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.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Measurement of the CP-Violating Phase β in B0 → J/ψ π+ π− Decays and Limits on Penguin Effects. PHYSICS LETTERS. SECTION B, 742, 38-49 [10.1016/j.physletb.2015.01.008].

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.
2015
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Measurement of the CP-Violating Phase β in B0 → J/ψ π+ π− Decays and Limits on Penguin Effects. PHYSICS LETTERS. SECTION B, 742, 38-49 [10.1016/j.physletb.2015.01.008].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/416976
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