Publication Type |
Journal Article |
School or College |
College of Science |
Department |
Physics |
Creator |
DeTar, Carleton |
Other Author |
Bernard, Claude; DeGrand, Thomas; Hasenfratz, Anna; Osborn, James; Gottlieb, Steven; Gregory, Eric; Toussaint, Doug; Hart, Alistair; Heller, Urs M.; Hetrick, James; Sugar, Robert L. |
Title |
Topological susceptibility with the improved Asqtad action |
Date |
2003-12 |
Description |
Chiral perturbation theory predicts that in quantum chromodynamics light dynamical quarks suppress the topological (instanton) susceptibility.We investigate this suppression through direct numerical simulation using the Asqtad improved lattice fermion action. This action holds promise for carrying out nonperturbative simulations over a range of quark masses for which chiral perturbation theory is expected to converge. To test the effectiveness of the action in capturing instanton physics, we measure the topological susceptibility as a function of quark masses with 2+1 dynamical flavors. Our results, when extrapolated to zero lattice spacing, are consistent with predictions of leading order chiral perturbation theory. Included in our study is a comparison of three methods for analyzing the topological susceptibility: (1) the Boulder hypercubic blocking technique with the Boulder topological charge operator, (2) the more traditional Wilson cooling method with the twisted plaquette topological charge operator and (3) the improved cooling method of de Forcrand, Perez, and Stamatescu and their improved topological charge operator. We show in one comparison at nonzero lattice spacing that the largest difference between methods (1) and (2) can be attributed to the operator, rather than the smoothing method. |
Type |
Text |
Publisher |
American Physical Society |
Journal Title |
Physical Review D |
Volume |
68 |
Issue |
11 |
DOI |
10.1103/PhysRevD.68.114501 |
citatation_issn |
0556-2821 |
Subject |
Chiral perturbation; Staggered fermions |
Subject LCSH |
Quantum chromodynamics; Lattice gauge theories; Particles (Nuclear physics); Perturbation (Quantum dynamics); Quarks; Particles (Nuclear physics) -- Chirality |
Language |
eng |
Bibliographic Citation |
Bernard, C., DeGrand, T., Hasenfratz, A., DeTar, C., Osborn, J., Gottlieb, S., Gregory, E., Toussaint, D., Hart, A., Heller, U .M., Hetrick, J., & Sugar, R. L. (2003). Topological susceptibility with the improved Asqtad action. Physical Review D, 68(11), 114501. |
Rights Management |
(c) American Physical Society http://dx.doi.org/10.1103/PhysRevD.68.114501 |
Format Medium |
application/pdf |
Format Extent |
165,547 bytes |
Identifier |
ir-main,10276 |
ARK |
ark:/87278/s6jq1jpp |
Setname |
ir_uspace |
ID |
707088 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6jq1jpp |