QCD study of B meson decays: investigation of dynamical gluon effects inside B meson

B介子衰变的QCD研究：B介子内部动态胶子效应的研究

• 批准号: 16540266
• 负责人: TANAKA Kazuhiro
• 金额: $ 1.86万
• 依托单位: Juntendo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540266/
• 关键词: B meson; decay; QCD; light-cone wave function; shape function; heavy quark; gluon; HQET; 重いクォーク

The lightcone wavefunction (WF) and the shape function (SF) for B meson are indispensable for theoretical calculation of B-meson decay rates. We developed systematic investigation of WF and SF based on QCD, including effects induced by dynamical gluons inside B meson. We computed QCD radiative corrections for WF and SF, respectively, inserting the corresponding operators into off-shell Green functions. Our results reproduced the singular behavior, noticed in the literature, and revealed: the singular behavior arises not only for on-shell but also for off-shell cases; the structure of ultra-violet divergence is completely different from that of infra-red divergence; the relevant infra-red behavior is associated with "soft modes", as matrix elements of local operators. Based on this observation, we performed the decomposition of WF, SF into the short-and long-distance components, using the operator product expansion. The short-distance Wilson coefficients are calculated to one-loop accur … More acy in the MS-scheme, while the long-distance components are expressed by a complete set of local operators. Using QCD equations of motion, the operators of dimension five and six can be exactly reexpressed in terms of explicit dynamical gluon, i.e., as the quark-antiquark-gluon operators, whose matrix elements were already estimated from QCD sum rules. The Wilson coefficients contain the double logarithms of renormalization scale; namely, taking dynamical gluon effects into account, the WF, SF are governed by the "two-step" renormalization-group evolution, associated with the cusp anomalous dimension, and with the anomalous dimensions of local operators. (Before completing research, Professor Kodaira died suddenly. Because of this great loss, some of this research are yet unpublished or unsolved. These will be completed by the head investigator.) As other model cases where dynamical gluons play essential roles. we paid attention to mechanisms associated with dynamical gluons in hard processes with polarized hadron beams, and developed the corresponding QCD predictions. Less

基于QCD的WF和SF BAS的B-Meson衰减速率的形状功能（SF）的灯泡函数（SF），我们计算了BMeson内部动态glus的效果。 ，将相对操作员插入脱壳绿色功能。红色差异; Ehaviol与“软模式”相关，作为本地运算符的矩阵元素。在MS-Scheme中，虽然长距离组件是由竞争的本地运营商表示的。总和。威尔逊系数包含重新归化的双对数；在这种损失的情况下，有些人尚未公开或未能解决。

项目成果

QCD prediction of A_<TT> for small Q_T dimuon production in pp and p anti-p collisions

pp 和 p 反 p 碰撞中小 Q_T dimuon 产生的 A_<TT> 的 QCD 预测

• 发表时间: 2007
• 期刊: American Institute of Physics Conference Proceedings 915(印刷中)
• 作者: T.Kai;H.Kozaki;K.Nakao;Y.Nambu;W.Bentz;Hiroyuki Kawamura
• 通讯作者: Hiroyuki Kawamura

Radiative corrections and enhanced power corrections for the shape function in inclusive B decays

包含 B 衰变中形状函数的辐射校正和增强功率校正

• 发表时间: 2006
• 期刊: Nuclear Physics B (Proc.Suppl.) 157
• 作者: H.Fukaya;T.Onogi;S.Hashimoto;T.Hirohashi;K.Ogawa;H.Kawamura
• 通讯作者: H.Kawamura

The dilepton Q_T spectrum in transversely polarized Drell-Yan process in QCD

QCD中横向偏振Drell-Yan过程中的双轻子Q_T谱

• 发表时间: 2006
• 期刊: Progress of Theoretical Physics 115・No.3(掲載予定)
• 作者: S.Negishi;H.Matsufuru;T.Onogi;T.Umeda;H.Kawamura;若松 正志;K.Terasaki;H.Kawamura
• 通讯作者: H.Kawamura

Master formula for twist-3 soft-gluon-pole mechanism to single transverse-spin asymmetry

• DOI: 10.1016/j.physletb.2007.01.044
• 发表时间: 2006-12
• 期刊: Physics Letters B
• 影响因子: 4.4
• 作者: Y. Koike;Kazuhiro Tanaka

Soft gluon corrections to double transverse-spin asymmetries for small-Q_T dilepton production at RHIC and J-PARC

在 RHIC 和 J-PARC 上对小 Q_T 双轻子产生的双横向自旋不对称性进行软胶子校正

• 发表时间: 2007
• 期刊: Nuclear Physics B (accepted)(印刷中)
• 作者: Th.A. Rijken;Y. Yamamoto;Hiroyuki Kawamura
• 通讯作者: Hiroyuki Kawamura