Eur. Phys. J. C 24, 213-236 (2002)
DOI: 10.1007/s100520200915

Resummation of the jet broadening in DIS

M. Dasgupta¹ and G.P. Salam<sup>2, 3

1</sup>  DESY, Theory Group, Notkestrasse 85, Hamburg, Germany
²  CERN, TH Division, 1211 Geneva 23, Switzerland
³  LPTHE, Universités P. & M. Curie (Paris VI) et Denis Diderot (Paris VII), Paris, France

(Received: 16 October 2001 / Published online: 12 April 2002 - © Springer-Verlag / Società Italiana di Fisica 2002 )

Abstract
We calculate the leading and next-to-leading logarithmic resummed distribution for the jet broadening in deep inelastic scattering, as well as the power correction for both the distribution and mean value. A truncation of the answer at NLL accuracy, as is standard, leads to unphysical divergences. We discuss their origin and show how the problem can be resolved. We then examine DIS specific procedures for matching to fixed order calculations and compare our results to the data. One of the tools developed for the comparison is an NLO parton distribution evolution code. When compared to PDF sets from MRST and CTEQ it reveals limited discrepancies in both.

© Società Italiana di Fisica, Springer-Verlag 2002