期刊
PHYSICS LETTERS B
卷 704, 期 4, 页码 276-283出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.09.005
关键词
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资金
- SNSF
- SUK
- BMBF [05H09UME]
- DFG [NE 398/3-1]
- Research Center Elementary Forces and Mathematical Foundations
Jet broadening is an event-shape variable probing the transverse momenta of particles inside jets. It has been measured precisely in e(+)e(-) annihilations and is used to extract the strong coupling constant. The factorization of the associated cross section at small values of the broadening is afflicted by a collinear anomaly. Based on an analysis of this anomaly, we present an all-order factorization theorem for jet-broadening distributions, which is free of large perturbative logarithms in the two-jet limit. Our formula reproduces known results at next-to-leading logarithmic order but also extends to higher orders. (C) 2011 Elsevier B.V. All rights reserved.
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