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28 March 2024
 
  » arxiv » hep-ph/0311290

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Unintegrated CCFM parton distributions and transverse momentum of gauge bosons
J. Kwiecinski ; A. Szczurek ;
Date 22 Nov 2003
Journal Nucl.Phys. B680 (2004) 164-176 DOI: 10.1016/j.nuclphysb.2003.12.038
Subject hep-ph
AbstractTransverse momentum distribution of gauge bosons $W^{pm}$ and $Z^0$ is calculated using unintegrated parton distributions obtained by solving leading order CCFM equation(s) in the impact parameter space. For illustration we compare the results of the fixed-order collinear, soft-gluon resummation and CCFM approaches. A parameter of a nonperturbative form factor is adjusted to the D0 data. In contrast to the collinear approach, the leading order calculation based on the unintegrated CCFM parton distributions generates transverse momentum distributions of gauge bosons, which are almost consistent with experimental data provided the parameter of the nonperturbative form factor is appropriately adjusted. The $W^+$-$W^-$ asymmetry is calculated as a function of the boson rapidity and transverse momentum. Predictions are given for RHIC and LHC.
Source arXiv, hep-ph/0311290
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