An analysis of Λ_b⁰ → Λμ⁺μ^- decays at the LHCb experiment

2015/04/17 by Pescatore, L., For
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1504.04462

Abstract

The branching fraction of the rare decay Λ_b⁰ → Λμ⁺ μ^- is measured as a function of q², the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb^-1, collected by the LHCb experiment. Evidence of signal is found for the first time in the q² region below the square of the J/ψ mass. In the q² intervals where the signal is observed, angular distributions are studied and two forward-backward asymmetries, in the dimuon and hadronic systems, are measured for the first time.

Related

• First observation of the Λ⁰_b → D⁺ D^- Λ decay
• Comprehensive analysis of the B⁰→ K^*0μ⁺μ^- decay
• Analysis of \itΛ⁰_b → pK^-μ⁺μ^- decays
• Observation of the Λ_b⁰ → J/ψΞ^- K⁺ and Ξ_b⁰ → J/ψΞ^- π⁺ decays
• Measurement of the branching fraction of the Λ_b⁰→ J/ψΛ decay and isospin asymmetry of B→ J/ψK decays