Time-dependent CP violation is measured in the (anti)-B0 → J/ψ π+ 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/ψ ρ0(770), is used to measure the CP-violating angle 2β^eff to be (41.7 ± 9.6{−6.3}{+2.8})°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, (anti)-B0s → J/ψ φ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase φ_s 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.
Measurement of the CP-Violating Phase β in B0 → J/ψ π+ π− Decays and Limits on Penguin Effects
CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015
Abstract
Time-dependent CP violation is measured in the (anti)-B0 → J/ψ π+ 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/ψ ρ0(770), is used to measure the CP-violating angle 2β^eff to be (41.7 ± 9.6{−6.3}{+2.8})°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, (anti)-B0s → J/ψ φ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase φ_s 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.File | Dimensione | Formato | |
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2015-AR-04-Meas_of_the_CP_Viol_Phase_beta_in_B0_to_JPsi_pip_pim_Dec-PLB.pdf
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