Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-09-09
Phys.Rev. D70 (2004) 014012; Erratum-ibid. D70 (2004) 079902
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 8 figures. Version to appear in Phys. Rev. D; correction to Higgs P_T distribution made in Erratum
Scientific paper
10.1103/PhysRevD.70.014012
We describe the use of doubly-unintegrated parton distributions in hadron-hadron collisions, using the (z,k_t)-factorisation prescription where the transverse momentum of the incoming parton is generated in the last evolution step. We apply this formalism to calculate the transverse momentum (P_T) distributions of produced W and Z bosons and compare the predictions to Tevatron Run 1 data. We find that the observed P_T distributions can be generated almost entirely by the leading order q_1 q_2 -> W,Z subprocesses, using known and universal doubly-unintegrated quark distributions. We also calculate the P_T distribution of the Standard Model Higgs boson at the LHC, where the dominant production mechanism is by gluon-gluon fusion.
Martin A. D.
Ryskin M. G.
Watt George
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