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