We measure the time-dependent CP asymmetry in the radiative-penguin decay B0→K0Sπ−π+γ, using a sample of 471×106 ϒ(4S)→BB¯ events recorded with the BABAR detector at the PEP-II e+e− storage ring at SLAC. Using events with mKππ<1.8  GeV/c2, we measure the branching fractions of B+→K+π−π+γ and B0→K0π−π+γ, the branching fractions of the kaonic resonances decaying to K+π−π+, as well as the overall branching fractions of the B+→ρ0K+γ, B+→K*0π+γ and S-wave B+→(Kπ)*00π+γ components. For events from the ρ mass band, we measure the CP-violating parameters K0Sπ+π−γ=0.14±0.25±0.03 and K0Sπ+π−γ=−0.39±0.20+0.03−0.02, 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 ρ0K0S and obtain K0Sργ=−0.18±0.32+0.06−0.05, which provides information on the photon polarization in the underlying b→sγ transition.

Del Amo Sanchez, P., Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., et al. (2016). Time-dependent analysis of B0 → KS0 π-π+γ decays and studies of the K+π-π+ system in B+ →k+π-π+γ decays. PHYSICAL REVIEW D, 93(5), 1-29 [10.1103/PhysRevD.93.052013].

Time-dependent analysis of B0 → KS0 π-π+γ decays and studies of the K+π-π+ system in B+ →k+π-π+γ decays

PATRIGNANI, CLAUDIA;
2016

Abstract

We measure the time-dependent CP asymmetry in the radiative-penguin decay B0→K0Sπ−π+γ, using a sample of 471×106 ϒ(4S)→BB¯ events recorded with the BABAR detector at the PEP-II e+e− storage ring at SLAC. Using events with mKππ<1.8  GeV/c2, we measure the branching fractions of B+→K+π−π+γ and B0→K0π−π+γ, the branching fractions of the kaonic resonances decaying to K+π−π+, as well as the overall branching fractions of the B+→ρ0K+γ, B+→K*0π+γ and S-wave B+→(Kπ)*00π+γ components. For events from the ρ mass band, we measure the CP-violating parameters K0Sπ+π−γ=0.14±0.25±0.03 and K0Sπ+π−γ=−0.39±0.20+0.03−0.02, 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 ρ0K0S and obtain K0Sργ=−0.18±0.32+0.06−0.05, which provides information on the photon polarization in the underlying b→sγ transition.
2016
Del Amo Sanchez, P., Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., et al. (2016). Time-dependent analysis of B0 → KS0 π-π+γ decays and studies of the K+π-π+ system in B+ →k+π-π+γ decays. PHYSICAL REVIEW D, 93(5), 1-29 [10.1103/PhysRevD.93.052013].
Del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu. ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/537430
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