# Measurement of the CP-violating phase β in B0→J/ψπ+π− decays and limits on penguin effects

Abstract : Time-dependent CP violation is measured in the B0→J/ψπ+π− channel for each π+π− resonant final state using data collected with an integrated luminosity of 3.0 fb−1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6+2.8−6.3)∘. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B0s→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [−1.05∘, +1.18∘] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.
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Journal articles

Cited literature [39 references]

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Submitted on : Thursday, February 26, 2015 - 3:23:52 PM
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### Citation

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Measurement of the CP-violating phase β in B0→J/ψπ+π− decays and limits on penguin effects. Physics Letters B, Elsevier, 2015, 742, pp.38-49. ⟨10.1016/j.physletb.2015.01.008⟩. ⟨in2p3-01081128⟩

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