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QCD factorized Drell-Yan cross-section at large transverse momentum

Jul, 2001

36 pages

Published in:

Phys.Rev.D 65 (2002) 034006

e-Print:

hep-ph/0107309 [hep-ph]

DOI:

10.1103/PhysRevD.65.034006

Report number:

ANL-HEP-01-057

View in:

ADS Abstract Service

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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_T\sim 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_T\gg Q

, and we argue that perturbative expansions are more stable and reliable in terms of the modified factorization formula.

hadron hadron: inclusive reaction
anti-p p: inclusive reaction
p p: inclusive reaction
lepton: pair production
Drell-Yan process
momentum transfer: high
quantum chromodynamics: factorization
perturbation theory: higher-order
photon: fragmentation function
off-shell

References(36)

Figures(0)

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