New determination of the nonperturbative form factor in QCD transverse-momentum resummation for vector boson production.

Masanori Hirai, Hiroyuki Kawamura & Kazuhiro Tanaka
In the $b_*$ model for the Collins-Soper-Sterman (CSS) resummation, the resummed form factor is accompanied by the nonperturbative gaussian form factor, which is known to exhibit strong dependence on the the vector boson mass. The nonperturbative form factor of similar nature arises in another approach for the CSS resummation, the ``minimal prescription (MP)'' based on analytic continuation to treat the impact parameter transform. We perform a global fit of the nonperturbative form factor in the...