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Search for Lepton-Universality Violation in B^{+}→K^{+}ℓ^{+}ℓ^{-} Decays.

Published version
Peer-reviewed

Type

Article

Change log

Authors

Aaij, R 
Abellán Beteta, C 
Adeva, B 
Adinolfi, M 
Aidala, CA 

Abstract

A measurement of the ratio of branching fractions of the decays B^{+}→K^{+}μ^{+}μ^{-} and B^{+}→K^{+}e^{+}e^{-} is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0  fb^{-1} recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1<q^{2}<6.0  GeV^{2}/c^{4} the ratio of branching fractions is measured to be R_{K}=0.846_{-0.054}^{+0.060}{-0.014}^{+0.016}, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of R{K} to date and is compatible with the standard model at the level of 2.5 standard deviations.

Description

Keywords

LHCb Collaboration <a href="#n1">1</a>

Journal Title

Phys Rev Lett

Conference Name

Journal ISSN

0031-9007
1079-7114

Volume Title

122

Publisher

American Physical Society (APS)
Sponsorship
Science and Technology Facilities Council (ST/N000234/1)