Role of the nonperturbative input in QCD resummed Drell-Yan Q{sub T} distributions

Journal Article · Fri Jun 01 04:00:00 EDT 2001 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.63.114011· OSTI ID:40205134

Qiu, Jianwei; Zhang, Xiaofei

We analyze the role of the nonperturbative input in the Collins-Soper-Sterman (CSS) b-space QCD resummation formalism for Drell-Yan transverse momentum (Q{sub T}) distributions, and investigate the predictive power of the CSS formalism. We find that the predictive power of the CSS formalism has a strong dependence on the collision energy S in addition to its well-known Q{sup 2} dependence, and the S dependence improves the predictive power at collider energies. We show that a reliable extrapolation from perturbatively resummed b-space distributions to the nonperturbative large b region is necessary to ensure the correct Q{sub T} distributions. By adding power corrections to the renormalization group equations in the CSS formalism, we derive a new extrapolation formalism. We demonstrate that at collider energies the CSS resummation formalism plus our extrapolation has an excellent predictive power for W and Z production at all transverse momenta Q{sub T}{<=}Q. We also show that the b-space resummed Q{sub T} distributions provide a good description of Drell-Yan data at fixed target energies.

• Sponsoring Organization: (US)
• OSTI ID: 40205134
• Journal Information: Physical Review D, Journal Name: Physical Review D Journal Issue: 11 Vol. 63; ISSN 0556-2821
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EXTRAPOLATION
PRODUCTION
QUANTUM CHROMODYNAMICS
RENORMALIZATION
TARGETS
TRANSVERSE MOMENTUM