模型提供了新的验证数据。
【方法】：研究利用D_s^+ → π^+ ϕ和D^+ → π^+ ϕ衰变模式，通过比较φ介子到μ^+μ^-与e^+e^-的分支比，结合B^+ → K^+ J/ψ(→ e^+e^-)和B^+ → K^+ J/ψ(→ μ^+μ^-)衰变模式进行归一化处理。
【实验】：实验使用LHCb实验收集的5.4 fb^-1积分亮度的pp碰撞数据，通过数据分析得到R_φπ的测量结果。

Measurements of the branching fraction ratio B ϕ → μ + μ − / B ϕ → e + e − B(ϕ→μ+μ−)/B(ϕ→e+e−) with charm meson decays

Measurements of the branching fraction ratio B ϕ → μ + μ − / B ϕ → e + e − $B (ϕ \to μ^{+} μ^{-}) / B (ϕ \to e^{+} e^{-})$ with charm meson decays