QCD因子化方案中twist-3波函数和红外发散问题  

Infrared Divergence and Twist-3 Wave Functions in QCD Factorization for B→P Decays

作　　者：杜东生[1] 

机构地区：[1]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2002年第z1期11-15,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金资助

摘　　要：在QCD因子化框架下讨论了B介子到两个轻赝标介子衰变中手征增强的修正问题.证明了只有在twist-3波函数对称的情况下,顶角修正的红外发散才能相消。因而只有在这种情况下,手征增强的修正才能自洽地被包含进来.作者还对旁观者硬散射中出现的发散进行了讨论.The problem of chirally enhanced corrections for B decays into two light pseudos-calars in QCD factorization scheme is discussed. We find that the infrared divergences of the vertex corrections cancel only if the twist-3 wave functions are symmetric. In that case chirally enhanced corrections can be included consistently. The divergences appeared in the hard spectator scattering are also discussed briefly.

关 键 词：B介子衰变 QCD因子化 红外发散 twist-3波函数 

分 类 号：O572.331[理学—粒子物理与原子核物理]