A time-dependent analysis of the B_s^0→ϕγ decay rate is performed to determine the CP -violating observables S_ϕγ and C_ϕγ and the mixing-induced observable A_ϕγ^Δ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb^-1 at center-of-mass energies of 7 and 8 TeV. The measured values are S_ϕγ=0.43±0.30±0.11, C_ϕγ=0.11±0.29±0.11, and A_ϕγ^Δ=-0.67_-0.41^+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative B_s^0 decays. The results are consistent with the standard model predictions.
Measurement of CP-Violating and Mixing-Induced Observables in B_s^0→ϕγ Decays
Veltri, M;
2019
Abstract
A time-dependent analysis of the B_s^0→ϕγ decay rate is performed to determine the CP -violating observables S_ϕγ and C_ϕγ and the mixing-induced observable A_ϕγ^Δ. The measurement is based on a sample of pp collision data recorded with the LHCb detector, corresponding to an integrated luminosity of 3 fb^-1 at center-of-mass energies of 7 and 8 TeV. The measured values are S_ϕγ=0.43±0.30±0.11, C_ϕγ=0.11±0.29±0.11, and A_ϕγ^Δ=-0.67_-0.41^+0.37±0.17, where the first uncertainty is statistical and the second systematic. This is the first measurement of the observables S and C in radiative B_s^0 decays. The results are consistent with the standard model predictions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
