Improved measurements of the branching fractions for B-0 ->pi(+) pi(-) and B-0 -> K+ pi(-), and a search for B-0 -> K+ K-
文献类型：期刊论文
| 作者 | BaBar Collaboration |
| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2007 |
| 卷号 | 75期号:1 |
| 关键词 | B-MESONS PI-K DECAYS GAMMA FACTORIZATION DETECTOR RATIOS |
| 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. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000243896200015 |
| 公开日期 | 2016-02-26 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/212781]  |
| 专题 | 高能物理研究所_实验物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | 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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来源：高能物理研究所
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