Analytic Model for the QCD Running Coupling with Universal {bar {alpha}}{sub {ital s}} (0) Value

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.1209· OSTI ID:538595

Shirkov, D V; Solovtsov, I L ^[1]

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1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980 (Russia)

We discuss the new model expression {bar {alpha}}{sub an}( Q{sup 2}) recently obtained for the QCD running coupling with a regular ghost-free behavior in the {open_quotes}low Q{sup 2} {close_quotes} region. Being deduced from the standard {open_quotes}asymptotic-freedom{close_quotes} expression by imposing the Q{sup 2} analyticity{emdash}without any adjustable parameters{emdash}it has nice features: (i)The universal limiting value {bar {alpha}}{sub an}( 0)=4{pi}/{beta}{sub 0} expressed only via group symmetry factors and independent of experimental estimates on the running coupling {bar {alpha}}{sub s}(Q{sup 2}) (of QCD scale parameter {Lambda} ). This value is stable with respect to higher order corrections. (ii)Stability of IR behavior with respect to higher-loop effects. (iii)Coherence between the experimental {bar {alpha}}{sub an}( M{sup 2}{sub {tau}}) value and integral information on IR {bar {alpha}}{sub s}(Q{sup 2}) behavior as extracted from jet physics data. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538595
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANALYTICAL SOLUTION
COUPLING
MOMENTUM TRANSFER
PROPAGATOR
QUANTUM CHROMODYNAMICS
QUANTUM ELECTRODYNAMICS
SINGULARITY
STABILITY
VERTEX FUNCTIONS