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arXiv 1012.4044hep-ex
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B ~+ -> rho0 K ~+和B ~+ -> f0(980)K ~+衰变的分支分数、极化和直接CP破坏不对称性的测量

Measurements of branching fractions, polarizations, and direct CP-violation asymmetries in B+ -> rho0 K*+ and B+ -> f0(980)K*+ decays

P. del Amo Sanchez

摘要:

我们利用SLAC国家加速器实验室的PEP-II非对称能量e^+e^-对撞机上的BaBar探测器收集的4.67亿+/-500万个BBbar对样品,测量了衰变B+ -> rho 0 K*+和B+ -> f0(980)K*+的分支分数、纵向极化和直接CP破坏不对称性。我们观察到B+ -> rho 0 K*+的显著性为5.3 sigma,并测量了分支分数Br(B+ -> rho 0 K*+)=(4.6+/-1.0+/-0.4)x 10^{-6},纵向极化fL = 0.78+/-0.12+/-0.03,以及CP破坏不对称性ACP = 0.31+/-0.13+/-0.03。我们观察到B+ -> f0(980)K*+并测量分支分数Br(B+ -> f0(980)K*+)x Br(f0(980)-> pi+pi-)=(4.2+/-0.6+/-0.3)x 10^{-6}和CP破坏ACP不对称性= -0.15+/-0.12+/-0.03。第一个不确定性是统计的,第二个是系统的。

英文摘要:

We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B+ -> rho0 K*+ and B+ -> f0(980) K*+ with a sample of 467+/-5 million BBbar pairs collected with the BaBar detector at the PEP-II asymmetric-energy e^+e^- collider at the SLAC National Accelerator Laboratory. We observe B+ -> rho0 K*+ with a significance of 5.3 sigma and measure the branching fraction Br(B+ -> rho0 K*+) = (4.6+/-1.0+/-0.4) x 10^{-6}, the longitudinal polarization fL = 0.78+/-0.12+/-0.03, and the CP-violation asymmetry ACP = 0.31+/-0.13+/-0.03. We observe B+ -> f0(980) K*+ and measure the branching fraction Br(B+ -> f0(980) K*+) x Br(f0(980) -> pi+pi-) = (4.2+/-0.6+/-0.3) x 10^{-6} and the CP-violation asymmetry ACP = -0.15+/-0.12+/-0.03. The first uncertainty quoted is statistical and the second is systematic.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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