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Aaij, R.; Amhis, Y.; Barsuk, S.; Fleuret, F.; Kochebina, O.; Lefrançois, J.; Li, Y.; Machefert, F.; Manca, G.; Massacrier, L.M.; Quagliani, R.; Renaudin, V.; Robbe, P.; Schune, M.-H.; Vallier, A.; Viaud, B.; Wormser, G.; Ajaltouni, Z.J.; Baalouch, M.; Cogneras, E.; Deschamps, O.; El Rifai, I.; Gazzoni, G.; Grabalosa Gándara, M.; Henrard, Pierre; Hoballah, M.; Kozeiha, M.; Lefèvre, R.; Maratas, J.; Monteil, S.; Niess, V.; Perret, P.; Akar, S.; Aslanides, E.; Cogan, J.; De Bruyn, K.; Kanso, W.; Legac, R.; Leroy, O.; Mancinelli, G.; Martin, M.; Mordà, A.; Serrano, J.; Tayduganov, A.; Tsaregorodtsev, A.; Beaucourt, L.; Chefdeville, M.; Decamp, D.; Déléage, N.; Ghez, P.; Lees, J.-P.; Marchand, J.-F.; Minard, M.-N.; Pietrzyk, B.; t'Jampens, S.; Tisserand, V.; Tournefier, E.
Physical review letters, 06/2016, Letnik: 116, Številka: 24Journal Article
Violations of $ CPT$ symmetry and Lorentz invariance are searched for by studying interference effects in $ B^0$ mixing and in $ B^0_s$ mixing. Samples of $ B^0\to J/\psi K^0_{\mathrm{S}}$ and $ B^0_s\to J/\psi K^+ K^-$ decays are recorded by the LHCb detector in proton--proton collisions at centre-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 $ \mathcal{O}(10^{-15})$ and $ \mathcal{O}(10^{-14})$ GeV for the $ B^0$ and $ B^0_s$ systems, respectively. With no assumption on Lorentz (non-)invariance, the $ CPT$-violating parameter $z$ in the $ B^0_s$ system is measured for the first time and found to be $ \mathcal{R}e(z) = -0.022 \pm 0.033 \pm 0.005$ and $ \mathcal{I}m(z) = 0.004 \pm 0.011\pm 0.002$, where the first uncertainties are statistical and the second systematic.
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