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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/114426
Search for Violations of Lorentz Invariance and CPT Symmetry in B0(s) Mixing
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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.
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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. Search for Violations of Lorentz Invariance and CPT Symmetry in B0(s) Mixing. _Physical Review Letters_. 2016. Vol. 116, núm. 24, pàgs. 241601. [consulta: 20 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/114426]