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Measurement of the CP-violating phase $\phi_s$ in $\overline{B}^0_s\rightarrow J/\psi \pi^+\pi^-$ decays

Abstract : The mixing-induced CP-violating phase $\phi_s$ in ${B}^0_s$ and $\overline{B}^0_s$ decays is measured using the $J/\psi \pi^+\pi^-$ final state in data, taken from 3\,fb$^{-1}$ of integrated luminosity, collected with the LHCb detector in 7 and 8 TeV centre-of-mass $pp$ collisions at the LHC. A time-dependent flavour-tagged amplitude analysis, allowing for direct \CP violation, yields a value for the phase $\phi_s=70\pm 68\pm 8$\,mrad. This result is consistent with the Standard Model expectation and previous measurements.
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Contributor : Sabine Starita <>
Submitted on : Monday, May 19, 2014 - 10:53:44 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:13 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Callot, et al.. Measurement of the CP-violating phase $\phi_s$ in $\overline{B}^0_s\rightarrow J/\psi \pi^+\pi^-$ decays. Physics Letters B, Elsevier, 2014, 736, pp.186-195. ⟨10.1016/j.physletb.2014.06.079⟩. ⟨in2p3-00992694⟩



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