2026-04-19T13:32:42Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Garrido Beltrán, Lluís author Graugés Pous, Eugeni author Rives Molina, Vicente José author Graciani Díaz, Ricardo author Picatoste Olloqui, Eduardo author Calvo Gómez, Míriam author Gascón Fora, David author Marin Benito, Carla author Vilasis-Cardona, Xavier author LHCb Collaboration author 2017-07-27T10:02:09Z 2017-07-27T10:02:09Z 2016-06-15 2017-07-27T10:02:09Z 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. Espais de Lorentz Violació CP (Física nuclear) Gran Col·lisionador d'Hadrons Lorentz spaces CP violation (Nuclear physics) Large Hadron Collider (France and Switzerland) Search for Violations of Lorentz Invariance and CPT Symmetry in B0(s) Mixing