RT Journal Article
T1 Preliminary calculation of αs from Green functions with dynamical quarks
A1 Boucaud, Philippe
A1 Leroy, Jean Pierre
A1 Micheli, Jacques
A1 Pène, Olivier
A1 Moutarde, Hervé
A1 Roiesnel, Claude
A1 Rodríguez Quintero, José
AB We present preliminary results on the computation of the QCD running cou-pling constant in the ^MOM scheme and Landau gauge with two flavours of dynamicalWilson quarks. Gluon momenta range up to about 7GeV (β = 5.6, 5.8 and 6.0) with aconstant dynamical-quark mass. This range already allows to exhibit some evidence fora 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 theconclusions of our quenched study, we take into account 1/μ2 correction to the asymptoticbehaviour. We find ¤Nf=2MS= 264(27)MeV × [a−1(5.6, 0.1560)/2.19GeV], which leads toαs(MZ) = 0.113(3)(4). The latter result has to be taken as a preliminary indication ratherthan a real prediction in view of the systematic errors still to be controlled. Still, beingtwo sigmas below the experimental result makes it very encouraging.
SN 1126-6708
YR 2002
FD 2002-01
LK http://hdl.handle.net/10272/18767
UL http://hdl.handle.net/10272/18767
LA eng
NO Boucaud, 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).
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026