Upsilon production at the Tevatron and the LHC

Details Upsilon production at the Tevatron and the LHC Upsilon production at the Tevatron and the LHC

2008-06-19

arxiv.org/abs/0806.3282v2

Phys.Rev.Lett.101:152001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.101.152001

We update the theoretical predictions for direct Y(nS) hadroproduction in the framework of NRQCD. We show that the next-to-leading order corrections in alpha_s to the color-singlet transition significantly raise the differential cross section at high pT and substantially affect the polarization of the Upsilon. Motivated by the remaining gap between the NLO yield and the cross section measurements at the Tevatron, we evaluate the leading part of the alpha_s^5 contributions, namely those coming from Y(nS) associated with three light partons. The differential color-singlet cross section at alpha_s^5 is in substantial agreement with the data, so that there is no evidence for the need of color-octet contributions. Furthermore, we find that the polarization of the Y(nS) is longitudinal. We also present our predictions for Y(nS) production at the LHC.

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