Computation of the strong coupling in QCD with two dynamical flavours

Michele Della Morte, Roberto Frezzotti, Jochen Heitger, Juri Rolf, Rainer Sommer, Ulli Wolff

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.
OriginalsprogUdefineret/Ukendt
TidsskriftNuclear Physics B
DOI
StatusUdgivet - 19. nov. 2004

Bibliografisk note

34 pages including figures and tables, latex2e

Emneord

  • hep-lat
  • hep-ph

Citer dette

Morte, Michele Della ; Frezzotti, Roberto ; Heitger, Jochen ; Rolf, Juri ; Sommer, Rainer ; Wolff, Ulli. / Computation of the strong coupling in QCD with two dynamical flavours. I: Nuclear Physics B. 2004.
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Computation of the strong coupling in QCD with two dynamical flavours. / Morte, Michele Della; Frezzotti, Roberto; Heitger, Jochen; Rolf, Juri; Sommer, Rainer; Wolff, Ulli.

I: Nuclear Physics B, 19.11.2004.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Computation of the strong coupling in QCD with two dynamical flavours

AU - Morte, Michele Della

AU - Frezzotti, Roberto

AU - Heitger, Jochen

AU - Rolf, Juri

AU - Sommer, Rainer

AU - Wolff, Ulli

N1 - 34 pages including figures and tables, latex2e

PY - 2004/11/19

Y1 - 2004/11/19

N2 - We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.

AB - We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.

KW - hep-lat

KW - hep-ph

U2 - 10.1016/j.nuclphysb.2005.02.013

DO - 10.1016/j.nuclphysb.2005.02.013

M3 - Tidsskriftartikel

JO - Nuclear Physics, Section B

JF - Nuclear Physics, Section B

SN - 0550-3213

ER -