Minimal subtraction and momentum subtraction in quantum chromodynamics at two-loop order

Journal Article · Tue Sep 01 00:00:00 EDT 1981 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.24.1369· OSTI ID:6248350

Braaten, E; Leveille, J P

The momentum-subtraction coupling constant ..cap alpha../sub MOM/ yields consistently smaller one-loop corrections to many quantum-chromodynamics (QCD) processes than the minimal-subtraction couplings ..cap alpha../sub MS/ and ..cap alpha../sub M/S. By shifting the renormalization scale ..mu.. of ..cap alpha../sub MS/(..mu..), we obtain a minimal-subtraction coupling with the same small one-loop corrections. It is shown, by studying the effective charges of QCD, that at two-loop order this coupling constant will continue to yield corrections to physical quantities that are comparable to those obtained by momentum subtraction. We also introduce a momentum-subtraction scheme which treats the triple-gluon, quark, and ghost vertices equally at one-loop order and is more convenient for higher-order calculations than the MOM scheme.

• Research Organization: Department of Physics, University of Wisconsin: Madison, Madison, Wisconsin 53706
• OSTI ID: 6248350
• Journal Information: Phys. Rev. D; (United States), Vol. 24:5
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
COUPLING CONSTANTS
ANNIHILATION
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
GAUGE INVARIANCE
GLUONS
GREEN FUNCTION
PROPAGATOR
QUANTUM ELECTRODYNAMICS
QUARKS
RENORMALIZATION
BASIC INTERACTIONS
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
FUNCTIONS
INTERACTIONS
INVARIANCE PRINCIPLES
LEPTON-LEPTON INTERACTIONS
PARTICLE INTERACTIONS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
645400* - High Energy Physics- Field Theory