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http://hdl.handle.net/2445/133199| 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 Experiments Particle physics Experiments |
| 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: https://doi.org/10.1103/PhysRevLett.113.151601 |
| It is part of: | Physical Review Letters, 2014, vol. 113, num. 15, p. 151601 |
| URI: | http://hdl.handle.net/2445/133199 |
| Related resource: | https://doi.org/10.1103/PhysRevLett.113.151601 |
| 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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