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#### Search for violations of Lorentz invariance and CPT symmetry in B0(s) mixing

##### MPS-Authors
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Aquines Gutierrez,  O.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Blouw,  Johan
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Britsch,  Markward
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Fontana,  Marianna
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Popov,  Dmitry
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  Michael
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  Mikhail
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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##### Fulltext (public)

1603.04804.pdf
(Preprint), 537KB

##### Supplementary Material (public)
There is no public supplementary material available
##### Citation

LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Ajaltouni, Z., et al. (2016). Search for violations of Lorentz invariance and CPT symmetry in B0(s) mixing. Physical Review Letters, 116(24): 241601. doi:10.1103/PhysRevLett.116.241601.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-2070-1
##### 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.