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Title: Test of Lepton Universality Using B+→K+ℓ+ℓ− Decays
Author: Badalov, Alexey
Calvo Gómez, Míriam
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 6-Oct-2014
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2014, vol. 113, num. 15, p. 151601
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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