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Phys. Rev. D 58, 014503 (1998) [14 pages]

Quenched hadron spectroscopy with improved staggered quark action

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Claude Bernard1, Tom Blum2, Thomas A. DeGrand3, Carleton DeTar4, Steven Gottlieb5, Urs M. Heller6, James E. Hetrick7, Craig McNeile4, K. Rummukainen8, Bob Sugar9, and Doug Toussaint10
1Department of Physics, Washington University, St. Louis, Missouri 63130
2Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
3Physics Department, University of Colorado, Boulder, Colorado 80309
4Physics Department, University of Utah, Salt Lake City, Utah 84112
5Department of Physics, Indiana University, Bloomington, Indiana 47405
6Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306-4130
7Physics Department, University of the Pacific, Stockton, California 95211-0197
8NORDITA, Blegdamsvej 17, DK-2100 Copenhagen /O, Denmark
9Department of Physics, University of California, Santa Barbara, California 93106
10Department of Physics, University of Arizona, Tucson, Arizona 85721

Received 9 December 1997; published 15 May 1998

We investigate light hadron spectroscopy with an improved quenched staggered quark action. We compare the results obtained with an improved gauge plus an improved quark action, an improved gauge plus standard quark action, and the standard gauge plus standard quark action. Most of the improvement in the spectroscopy results is due to the improved gauge sector. However, the improved quark action substantially reduces violations of Lorentz invariance, as evidenced by the meson dispersion relations.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.58.014503
DOI:
10.1103/PhysRevD.58.014503
PACS:
12.38.Gc, 14.20.-c, 14.40.-n
 
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