We measure the time-dependent CP asymmetry in the radiative-penguin decay B0-->K0Spi-pi+gamma, using a sample of 471x10^6 Upsilon(4S)-->BBbar events recorded with the BABAR detector at the PEP-II e+e- storage ring at SLAC. Using events with m_Kpipi<1.8 GeV/c2, we measure the branching fractions of B+-->K+pi-pi+gamma and B0-->K0pi-pi+gamma, the branching fractions of the kaonic resonances decaying to K+pi-pi+, as well as the overall branching fractions of the B+-->pho0K+gamma, B+-->K*0pi+gamma and S-wave B+-->(Kpi)*0_0pi+gamma components. For events from the rho mass band, we measure the CP-violating parameters S_K0Spi+pi-gamma =0.14±0.25±0.03 and C_K0Spi+pi-gamma=-0.39±0.20-0.02+0.03, where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent CP asymmetry related to the CP eigenstate rho0KS0 and obtain S_K0Srhogamma=-0.18±0.32-0.05+0.06, which provides information on the photon polarization in the underlying b-->s gamma transition.
Time-dependent analysis of B0 --> KS0pi+pi-gamma decays and studies of the K+pi-pi+ system in B+ --> K+pi-pi+gamma decays
Calabrese, R.;Garzia, I.;Luppi, E.;
2016
Abstract
We measure the time-dependent CP asymmetry in the radiative-penguin decay B0-->K0Spi-pi+gamma, using a sample of 471x10^6 Upsilon(4S)-->BBbar events recorded with the BABAR detector at the PEP-II e+e- storage ring at SLAC. Using events with m_Kpipi<1.8 GeV/c2, we measure the branching fractions of B+-->K+pi-pi+gamma and B0-->K0pi-pi+gamma, the branching fractions of the kaonic resonances decaying to K+pi-pi+, as well as the overall branching fractions of the B+-->pho0K+gamma, B+-->K*0pi+gamma and S-wave B+-->(Kpi)*0_0pi+gamma components. For events from the rho mass band, we measure the CP-violating parameters S_K0Spi+pi-gamma =0.14±0.25±0.03 and C_K0Spi+pi-gamma=-0.39±0.20-0.02+0.03, where the first uncertainties are statistical and the second are systematic. We extract from this measurement the time-dependent CP asymmetry related to the CP eigenstate rho0KS0 and obtain S_K0Srhogamma=-0.18±0.32-0.05+0.06, which provides information on the photon polarization in the underlying b-->s gamma transition.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
