arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0808.3791hep-ph
收藏

重到轻形状因子的光锥扩展

Light-cone expansion of heavy-to-light form factors

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

摘要:

本文介绍了我们最近对标量成分模型中重-轻跃迁形状因子的光锥展开的系统研究结果[1]。我们证明了高扭转贡献(在本模型中由光锥效应表示)在1/m_Q展开中具有相同的行为。与较低扭转贡献相比,较高扭转贡献的抑制参数通常是逆波莱尔参数β。这里唯一的例外是前导扭转和次前导扭转的情况:由于前导扭转对形状因子的贡献的额外抑制,它们在1/β中具有相同的阶数。

英文摘要:

We present the results of our recent systematic study of the light-cone expansion of heavy-to-light transition form factors in a model with scalar constituents [1]. We show that the higher-twist contributions (represented in this model by off-light-cone effects) all have the same behaviour in the 1/m_Q expansion. The suppression parameter of the higher-twist contributions compared to the lower-twist contributions is, in general, the inverse Borel parameter β. The only exception here is the case of the leading and the subleading twists: they are of the same order in 1/βbecause of an extra suppression of the leading-twist contribution to the form factor.

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。

↑