# 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.
Document type :
Journal articles
Domain :

http://hal.in2p3.fr/in2p3-00992694
Contributor : Sabine Starita Connect in order to contact the contributor
Submitted on : Monday, May 19, 2014 - 10:53:44 AM
Last modification on : Sunday, June 26, 2022 - 12:01:21 PM

### Citation

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⟩

Record views