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Time-dependent analysis of B0 → KS0π-π+γ decays and studies of the K+π-π+ system in B+ → K+π-π+γ decays
We measure the time-dependent CP asymmetry in the radiative-penguin decay B0 → KS0π-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 B...
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Published in: | Physical review. D 2016-03, Vol.93 (5) |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | We measure the time-dependent CP asymmetry in the radiative-penguin decay B0 → KS0π-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)0*0π+γ components. For events from the ρ mass band, we measure the CP-violating parameters SKS0π+π-γ=0.14±0.25±0.03 and CKS0π+π-γ=-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 ρ0KS0 and obtain SKS0ργ=-0.18±0.32-0.05+0.06, which provides information on the photon polarization in the underlying b→sγ transition. |
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ISSN: | 2470-0010 2470-0029 |