The time-dependent CP asymmetries of B0→ π+π− and Bs0→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are Cππ=−0.311±0.045±0.015,Sππ=−0.706±0.042±0.013,CKK=0.123±0.034±0.015,SKK=0.164±0.034±0.014,AKKΔΓ=−0.83±0.05±0.09, where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and Bs0→K−π+ decays and the results areACPB0=−0.0824±0.0033±0.0033,ACPBs0=0.236±0.013±0.011. All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in Bs0 decays. [Figure not available: see fulltext.]

Observation of CP violation in two-body B(s)0 -meson decays to charged pions and kaons

Calabrese R.;Capriotti L.;Couturier B.;Fiorini M.;Franzoso E.;Giugliano C.;Guarise M.;Kotriakhova S.;Luppi E.;Neri I.;Pappalardo L. L.;Passalacqua B.;Siddi B. G.;Tomassetti L.;
2021

Abstract

The time-dependent CP asymmetries of B0→ π+π− and Bs0→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are Cππ=−0.311±0.045±0.015,Sππ=−0.706±0.042±0.013,CKK=0.123±0.034±0.015,SKK=0.164±0.034±0.014,AKKΔΓ=−0.83±0.05±0.09, where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0→ K + π− and Bs0→K−π+ decays and the results areACPB0=−0.0824±0.0033±0.0033,ACPBs0=0.236±0.013±0.011. All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in Bs0 decays. [Figure not available: see fulltext.]
2021
Aaij, R.; Abellan Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C. A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2476478
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