Boucaud, PhilippeLeroy, Jean PierreMicheli, JacquesPène, OlivierMoutarde, HervéRoiesnel, ClaudeRodríguez Quintero, José2020-10-022020-10-022002-01Boucaud, P., Leroy, J. P., Micheli, J., Pène, O., Moutarde, H., Roiesnel, C. & Rodríguez Quintero, J. (2002). Preliminary calculation of αs from Green functions with dynamical quarks. Journal of high energy physics : JHEP. , 2002, (1) (046).1126-6708http://hdl.handle.net/10272/18767We present preliminary results on the computation of the QCD running cou- pling constant in the ^MOM scheme and Landau gauge with two flavours of dynamical Wilson quarks. Gluon momenta range up to about 7GeV (β = 5.6, 5.8 and 6.0) with a constant dynamical-quark mass. This range already allows to exhibit some evidence for a sizable 1/μ2 correction to the asymptotic behaviour, as in the quenched approximation, although a fit without power corrections is still possible with a reasonable χ2. Following the conclusions of our quenched study, we take into account 1/μ2 correction to the asymptotic behaviour. We find ¤ Nf=2 MS = 264(27)MeV × [a−1(5.6, 0.1560)/2.19GeV], which leads to αs(MZ) = 0.113(3)(4). The latter result has to be taken as a preliminary indication rather than a real prediction in view of the systematic errors still to be controlled. Still, being two sigmas below the experimental result makes it very encouraging.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Nonperturbative EffectsQuark Masses and SM parametersQCDLattice QCDjournal articleopen access