arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.2784hep-phhep-ex
收藏

B衰变到重轻末态的因式分解和SU(3)关系的检验

Tests of Factorization and SU(3) Relations in B Decays into Heavy-Light Final States

Robert Fleischer, Nicola Serra, Niels Tuning

摘要:

利用来自B工厂和Tevatron的数据,我们检验了B -> D^{(*)}_{(s)} P(其中P是π介子或K介子)的非轻子B衰变在因子分解框架内的描述情况。我们发现,因式分解的工作原理以及-理论上预期的-颜色允许,树形图拓扑结构。此外,交换拓扑,它具有不可因式分解的字符,不显示任何异常行为。我们还讨论了B -> D^{(*)} π衰变振幅之间的同位旋三角形,并确定了复平面中相应的振幅,这表明相对于因子分解图,颜色抑制树的贡献显著增强。使用B -> D^{(*)} K衰变的数据,我们确定了SU(3)破缺效应,并且不能解决任何大于\sim 5%的不可因式分解的SU(3)破缺修正。鉴于这些结果,我们指出,比较\bar B^0_d -> D^+π^-和\bar B^0_s -> D_s^+π^-衰变,提供了一个有趣的新的f_d/f_s的测定方法。使用CDF数据,我们获得了最精确的值,这个比例在CDF,并讨论了相应的测量在LHCb的前景。

英文摘要:

Using data from the B factories and the Tevatron, we perform tests of how well non-leptonic B decays of the kind B -> D^{(*)}_{(s)} P, where P is a pion or kaon, are described within the factorization framework. We find that factorization works well - as is theoretically expected - for color-allowed, tree-diagram-like topologies. Moreover, also exchange topologies, which have a non-factorizable character, do not show any anomalous behavior. We discuss also isospin triangles between the B -> D^{(*)} pi decay amplitudes, and determine the corresponding amplitudes in the complex plane, which show a significant enhancement of the color-suppressed tree contribution with respect to the factorization picture. Using data for B -> D^{(*)} K decays, we determine SU(3)-breaking effects and cannot resolve any non-factorizable SU(3)-breaking corrections larger than \sim 5%. In view of these results, we point out that a comparison between the \bar B^0_d -> D^+π^- and \bar B^0_s -> D_s^+π^- decays offers an interesting new determination of f_d/f_s. Using CDF data, we obtain the most precise value of this ratio at CDF, and discuss the prospects for a corresponding measurement at LHCb.

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。

↑