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 SK0Sπ+π−γ=0.14±0.25±0.03 and CK0Sπ+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 SK0Sργ=−0.18±0.32+0.06−0.05, which provides information on the photon polarization in the underlying b→sγ transition.

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

BIANCHI, Fabrizio;DE MORI, FRANCESCA;GAMBA, Diego;
2016-01-01

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 SK0Sπ+π−γ=0.14±0.25±0.03 and CK0Sπ+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 SK0Sργ=−0.18±0.32+0.06−0.05, which provides information on the photon polarization in the underlying b→sγ transition.
2016
93
5
052013-1
052013-29
http://harvest.aps.org/bagit/articles/10.1103/PhysRevD.93.052013/apsxml
Nuclear and High Energy Physics
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/2318/1569479
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