Resummation of non-global QCD observables

被引：370

作者：

Dasgupta, M

Salam, GP

机构：

[1] DESY, Theory Grp, D-2000 Hamburg, Germany

[2] CERN, Div TH, CH-1211 Geneva 23, Switzerland

[3] Univ Paris 06, LPTHE, Paris, France

[4] Univ Paris 07, Paris, France

来源：

PHYSICS LETTERS B | 2001年 / 512卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(01)00725-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss issues related to the resummation of non-global observables in QCD, those that are sensitive to radiation in only a part of phase space. Examples of such observables are certain single-hemisphere event shapes in e(+)e(-) and DIS. Compared to global observables (those sensitive to all emissions, e.g., the e(+)e(-) thrust) a new class of single-logarithmic terms arises. These have been neglected in recent calculations in the literature. For a whole set of single hemisphere e(+)e(-) and DIS event, shapes, we analytically evaluate the first such term, at order alpha (2)(s), and give numerical results for the resummation of these terms in the large-N-C limit. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：323 / 330

页数：8