Universality of the Collins-Soper-Sterman nonperturbative function in gauge boson production
arXiv:hep-ph/0506225 · doi:10.1016/j.physletb.2005.12.063
Abstract
We revise the $b_*$ model for the Collins-Soper-Sterman resummed form factor to improve description of the leading-power contribution at nearly nonperturbative impact parameters. This revision leads to excellent agreement of the transverse momentum resummation with the data in a global analysis of Drell-Yan lepton pair and Z boson production. The nonperturbative contributions are found to follow universal quasi-linear dependence on the logarithm of the heavy boson invariant mass, which closely agrees with an estimate from the infrared renormalon analysis.
published version; 14 pages, 4 figures, additional discussion