Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-
BaBar Collaboration
刊名PHYSICAL REVIEW D
2007
卷号75期号:1
关键词B-MESONS PI-K DECAYS GAMMA FACTORIZATION DETECTOR RATIOS
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.75.012008
通讯作者Aubert, B (reprint author), Lab Phys Particules, F-74941 Annecy Le Vieux, France.
英文摘要We present measurements of the branching fractions for the charmless two-body decays B-0 ->pi(+)pi(-) and B-0 -> K+pi(-), and a search for the decay B-0 -> K+K-. We include the effects of final-state radiation from the daughter mesons for the first time, and quote branching fractions for the inclusive processes B-0 -> h(+)h('-)n gamma, where h and h(') are pions or kaons. The maximum value of the sum of the energies of the n undetected photons, E-gamma(max), is mode-dependent. Using a data sample of approximately 227x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC, we measure: B(B-0 ->pi(+)pi(-)n gamma;E-gamma(max)=150 MeV)=(5.1 +/- 0.4 +/- 0.2)x10(-6), B(B-0 -> K+pi(-)n gamma;E-gamma(max)=105 MeV)=(18.1 +/- 0.6 +/- 0.6)x10(-6), B(B-0 -> K(+)K(-)n gamma;E-gamma(max)=59 MeV)< 0.5x10(-6)(90% confidence level), where the first uncertainty is statistical and the second is systematic. Theoretical calculations can be used to extrapolate from the above measurements the nonradiative branching fractions, B-0. Using one such calculation, we find: B-0(B-0 ->pi(+)pi(-))=(5.5 +/- 0.4 +/- 0.3)x10(-6), B-0(B-0 -> K+pi(-))=(19.1 +/- 0.6 +/- 0.6)x10(-6), B-0(B-0 -> K+K-)< 0.5x10(-6)(90% confidence level). Meaningful comparison between theory and experiment, as well as combination of measurements from different experiments, can be performed only in terms of these nonradiative quantities.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000243896200015
引用统计
被引频次:31[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212781
专题中国科学院高能物理研究所_实验物理中心_期刊论文
作者单位中国科学院高能物理研究所
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BaBar Collaboration. Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-[J]. PHYSICAL REVIEW D,2007,75(1).
APA BaBar Collaboration.(2007).Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-.PHYSICAL REVIEW D,75(1).
MLA BaBar Collaboration."Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-".PHYSICAL REVIEW D 75.1(2007).
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