| |
Abstract |
A test of lepton universality between muons and electrons is performed using B+ -> K+ l(+)l(-) decays (where l = e, mu), in the dilepton invariant-mass-squared region above 14.3 GeV2/c(4). The data used for the measurement consists of beauty meson decays produced in proton-proton collisions, corresponding to an integrated luminosity of 9 fb(-1), collected by the LHCb experiment between 2011 and 2018. The ratio of branching fractions for B+ -> K+ mu(+)mu(-) and B+ -> K+ e(+)e(-) decays is measured to be R-K = 1.08(-0.09)(+0.11) (stat) (+0.04)(-0.04) (syst), which is consistent with the Standard Model prediction of unity. This constitutes the most precise test of lepton flavour universality using B+ -> K+ l(+)l(-) decays with dilepton invariant-mass-squared above the psi(2S) mass, whilst being the first of its kind at a hadron collider. |
|
| |
Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Fujii, Y.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Australia, Email: dl225@ic.ac.uk |
|
