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Title: Test of Lepton Flavor Universality with B + K + π + π + Decays

Journal Article · · Physical Review Letters
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The first test of lepton flavor universality between muons and electrons using B + K + π + π + ( = e , μ ) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb 1 . The ratio of branching fractions between B + K + π + π e + e and B + K + π + π μ + μ decays is measured in the dilepton invariant-mass-squared range 1.1 < q 2 < 7.0 GeV 2 / c 4 and is found to be R K π π 1 = 1.3 1 0.17 + 0.18 ( stat ) 0.09 + 0.12 ( syst ) , in agreement with the standard model prediction. The first observation of the B + K + π + π e + e decay is also reported. © 2025 CERN, for the LHCb Collaboration 2025 CERN

Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI ID:
2565482
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 134; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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