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Test of Lepton Universality Using B+→K+ℓ+ℓ− Decays

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A measurement of the ratio of the branching fractions of the B + → K + μ + μ − and B + → K + e + e − decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0     fb − 1 , recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1 < q 2 < 6     GeV 2 / c 4 is measured to be 0.74 5 + 0.090 − 0.074 ( 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.

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Test of Lepton Universality Using B+→K+ℓ+ℓ− Decays