Single Transverse Spin Asymmetries at Parton Level
Single Transverse Spin Asymmetries at Parton Level
复制标题
帕顿能级单横向自旋不对称
DOI:
10.1088/0253-6102/53/2/21
复制
发表时间:
2009-01
影响因子:
3.1
通讯作者:
Sang Hua-Zheng
中科院分区:
文献类型:
--
作者:
Cao Hui-Geng;Ma Jian-Ping;Sang Hua-Zheng
Two factorization approaches have been proposed for single transverse spin asymmetries. One is the collinear factorization, another is the transverse-momentum-dependent factorization. They have been previously derived in a formal way by using diagram expansion at hadron level. If the two factorizations hold or can be proven, they should also hold when we replace hadrons with parton states. We examine these two factorizations at parton level with massless partons. It is nontrivial to generate these asymmetries at parton level with massless partons because the asymmetries require helicity-flip and nonzero absorptive parts in scattering amplitudes. By constructing suitable parton states with massless partons we derive the two factorizations for the asymmetry in Drell-Yan processes. It is found from our results that the collinear factorization derived at parton level is not the same as that derived at hadron level. Our results with massless partons confirm those derived with single massive parton state in our previous works.
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影响因子:
5
作者:
J. Qiu;G. Sterman
通讯作者:
J. Qiu;G. Sterman
DOI:
10.1016/j.nuclphysb.2006.11.016
发表时间:
2006-10
期刊:
Nuclear Physics
影响因子:
--
作者:
H. Eguchi;Y. Koike;Kazuhiro Tanaka
通讯作者:
H. Eguchi;Y. Koike;Kazuhiro Tanaka
影响因子:
5
作者:
C. Bomhof;P. Mulders;W. Vogelsang;F. Yuan
通讯作者:
C. Bomhof;P. Mulders;W. Vogelsang;F. Yuan
影响因子:
4.4
作者:
Y. Kanazawa;Y. Koike
通讯作者:
Y. Kanazawa;Y. Koike
DOI:
10.1103/physrevd.78.014024
发表时间:
2008-01
期刊:
Lawrence Berkeley National Laboratory
影响因子:
--
作者:
F. Yuan
通讯作者:
F. Yuan