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Simulations with Improved Staggered Fermions

Simulations with Improved Staggered Fermions. Carleton DeTar Brookhaven National Laboratory SciDAC All Hands Meeting March 26, 2004. MILC Collaboration. C. Aubin (Wash U) C. Bernard (Wash U) T. Burch (Regensberg) C. DeTar (U Utah) S. Gottlieb (Indiana U) E. Gregory (U Arizona)

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Simulations with Improved Staggered Fermions

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  1. Simulations with Improved Staggered Fermions Carleton DeTar Brookhaven National Laboratory SciDAC All Hands Meeting March 26, 2004

  2. MILC Collaboration • C. Aubin (Wash U) • C. Bernard (Wash U) • T. Burch (Regensberg) • C. DeTar (U Utah) • S. Gottlieb (Indiana U) • E. Gregory (U Arizona) • U. Heller (APS) • J. Hetrick (U Pacific) • J. Osborn (U Utah) • R. Sugar (UCSB) • D. Toussaint (U Arizona)

  3. Dataset coarse fine

  4. Tests of Simulation Parameters • Precision (double/single) • RMD step size • Finite volume • MD autocorrelation

  5. Precision

  6. MD Step Size

  7. Finite Volume

  8. Setting the Scale • Y(2S) – Y(1S) or Y(2P) – Y(1S) • Continuum, physical:

  9. Staggered Chiral Perturbation Theory • Taste splittings • and • Strange quark mass • Topological susceptibility • Nucleon mass

  10. Taste splitting

  11. Scaling of splittings • Chiral perturbation theory prediction: for • Observed: 0.35

  12. Preliminary HPQCD/MILC/UKQCD

  13. Strange quark mass HPQCD/MILC/UKQCD • Errors: statistical, simulation systematics, perturbation theory, e.m. effects • Improvement helps convergence in

  14. Topological Susceptibility • Staggered chiral perturbation theory

  15. Uncorrected

  16. Corrected

  17. Excited States and Decays • K • Overview

  18. Thermodynamics • vs. T • vs. T • Quark number susceptibility • Strangeness susceptibility

  19. Future • D, B decays (leptonic, semileptonic) • correlator (tests of ) • Quark plasma Equation of State • Hybrid exotics and decays

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