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A determination of the Lambda parameter from full lattice QCD

Göckeler, M.; Horsley, R.; Irving, A.C.; Pleiter, D.; Rakow, P.E.L.; Schierholz, G. and Stüben, H. (2006) A determination of the Lambda parameter from full lattice QCD. Physical Review D, 73 . Article Number: 014513. ISSN 1550-2368 (online); 1550-7998 (print)

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Official URL: http://link.aps.org/abstract/PRD/v73/e014513

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.

Item Type:Article
Additional Information:LTH 647; arXiv Number: arXiv:hep-ph/0502212v2. Additional citation information: PHYSICAL REVIEW D 73, 014513 (2006); 1550-7998/2006/73(1)/014513(13). 13 pages. Published 23 January 2006. Issue: January 2006.
Uncontrolled Keywords:STRONG-COUPLING CONSTANT; WILSON FERMIONS; BETA-FUNCTION; QUANTUM CHROMODYNAMICS; GAUGE-THEORIES; QUARK MASSES; ALPHA(S); IMPROVEMENT; RENORMALIZATION; COMPUTATION
Subjects:Q Science > QC Physics
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences
DOI:10.1103/PhysRevD.73.014513
Related URLs:
Refereed:Yes
Status:Published
ID Code:423
Deposited On:31 Oct 2008 09:57
Last Modified:05 Mar 2012 10:36

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