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- W2137277469 abstract "We investigate the dependence of the Drell-Yan cross section on lepton polar and azimuthal angles, as generated by the lowest-order QCD annihilation and Compton processes. We focus, in particular, on the azimuthal-angular distributions, which are of the form $mathrm{cos}ensuremath{phi}$ and $mathrm{cos}2ensuremath{phi}$. At small transverse momentum ${q}_{T}$ of the lepton pair, ${q}_{T}ensuremath{ll}Q$, with $Q$ the pair mass, these terms are known to be suppressed relative to the $ensuremath{phi}$-independent part of the Drell-Yan cross section by one or two powers of the transverse momentum. Nonetheless, as we show, like the $ensuremath{phi}$-independent part they are subject to large logarithmic corrections, whose precise form, however, depends on the reference frame chosen. These logarithmic contributions ultimately require resummation to all orders in the strong coupling. We discuss the potential effects of resummation on the various angular terms in the cross section and on the Lam-Tung relation." @default.
- W2137277469 created "2016-06-24" @default.
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- W2137277469 date "2006-07-06" @default.
- W2137277469 modified "2023-10-16" @default.
- W2137277469 title "Drell-Yan lepton angular distribution at small transverse momentum" @default.
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- W2137277469 doi "https://doi.org/10.1103/physrevd.74.014004" @default.
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