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NNLO corrections to massive lepton-pair production in longitudinally polarized proton-proton collisions | | V. Ravindran
; J. Smith
; W.L. van Neerven
; | | Date: |
24 Nov 2003 | | Journal: | Nucl.Phys. B682 (2004) 421-456 DOI: 10.1016/j.nuclphysb.2004.01.001 | | Subject: | hep-ph | | Abstract: | We present the full next-to-next-to-leading order (NNLO) coefficient functions for the polarized cross section $dDelta sigma/dQ$ for the Drell-Yan process $p + p o l^+l^- + ’X’$. Here $’X’$ denotes any inclusive hadronic state and $Q$ represents the invariant mass of the lepton pair. All QCD partonic subprocesses have been included provided the lepton pair is created by a virtual photon, which is a valid approximation for $Q<50$ GeV. Unlike the differential distribution w.r.t. transverse momentum the dominant subprocess for the integrated cross section is given by $q+ar q o gamma^* + ’X’$ and its higher order corrections so that massive lepton pair production provides us with an excellent tool to measure the polarized anti-quark densities. Our calculations are carried out using the method of $n$-dimensional regularization by making a special choice for the $gamma_5$ matrix. We give predictions for double longitudinal spin asymmetry measurements at the RHIC. | | Source: | arXiv, hep-ph/0311304 | | Services: | Forum | Review | PDF | Favorites | |
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