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arXiv 0807.4076hep-ex
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独占b \to s(d)ll衰变

Exclusive b \to s (d) ll Decays

G. Eigen

摘要:

本文给出了B -> K(*)1 + 1-稀有衰变的新的BABAR测量结果,包括分支分数、同位旋不对称性、直接CP破坏和J/psi共振以上双轻子质量的轻子味普适性.在K1 + 1-和K* 1 + 1-衰变中都观察到出乎意料的大的同位旋不对称性。对于Kl +l-和K* l+l-的组合数据,发现与SM的预测有3.9 σ的显著偏差.此外,最近报道了BABAR在B -> K* l+l-的角分析结果,其中测量了J/psi共振以下和以上的双轻子质量的K* 纵向极化和轻子前后不对称性.最后,总结了最近从BABAR搜索B -> pil +1- $ from Belle and B -> K(*) nu anti nu$的结果。

英文摘要:

New BABAR measurements are presented for the exclusive rare decays B -> K(*) l+ l- including branching fractions, isospin asymmetries, direct CP violation, and lepton flavor universality for dilepton masses below and above the J/psi resonance. Unexpectedly large isospin asymmetries are observed in both K l+l- and K* l+ l- decays. For the combined K l+l- and K* l+l- data a 3.9 sigma significant deviation from the SM prediction is found. Furthermore, recent BABAR results from an angular analysis in B -> K* l+l- are reported in which both the K* longitudinal polarization and the lepton forward-backward asymmetry are measured for dilepton masses below and above the J/psi resonance. Finally, results of recent searches for B -> pi l+l-$ from Belle and B -> K(*) nu anti nu$ from BABAR are summarized.

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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