A measurement of the ratio of the branching fractions of the B^{+}K^{+}mu^{+}mu^{-} and B^{+}K^{+}e^{+}e^{-} decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0fb^{-1}, recorded with the LHCb experiment at center-of-mass energies of 7 and 8TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1<q^{2}<6GeV^{2}/c^{4} is measured to be 0.745_{-0.074}^{+0.090}(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.
Archilli, F., Carboni, G., Santovetti, E., The LHCb, C. (2014). Test of lepton universality using b^{+}k^{+}ℓ^{+}ℓ^{-} decays. PHYSICAL REVIEW LETTERS, 113(15), 151601 [10.1103/PhysRevLett.113.151601].
Test of lepton universality using b^{+}k^{+}ℓ^{+}ℓ^{-} decays
Archilli, FMembro del Collaboration Group
;Carboni, GMembro del Collaboration Group
;Santovetti, EMembro del Collaboration Group
;
2014-01-01
Abstract
A measurement of the ratio of the branching fractions of the B^{+}K^{+}mu^{+}mu^{-} and B^{+}K^{+}e^{+}e^{-} decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0fb^{-1}, recorded with the LHCb experiment at center-of-mass energies of 7 and 8TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
