Abstract
A simultaneous analysis of the and decays is performed to test muon-electron universality in two ranges of the square of the dilepton invariant mass, . The measurement uses a sample of beauty meson decays produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of . A sequence of multivariate selections and strict particle identification requirements produce a higher signal purity and a better statistical sensitivity per unit luminosity than previous LHCb lepton universality tests using the same decay modes. Residual backgrounds due to misidentified hadronic decays are studied using data and included in the fit model. Each of the four lepton universality measurements reported is either the first in the given interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.
22 More- Received 20 December 2022
- Accepted 6 June 2023
DOI:https://doi.org/10.1103/PhysRevD.108.032002
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
© 2023 CERN, for the LHCb Collaboration
Physics Subject Headings (PhySH)
synopsis
Standard Model Stays Strong for Leptons
Published 2 August 2023
New data from observations of B-meson decay again vindicate the standard model of particle physics.
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