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cc-by (c) Garrido Beltrán, Lluis et al., 2015
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185660

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

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Time-dependent CP violation is measured in the ( ) B 0 → 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, ( ) B 0 s → 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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GARRIDO BELTRÁN, Lluís, et al. Measurement of the CP-violating phase β in B0→J/ψπ+π- decays and limits on penguin effects. Physics Letters B. 2015. Vol. 742, num. 38-49. ISSN 0370-2693. [consulted: 28 of May of 2026]. Available at: https://hdl.handle.net/2445/185660

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