Measurement of the CP-violating phase ϕs in Bs->J/ψπ+π- decays

Abstract

Measurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/ψpi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.

arXiv comment15 pages, 10 figures; minor revisions on May 23, 2012

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• Measurement of the CP-violating weak phase phi[s] and the decay width difference Delta Gamma[s] using the Bs to J/Psi phi(1020) decay channel in pp collisions at sqrt(s) = 8 TeV
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• Rare Decays and CP Violation in the $B_s$ System
• Measurement of the $CP$-violating phase ${\varphi }_{\mathrm{s}}$ in the B${}_{\mathrm{s}}^0$ $\to$ J$/\psi \varphi$(1020) $\to$ ${\mu }^{+}{\mu }^{-}$K${}^{+}$K${}^{-}$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The $S$-wave resonance contributions to the three-body decays $B_{(s)}^0\to {\eta }_c{f}_0(X)\to {\eta }_c{\pi }^{+}{\pi }^{-}$ in perturbative QCD approach
• Observations of $B_s^0\to \psi (2S)\eta$ and $B_{(s)}^0\to \psi (2S){\pi }^{+}{\pi }^{-}$ decays
• $P$-wave contributions to $B\to \psi \pi \pi$ decays in perturbative QCD approach
• Measurement of the Bs effective lifetime in the J/psi f0(980) final state
• Time-dependent Dalitz-plot formalism for B_q -> J/ψ h+ h-
• Observation of the decay ${\overline{B}}_s^0\to \psi (2S)K^{+}{\pi }^{-}$
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• First evidence for mixing-induced $CP$ violation in B${}_{\mathrm{s}}^0$ $\to$ J/$\psi \varphi$(1020) decays in pp collisions at $\sqrt{s}=$ 13 TeV
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• A Search for pair production of the LSP $\widetilde{{\nu }_{\tau }}$ at the CLIC via RPV Decays
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