Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-06-11
Phys.Rev. D70 (2004) 074013
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 8 figures, An improved, slightly more precise NLL resummation is used and the figures are updated accordingly. The c
Scientific paper
10.1103/PhysRevD.70.074013
The transverse momentum distribution of soft hadrons and jets that accompany central hard-scattering production at hadron colliders is of great importance, since it has a direct bearing on the ability to separate new physics signals from Standard Model backgrounds. We compare the predictions for the gluonic k_t-distribution using two different approaches: resummed NLL BFKL and DGLAP evolution. We find that as long as the initial and final virtualities (k_t) along the emission chain are not too close to each other, the NLL resummed BFKL results do not differ significantly from those obtained using standard DGLAP evolution. The saturation momentum Q_s(x), calculated within the resummed BFKL approach, grows with 1/x even slower than in the leading-order DGLAP case.
Khoze Valery A.
Martin A. D.
Ryskin M. G.
Stirling James W.
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