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2 results on '"strong interaction [coupling constant]"'

1. Determination of the Lambda parameter from full lattice QCD

Author

M. Göckeler, Roger Horsley, H. Stüben, Alan C. Irving, Dirk Pleiter, Paul E.L. Rakow, and Gerrit Schierholz

Subjects
Nuclear and High Energy Physics, Particle physics, strong interaction [coupling constant], High Energy Physics::Lattice, SU(3) [gauge field theory], Lattice field theory, FOS: Physical sciences, Quenched approximation, Lambda, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Lattice, Lattice gauge theory, ddc:530, continuum limit, lattice field theory [fermion], Physics, Quantum chromodynamics, Coupling constant, beta function [renormalization], High Energy Physics - Lattice (hep-lat), High Energy Physics::Phenomenology, Monte Carlo [numerical calculations], Fermion, Lattice QCD, Lambda parameter, High Energy Physics - Phenomenology, quenching [approximation], High Energy Physics::Experiment, 2 [flavor]
Abstract

We present a determination of the QCD parameter Lambda in the quenched approximation (n_f=0) and for two flavours (n_f=2) of light dynamical quarks. The calculations are performed on the lattice using O(a) improved Wilson fermions and include taking the continuum limit. We find Lambda_{n_f=0} = 259(1)(20) MeV and Lambda_{n_f=2} = 261(17)(26) MeV}, using r_0 = 0.467 fm to set the scale. Extrapolating our results to five flavours, we obtain for the running coupling constant at the mass of the Z boson alpha_s(m_Z) = 0.112(1)(2). All numbers refer to the MSbar scheme., 25 pages, 9 figures

Published
2006

2. Experimental Evidence on QCD

Author

P. Soding and G. Wolf

Subjects
VALIDITY TEST [QUANTUM CHROMODYNAMICS], FRAGMENTATION [QUARK], II-d-7 [inspirereview], HADRONIC DECAY [UPSILON(9460)], High Energy Physics::Lattice, Electron–positron annihilation, EXPERIMENTAL RESULTS [REVIEW], Nuclear Theory, SPECTRUM [SPHERICITY], BIBLIOGRAPHY, SPHERICITY [SPECTRUM], SPECTRUM [THRUST], ANGULAR DEPENDENCE [DIFFERENTIAL CROSS SECTION], ELECTROPRODUCTION [HADRON], Nuclear Experiment, ENERGY DEPENDENCE [TOTAL CROSS SECTION], Physics, Quantum chromodynamics, HADRON [ELECTROPRODUCTION], DEEP INELASTIC SCATTERING [LEPTON NUCLEON], JET [ELECTROPRODUCTION], VIOLATION [SCALING], ENERGY DEPENDENCE [TRANSVERSE MOMENTUM], COLLIDING BEAMS [ELECTRON POSITRON], Quarkonium, RATIO [TOTAL CROSS SECTION], FINAL STATE [(3JET)], ELECTRON POSITRON [ANNIHILATION], THREE-GLUON [EXCHANGE], FRAGMENTATION [GLUON], ANNIHILATION [ELECTRON POSITRON], ELECTROPRODUCTION [JET], +%28N%29HADRON%22">ELECTRON POSITRON --> (N)HADRON, DECAY WIDTH [VECTOR MESON], STRUCTURE FUNCTION [MOMENTUM TRANSFER], Quark, Nuclear and High Energy Physics, Particle physics, QUARKONIUM [QUARK], +3GLUON%22">UPSILON(9460) --> 3GLUON, DIFFERENTIAL CROSS SECTION [ANGULAR DEPENDENCE], LEPTON NUCLEON [DEEP INELASTIC SCATTERING], TOTAL CROSS SECTION [RATIO], COUPLING CONSTANT [STRONG INTERACTION], TRANSVERSE MOMENTUM [DIFFERENTIAL CROSS SECTION], Inelastic scattering, EXCHANGE [THREE-GLUON], Nuclear physics, (3JET) [FINAL STATE], TOTAL CROSS SECTION [ENERGY DEPENDENCE], ddc:530, STRONG INTERACTION [COUPLING CONSTANT], THRUST [SPECTRUM], UPSILON(9460) [HADRONIC DECAY], VECTOR MESON [DECAY WIDTH], High Energy Physics::Phenomenology, Quark model, ELECTRON POSITRON [COLLIDING BEAMS], Deep inelastic scattering, Gluon, STRUCTURE FUNCTION [MOMENT], DIFFERENTIAL CROSS SECTION [TRANSVERSE MOMENTUM], High Energy Physics::Experiment, INTERPRETATION OF EXPERIMENTS
Abstract

Evidence for the quark composition of hadrons is reviewed including deep inelastic lepton-nulceon scattering, e/sup +/e/sup -/ annihilation, and gluon fragmentation. (AIP)

Published
1981
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