Large perturbative corrections from gluon bremsstrahlung

Journal Article · Fri Oct 01 04:00:00 EDT 1982 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.26.1618· OSTI ID:7039314

Contogouris, A P

A new source of large corrections in perturbative QCD, arising from gluon bremsstrahlung, is identified and studied. These corrections are different from the so-called ..pi../sup 2/ terms arising from loop graphs in the soft-gluon limit. In one case (the total cross section for e/sup +/e/sup -/..-->..hadrons) large terms to O(..cap alpha../sub s/) from these two sources are shown to cancel each other, finally leaving a small correction. However, regarding the transverse-momentum (q/sub T/) distribution of ..pi../sup -/N..-->..l/sup +/l/sup -/+X (subprocess qq-bar..--> gamma..*g, corrections to O(..cap alpha../sub s/ /sup 2/)), the new source leads to a sizable K factor (approx.2) that significantly improves agreement with experiment; also, our result gives a simple explanation of the fact that this K factor is weakly dependent on q/sub T/. In large-p/sub T/ hadron production (subprocess qq..-->..qq) the new source leads to a large O(..cap alpha../sub s/ /sup 3/) correction as well. For the deep Compton effect (subprocess q..gamma -->..q..gamma..) no large corrections arise to O(..cap alpha../sub s/). Complete higher-order QCD calculations, whenever available, are compared with our simple results and discussed.

• Research Organization: Department of Physics, McGill University, Montreal, Canada
• OSTI ID: 7039314
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 26:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BASIC INTERACTIONS
BREMSSTRAHLUNG
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
GLUONS
HADRONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LINEAR MOMENTUM
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
RADIATIONS
TOTAL CROSS SECTIONS
TRANSVERSE MOMENTUM