{"arxiv_id":"hep-ph/0502212","title":"A Determination of the Lambda Parameter from Full Lattice QCD","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.","primary_cat":"hep-ph","cross_cats":["hep-lat"],"submitted_at":"2005-02-22T19:53:16+00:00","latest_version":2,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"HIGH","one_line_summary":"Lattice simulations of QCD with two dynamical quark flavours give Lambda_MS = 261(17)(26) MeV and, after running to the Z mass, alpha_s(m_Z) = 0.112(1)(2), about two sigma below the experimental average.","novelty_score":4.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0.0,"inbound_count":25,"_links":{"html":"https://pith.science/paper/hep-ph/0502212","verdict":"/api/v1/verdicts/hep-ph/0502212"}}