来自 LCSR 的 \( {\overline{B}}_s^0\to {D}_s^{+}{pi}\^{-}) 和 \( {\overline{B}}^0\to {D}^{+}{K}^{-}\) 衰变中的不可因子效应

IF 5 1区 物理与天体物理 Q1 PHYSICS, PARTICLES & FIELDS
Maria Laura Piscopo, Aleksey V. Rusov
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引用次数: 0

摘要

鉴于目前基于 QCD 因子化(QCDF)的最新预测与几种非轻子颜色允许的双体 B 介子衰变的实验数据之间的差异、我们利用光锥和规则(LCSR)框架,通过合适的三点相关函数和B-介子光锥分布振幅,得到了不可因子软胶子对衰变\( {\overline{B}}_s^0\to {D}_s^{+}{pi}^{-}\) 和\( {\overline{B}}^0\to {D}^{+}{K}^{-}\) 的贡献的新测定。我们特别讨论了相关器的双光锥(LC)展开相关问题,并激励未来在胶子和旁观夸克沿不同光锥方向对齐的情况下确定三粒子B介子矩阵元素。在对相关函数进行 LC 局部算子乘积展开时,我们发现,对于所考虑的两种模式,振幅的不可因子部分都是可观的正值,但系统不确定性非常大。此外,我们还首次利用 LCSR 确定了 LO-QCD 下的可因子振幅,以及相应的分支分数。我们的预测与实验数据一致,也与基于 QCDF 的结果一致,但同样存在非常大的不确定性。在这方面,我们为未来的改进和研究提供了丰富的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Non-factorisable effects in the decays \( {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} \) and \( {\overline{B}}^0\to {D}^{+}{K}^{-} \) from LCSR

In light of the current discrepancies between the recent predictions based on QCD factorisation (QCDF) and the experimental data for several non-leptonic colour-allowed two-body B-meson decays, we obtain new determinations of the non-factorisable soft-gluon contribution to the decays \( {\overline{B}}_s^0\to {D}_s^{+}{\pi}^{-} \) and \( {\overline{B}}^0\to {D}^{+}{K}^{-} \), using the framework of light-cone sum rule (LCSR), with a suitable three-point correlation function and B-meson light-cone distribution amplitudes. In particular, we discuss the problem associated with a double light-cone (LC) expansion of the correlator, and motivate future determinations of the three-particle B-meson matrix element with the gluon and the spectator quark aligned along different light-cone directions. Performing a LC-local operator product expansion of the correlation function, we find, for both modes considered, the non-factorisable part of the amplitude to be sizeable and positive, however, with very large systematic uncertainties. Furthermore, we also determine for the first time, using LCSR, the factorisable amplitudes at LO-QCD, and thus the corresponding branching fractions. Our predictions are in agreement with the experimental data and consistent with the results based on QCDF, although again within very large uncertainties. In this respect, we provide a rich outlook for future improvements and investigations.

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来源期刊
Journal of High Energy Physics
Journal of High Energy Physics PHYSICS, PARTICLES & FIELDS-
CiteScore
10.00
自引率
46.30%
发文量
2107
审稿时长
12 weeks
期刊介绍: The aim of the Journal of High Energy Physics (JHEP) is to ensure fast and efficient online publication tools to the scientific community, while keeping that community in charge of every aspect of the peer-review and publication process in order to ensure the highest quality standards in the journal. Consequently, the Advisory and Editorial Boards, composed of distinguished, active scientists in the field, jointly establish with the Scientific Director the journal''s scientific policy and ensure the scientific quality of accepted articles. JHEP presently encompasses the following areas of theoretical and experimental physics: Collider Physics Underground and Large Array Physics Quantum Field Theory Gauge Field Theories Symmetries String and Brane Theory General Relativity and Gravitation Supersymmetry Mathematical Methods of Physics Mostly Solvable Models Astroparticles Statistical Field Theories Mostly Weak Interactions Mostly Strong Interactions Quantum Field Theory (phenomenology) Strings and Branes Phenomenological Aspects of Supersymmetry Mostly Strong Interactions (phenomenology).
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