Observations are reported of different sources of CP violation from an amplitude analysis of B+ → π+ π+ π− decays, based on a data sample corresponding to an integrated luminosity of 3 fb^−1 of pp collisions recorded with the LHCb detector. A large CP asymmetry is observed in the decay amplitude involving the tensor f2(1270) resonance, and in addition significant CP violation is found in the π+ π− S wave at low invariant mass. The presence of CP violation related to interference between the π+ π− S wave and the P wave B+ → ρ(770)0 π+ amplitude is also established; this causes large local asymmetries but cancels when integrated over the phase space of the decay. The results provide both qualitative and quantitative new insights into CP-violation effects in hadronic B decays.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2020). Observation of Several Sources of CP Violation in B+ → π+ π+ π− Decays. PHYSICAL REVIEW LETTERS, 124(3), 1-11 [10.1103/PhysRevLett.124.031801].

Observation of Several Sources of CP Violation in B+ → π+ π+ π− Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Gioventù, A.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2020

Abstract

Observations are reported of different sources of CP violation from an amplitude analysis of B+ → π+ π+ π− decays, based on a data sample corresponding to an integrated luminosity of 3 fb^−1 of pp collisions recorded with the LHCb detector. A large CP asymmetry is observed in the decay amplitude involving the tensor f2(1270) resonance, and in addition significant CP violation is found in the π+ π− S wave at low invariant mass. The presence of CP violation related to interference between the π+ π− S wave and the P wave B+ → ρ(770)0 π+ amplitude is also established; this causes large local asymmetries but cancels when integrated over the phase space of the decay. The results provide both qualitative and quantitative new insights into CP-violation effects in hadronic B decays.
2020
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2020). Observation of Several Sources of CP Violation in B+ → π+ π+ π− Decays. PHYSICAL REVIEW LETTERS, 124(3), 1-11 [10.1103/PhysRevLett.124.031801].
Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/720652
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