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)0π+ 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., Abellan 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) [10.1103/PhysRevLett.124.031801].

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

Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinazzoli L.;Martinelli M.;Petruzzo M.;
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)0π+ 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.
Articolo in rivista - Articolo scientifico
LHCb
English
2020
124
3
031801
none
Aaij, R., Abellan 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) [10.1103/PhysRevLett.124.031801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/289329
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