Search for violations of Lorentz invariance and $ CPT$ symmetry in $ B^0_{(s)}$ mixing

R. Aaij Y. Amhis 1 S. Barsuk 1 F. Fleuret 1 O. Kochebina 1 J. Lefrançois 1 Y. Li 1 F. Machefert 1 G. Manca 1 L.M. Massacrier 1 R. Quagliani 1 V. Renaudin 1 P. Robbe 1 M.-H. Schune 1 A. Vallier 1 B. Viaud 1 G. Wormser 1 Z.J. Ajaltouni 2 M. Baalouch 2 E. Cogneras 2 O. Deschamps 2 I. El Rifai 2 G. Gazzoni 2 M. Grabalosa Gándara 2 Pierre Henrard 2 M. Hoballah 2 M. Kozeiha 2 R. Lefèvre 2 J. Maratas 2 S. Monteil 2 V. Niess 2 P. Perret 2 S. Akar 3 E. Aslanides 3 J. Cogan 3 K. De Bruyn 3 W. Kanso 3 R. Legac 3 O. Leroy 3 G. Mancinelli 3 M. Martin 3 A. Mordà 3 J. Serrano 3 A. Tayduganov 3 A. Tsaregorodtsev 3 L. Beaucourt 4 M. Chefdeville 4 D. Decamp 4 N. Déléage 4 P. Ghez 4 J.-P. Lees 4 J.-F. Marchand 4 M.-N. Minard 4 B. Pietrzyk 4 S. t'Jampens 4 V. Tisserand 4 E. Tournefier 4
1 LAL - Laboratoire de l'Accélérateur Linéaire
2 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
3 CPPM - Centre de Physique des Particules de Marseille
4 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
Abstract : 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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Submitted on : Wednesday, March 16, 2016 - 11:56:17 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, Y. Amhis, S. Barsuk, F. Fleuret, O. Kochebina, et al.. Search for violations of Lorentz invariance and $ CPT$ symmetry in $ B^0_{(s)}$ mixing. Physical Review Letters, American Physical Society, 2016, 116, pp.241601. ⟨10.1103/PhysRevLett.116.241601⟩. ⟨in2p3-01289195⟩

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