Asymptotic scaling of the heavy-quark potential in lattice QCD
- Concurrent Computation Program, California Institute of Technology, Pasadena, CA (USA) Physics Department, California Institute of Technology, Pasadena, CA (USA)
The scaling behavior of the heavy-quark {ital q{bar q}} potential is studied by measuring Wilson-line operator-operator correlations via extensive simulations on large lattices. By using large size loops (up to 16{times}12) and extracting the potential at large distance {ital R}{ge}4, we find that the string tension satisfies the two-loop asymptotic scaling within about 95% accuracy at the coupling {beta}=6.0, 6.1, 6.2 and {alpha} remains a constant. Thus the scaling of the string tension sets in at around {beta}=6. The obtained values {radical}{sigma} /{Lambda}{sub {ital L}}=78{plus minus}4 and {alpha}{congruent}0.54{plus minus}0.11 agree well with the potential-model analysis on the {ital c{bar c}} and {ital b{bar b}} systems. Among the existing underlying string theories, our results favor the Neveu-Schwarz string theory.
- DOE Contract Number:
- FG03-85ER25009; AC03-81ER40050
- OSTI ID:
- 6227892
- Journal Information:
- Physical Review, D (Particles Fields); (USA), Vol. 42:7; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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645400* - High Energy Physics- Field Theory