Test of Lepton Flavor Universality with B s 0 → ϕ ℓ + ℓ − Decays

2024/10/17 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1144 · 1 voice
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.134.121803

openalex publication_date 2025/03/27 · openalex created_date 2025/03/28 · openalex updated_date 2026/08/01

Abstract

Lepton flavor universality in rare b→s transitions is tested for the first time using B_s⁰ meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^-1. Branching fraction ratios between the B_s⁰→ϕe⁺e^- and B_s⁰→ϕμ⁺μ^- decays are measured in three regions of dilepton mass squared, q², with 0.1<q²<1.1, 1.1<q²<6.0, and 15<q²<19 GeV²/c⁴. The results agree with the standard model expectation of lepton flavor universality.

Citations

• The Large-Sample Distribution of the Likelihood Ratio for Testing Composite Hypotheses
• Bootstrap Methods: Another Look at the Jackknife
• Geant4 developments and applications
• Test of lepton universality in beauty-quark decays
• Review of Particle Physics
• Constraints on the photon polarisation in b → sγ transitions using B_s⁰ → ϕe+e− decays

Discussions

• Test of lepton flavour universality with Bₛ⁰→ϕℓ⁺ℓ⁻ decays arxiv.org/abs/2410.13748 - Branching fraction ratios between the Bₛ⁰→ϕe⁺e⁻ and Bₛ⁰→ϕμ⁺μ⁻ decays are measured in three regions of dilepton mass [bsky, 6 points, 1 comments]

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