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Measurement of the B 0 → K ∗0 e + e - branching fraction at low dilepton mass Abellan Beteta, Carlos Camboni, Alessandro Comerma Montells, Albert Garrido Beltrán, Lluís Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Calvo Gómez, Míriam Oyanguren Campos, Arantza de Pérez-Calero Yzquierdo, Antonio Ruiz Valls, Pablo Vilasis-Cardona, Xavier LHCb Collaboration Hadrons Cromodinàmica quàntica Gran Col·lisionador d'Hadrons Hadrons Quantum chromodynamics Large Hadron Collider (France and Switzerland) The branching fraction of the rare decay B0→ K∗0 e +e− in the dilepton mass region from 30 to 1000 MeV/c2 has been measured by the LHCb experiment, using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, at a centre-of-mass energy of 7 TeV. The decay mode B0 → J/ψ(e+e−)K∗0 is utilized as a normalization channel. The branching fraction B(B0 → K∗0e+e−) is measured to beB(B 0→ K∗0 e+e−)30−1000 MeV/c2= (3.1+0.9 +0.2−0.8 −0.3 ± 0.2) × 10−7 , where the first error is statistical, the second is systematic, and the third comes from the uncertainties on the B0→ J/ψ K∗0 and J/ψ → e+e− branching fractions. 2016-06-07T10:05:57Z 2016-06-07T10:05:57Z 2013-05-29 2016-06-07T10:06:02Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1126-6708 https://hdl.handle.net/2445/99303 628979 eng Reproducció del document publicat a: http://dx.doi.org/10.1007/JHEP05(2013)159 Journal of High Energy Physics, 2013, vol. 159, num. 159 http://dx.doi.org/10.1007/JHEP05(2013)159 cc-by (c) LHCb Collaboration et al., 2013 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess 18 p. application/pdf Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)