Abstract
A measurement of the ratio of branching fractions R(J/ψ)=B(Bc+→J/ψτ+ντ)/B(Bc+→J/ψμ+νμ) in the J/ψ→μ+μ−, τ+→μ+νμν¯τ decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2018, corresponding to an integrated luminosity of 59.7 fb−1. The measured ratio, R(J/ψ)=0.17−0.17+0.18(stat)−0.22+0.21(syst)−0.18+0.19(theo)=0.17±0.33, agrees with the value of 0.2582±0.0038 predicted by the standard model, which assumes lepton flavor universality. By testing lepton flavor universality, this measurement is a probe of new physics using Bc+ mesons, which are currently only produced at the LHC.
Keywords
Mathematics
Artificial intelligence
Computer science
Subject Areas
Particle physics theoretical and experimental studies
·Nuclear and High Energy Physics ·Physical Sciences
Quantum Chromodynamics and Particle Interactions
·Nuclear and High Energy Physics ·Physical Sciences
High-Energy Particle Collisions Research
·Nuclear and High Energy Physics ·Physical Sciences
Citations by Year
2025: 1
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