What does the W transverse momentum distribution say about the W+1 jet/W+0 jet ratio?

Details What does the W transverse momentum distribution say about the W+1 jet/W+0 jet ratio? What does the W transverse momentum distribution say about the W+1 jet/W+0 jet ratio?

1997-07-25

arxiv.org/abs/hep-ph/9707469v1

Phys.Lett.B419:363-368,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, uses epsfig.sty

Scientific paper

10.1016/S0370-2693(97)01461-5

We compute the W transverse momentum distribution at large transverse momentum at fixed next-to-leading order (i.e. O(alpha_s^2) and find good agreement with the preliminary measurements reported by D0. We find that the W transverse momentum distribution is typically significantly larger than the exclusive one-jet rate for a given value of p_T^W or E_T^jet, mainly because two or more jet events are excluded. As a consequence, we find that theoretically the W+1 jet to W+0 jet ratio R^10 is smaller than the analogous quantity defined in terms of p_T^W, R^W. This hierarchy is preserved under changes of renormalisation/factorisation scales, strong coupling constant and jet algorithm. However, this appears to be in contradiction with the preliminary experimental results which suggest R^10 > R^W.

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