Factorization and resummation for jet broadening

Journal article

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. © 2011 Elsevier B.V.

Authors: Becher, T; Bell, G; Neubert, M

• Publication status: Published
• Journal: Physics Letters B
• Volume: 704
• Issue: 4
• Pages: 276-283
• Publication date: 2011-10-19
• DOI: 10.1016/j.physletb.2011.09.005
• ISSN: 0370-2693
• Language: English