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QCD Factorized Drell-Yan Cross Section at Large Transverse Momentum | | Edmond L. Berger
; Jianwei Qiu
; Xiaofei Zhang
; | | Date: |
30 Jul 2001 | | Journal: | Phys.Rev. D65 (2002) 034006 | | Subject: | hep-ph hep-ex nucl-th | | Affiliation: | Argonne), Jianwei Qiu, Xiaofei Zhang (Iowa State | | Abstract: | We derive a new factorization formula in perturbative quantum chromodynamics for the Drell-Yan massive lepton-pair cross section as a function of the transverse momentum $Q_T$ of the pair. When $Q_T$ is much larger than the pair’s invariant mass $Q$, this factorization formula systematically resums the logarithmic contributions of the type $alpha_s^m ln^m(Q_T^2/Q^2)$ to all orders in the strong coupling $alpha_s$. When $Q_Tsim Q$, our formula yields the same Drell-Yan cross section as conventional fixed order QCD perturbation theory. We show that resummation is important when the collision energy $sqrt{S}$ is large enough and $Q_Tgg Q$, and we argue that perturbative expansions are more stable and reliable in terms of the modified factorization formula. | | Source: | arXiv, hep-ph/0107309 | | Services: | Forum | Review | PDF | Favorites | |
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