Time-dependent analysis of B[superscript 0] → K[0 over S]π[superscript −]π[superscript +]γ decays and studies of the K[superscript +]π[superscript −]π[superscript +] system in B[superscript +] → K[superscript +]π[superscript −]π[superscript +]γ decays
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PhysRevD.93.052013.pdf
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Author(s)
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.
Date Issued
March 2016
Journal
Physical Review D
Publisher
American Physical Society
Citation
Del Amo Sanchez, P., J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, et al. “Time-Dependent Analysis of B[superscript 0] → K[0 over S]π[superscript −]π[superscript +]γ Decays and Studies of the K[superscript +]π[superscript −]π[superscript +] System in B[superscript +] → K[superscript +]π[superscript −]π[superscript +]γ decays.” Phys. Rev. D 93, no. 5 (March 29, 2016). © 2016 American Physical Society
Version
Final published version
Abstract
We measure the time-dependent CP asymmetry in the radiative-penguin decay B[superscript 0] → K[0 over S]π[superscript -]π[superscript +]γ, using a sample of 471 × 10[superscript 6] ϒ(4S) → B[bar over B] events recorded with the BABAR detector at the PEP-II e[superscript +]e[superscript -] storage ring at SLAC. Using events with m[subscript Kππ] < 1.8 GeV/c[superscript 2], we measure the branching fractions of B[superscript +] → K[superscript +]π[superscript -]π[superscript +]γ and B[superscript 0] → K[superscript 0]π[superscript -]π[superscript +]γ, the branching fractions of the kaonic resonances decaying to K[superscript +]π[superscript -]π[superscript +], as well as the overall branching fractions of the B[superscript +] → ρ[superscript 0]K[superscript +]γ, B[superscript +] → K[superscript *0]π[superscript +]γ and S-wave B[superscript +] → (Kπ)[*0 over 0]π[superscript +]γ components. For events from the ρ mass band, we measure the CP-violating parameters S[subscript K[0 over S]π[superscript +]π[superscript -]γ] = 0.14 ± 0.25 ± 0.03 and C[subscript K[0 over S]π[superscript +]π[superscript -]γ] = -0.39 ± 0.20[+0.03 over -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 ρ[superscript 0]K[0 over S] and obtain S[subscript K[0 over S]ργ] = -0.18 ± 0.32[+0.06 over -0.05], which provides information on the photon polarization in the underlying b → sγ transition.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.93.052013
