Angular distribution of leptons from the decay of massive vector bosons

Details Angular distribution of leptons from the decay of massive vector bosons Angular distribution of leptons from the decay of massive vector bosons

2007-07-20

arxiv.org/abs/0707.3150v2

Phys.Lett.B656:74-78,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages; a few changes in wording; one reference added. Version in press at Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.09.008

We examine the transverse momentum $Q_\perp$ dependence of the helicity structure functions for massive vector bosons of mass $Q$ in hadron reactions. We demonstrate that large logarithmic terms of the form $\ln(Q/Q_\perp)$ in the helicity structure functions have the same origin as the logarithmic terms in the angular-integrated cross section and that they can be resummed to all orders in the strong coupling $\alpha_s$, in the same way as the angular-integrated cross section. As a consequence of current conservation, the resummed part of the helicity structure functions preserves the Lam-Tung relation as a function of $Q_\perp$ to all orders in $\alpha_s$.

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