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Unintegrated parton distributions and electroweak boson production at hadron colliders

G. Watt·A. D. Martin·M. G. Ryskin
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Abstract

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.

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G. Watt, A. D. Martin, M. G. Ryskin. 2004-11-09. Unintegrated parton distributions and electroweak boson production at hadron colliders. https://doi.org/10.1103/physrevd.70.014012%2010.1103%2Fphysrevd.70.079902

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