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Title: | Test of lepton universality with B 0 → K *0 ℓ + ℓ - decays |
Author: | Camboni, Alessandro Coquereau, S. Fernandez, G. Garrido Beltrán, Lluís Gascon, D. Graciani Diaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, E. Rives Molina, V. Sanchez Gonzalo, D. Alfonso Albero, Alejandro Calvo Gomez, M. Gironella Gironell, P. Vazquez Gomez, R. LHCb Collaboration |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | Aug-2017 |
Publisher: | Springer Verlag |
Abstract: | A test of lepton universality, performed by measuring the ratio of the branching fractions of the B 0 → K *0 μ + μ - and B 0 → K *0 e + e - decays, {R}_{K^{*0}} , is presented. The K *0 meson is reconstructed in the final state K + π -, which is required to have an invariant mass within 100 MeV /c 2 of the known K *(892)0 mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of about 3 fb-1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ratio is measured in two regions of the dilepton invariant mass squared, q 2, to be {R}_{K^{*0}}= 0.66-+_{0.07}^{0.11}(stat)± 0.03(syst) for .045<{q}^2<1.1 GeV^2/{c}^4, 0.69-+_{0.07}^{0.11}(stat)± 0.05(syst) for 1.1<{q}^2<6.0 GeV^2/{c}^4. The corresponding 95.4% confidence level intervals are [0 .52 , 0 .89] and [0 .53 , 0 .94]. The results, which represent the most precise measurements of {R}_{K^{*0}} to date, are compatible with the Standard Model expectations at the level of 2.1-2.3 and 2.4-2.5 standard deviations in the two q 2 regions, respectively. |
Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP08(2017)055 |
It is part of: | Journal of High Energy Physics, 2017, vol. 2017, num. 55, p. 1-31 |
URI: | http://hdl.handle.net/2445/186476 |
Related resource: | https://doi.org/10.1007/JHEP08(2017)055 |
ISSN: | 1126-6708 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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