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oai:recercat.cat:2445/1144262025-12-05T16:39:16Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Search for Violations of Lorentz Invariance and CPT Symmetry in B0(s) Mixing Garrido Beltrán, Lluís Graugés Pous, Eugeni Rives Molina, Vicente José Graciani Díaz, Ricardo Picatoste Olloqui, Eduardo Calvo Gómez, Míriam Gascón Fora, David Marin Benito, Carla Vilasis-Cardona, Xavier LHCb Collaboration Espais de Lorentz Violació CP (Física nuclear) Gran Col·lisionador d'Hadrons Lorentz spaces CP violation (Nuclear physics) Large Hadron Collider (France and Switzerland) Violations of CPT symmetry and Lorentz invariance are searched for by studying interference effects in B-0 mixing and in B-s(0) mixing. Samples of B-0 -> J/psi K-S(0) and B-0(s) -> J/psi K+K- decays are recorded by the LHCb detector in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb(-1). No periodic variations of the particle-antiparticle mass differences are found, consistent with Lorentz invariance and CPT symmetry. Results are expressed in terms of the standard model extension parameter Delta a(mu) with precisions of O(10(-15)) and O(10(-14)) GeV for the B-0 and B-s(0) systems, respectively. With no assumption on Lorentz (non) invariance, the CPT-violating parameter z in the B-s(0) system is measured for the first time and found to be Re(z) = -0.022 +/- 0.033 +/- 0.005 and Im(z) = 0.004 +/- 0.011 +/- 0.002, where the first uncertainties are statistical and the second systematic. 2017-07-27T10:02:09Z 2017-07-27T10:02:09Z 2016-06-15 2017-07-27T10:02:09Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.116.241601 Physical Review Letters, 2016, vol. 116, num. 24, p. 241601 https://doi.org/10.1103/PhysRevLett.116.241601 cc-by (c) CERN, 2016 http://creativecommons.org/licenses/by/3.0/es info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)