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Regular version of the site

Article

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

Physical Review Letters. 2020. Vol. 124. No. 3. P. 031801.
Boldyrev A., Derkach D., Guschin M., Kazeev N., Maevskiy A., Ratnikov F., Ustyuzhanin A., Arzymatov K., Баранов А. С., Belavin V., Borisyak M., Chekalina V., LHCb C.

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.