Drell-Yan process with jet vetoes: breaking of generalized factorization

被引:34
|
作者
Zeng, Mao [1 ]
机构
[1] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA
来源
JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 10期
基金
美国国家科学基金会;
关键词
Resummation; QCD; SCATTERING;
D O I
10.1007/JHEP10(2015)189
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Resummation of hadron collision cross sections, when the measurement imposes a hierarchy of scales, relies on factorization. Cancellation of Glauber/Coulomb gluons is a necessary condition for factorization. For Drell-Yan-like processes, the known proofs of cancellation of Glauber gluons are not applicable when jet vetoes are introduced, via jet algorithms or event shape variables such as the beam thrust. A priori, this does not rule out the possibility that an unknown new cancellation mechanism exists, or the possibility that a generalized factorization formalism is correct. To resolve the questions, we construct a direct counter-example in QCD with scalar quarks, contradicting any form of factorization in which the two collinear sectors are decoupled from each other. In the counter-example, decoupling of the two collinear sectors implies zero dependence of the beam thrust distribution on the longitudinal spin of the incoming hadrons, but we find a non-zero spin asymmetry at leading power due to Glauber gluons exchanged between spectators. We discuss implications for resumming large logarithms from jet vetoes.
引用
收藏
页数:22
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