First results on the running coupling in QCD with two massless flavours
| Autor: | Jochen Heitger, Juri Rolf, Bernd Gehrmann, Martin Hasenbusch, Stefan Kurth, Ulli Wolff, Peter Weisz, Hubert Simma, Roberto Frezzotti, Achim Bode, Hartmut Wittig, Stefan Sint, Karl Jansen, Rainer Sommer |
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| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
Coupling constant
Quantum chromodynamics Physics Coupling Particle physics Nuclear and High Energy Physics High Energy Physics - Lattice (hep-lat) Sampling (statistics) FOS: Physical sciences Observable Particle Physics - Lattice Lattice QCD Function (mathematics) Atomic and Molecular Physics and Optics Renormalization Massless particle High Energy Physics - Phenomenology Alpha (programming language) Theoretical physics High Energy Physics - Lattice High Energy Physics - Phenomenology (hep-ph) Quantum electrodynamics Path integral formulation Scaling |
| Popis: | We report on the non-perturbative computation of the running coupling of two-flavour QCD in the Schr"odinger functional scheme. The corresponding Lambda-parameter, which describes the coupling strength at high energy, is related to a low energy scale which still remains to be connected to a hadronic ``experimentally'' observable quantity. We find the non-perturbative evolution of the coupling indispensable to avoid untolerable errors in the estimated Lambda-parameter. Comment: 14 pages, 5 figures, 3 tables, some changes in the data analysis after discovery and correction of an error in Nucl. Phys. B 525, 387 (1998) by C. Christou et al. (hep-lat/9801007v2, Erratum to appear) |
| Databáze: | OpenAIRE |
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