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Advancements in Lattice QCD Simulations: QCDSF Nf=2+1 Project Report

This report by Yoshifumi Nakamura for the QCDSF Collaboration provides insights on lattice QCD simulations with 2+1 flavors of dynamical quarks. Motivated by real-world scenarios with 6 flavors, the project aims to improve hadron and quark masses, weak matrix elements, and moments of generalized distributions. The action involves improved gauge and fermion actions, UV filtering for better chiral properties, and advanced algorithms like even-odd preconditioning and multi-mass preconditioning. The project's performance on Altix and BGL systems is at around 20-25% of peak, showcasing promising developments for future tests and idea implementations.

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Advancements in Lattice QCD Simulations: QCDSF Nf=2+1 Project Report

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  1. A status report of the QCDSF Nf=2+1 Project Yoshifumi Nakamura (NIC/DESY) for the QCDSF collaboration Lattice 2007 @ Regensburg Aug. 3, 2007

  2. QCDSF lattice 2007 Introduction QCDSF Collaboration has performed simulations of lattice QCD with 2 flavors of dynamical quarks Motivation: Real world: 6 flavors (3 light, 3 heavy) We want to deal with u, d and s quark dynamically Expectation: • Improve: • the hadron and quark masses • weak matrix element • Moments of generalized distributions • ・ ・ ・ ・ ・

  3. QCDSF lattice 2007 Action Gauge: Improved gauge action Tadpole improved Symanzik glue: decrease O(a2) lattice discretization error (Nf=3) HPQCD

  4. QCDSF lattice 2007 Action Fermion: Clover fermion action with stout links(FLRC) Morningstar & Peardon Mild form of UV filtering: better chiral properties smaller cut-off effects

  5. QCDSF lattice 2007 Algorithm Partition function Even odd preconditioning

  6. QCDSF lattice 2007 Algorithm Multi mass preconditioning Hasenbusch We modify action • Horváth, Kennedy & Sint

  7. QCDSF lattice 2007 Algorithm Multiple time integration scheme: Sexton & Weingarten 3 time scales Chronological inverter by Minimal Residual Extrapolation: Brower et al., NPB484

  8. QCDSF lattice 2007 Algorithm test

  9. QCDSF lattice 2007 Test

  10. QCDSF lattice 2007 Partially quenched

  11. QCDSF lattice 2007 Partially quenched

  12. QCDSF lattice 2007 Vector meson

  13. QCDSF lattice 2007 Nucleon

  14. QCDSF lattice 2007 Our 2+1 flavors action is more continuum like than our 2 flavors

  15. QCDSF lattice 2007 Conclusion QCDSF 2+1 project started We did good choice for action Plan: TODO: More elaborate tests Implementing new idea Performance: ~20% of peak @Altix 20-25% of peak @BGL

  16. QCDSF lattice 2007 RHMC • Horváth, Kennedy & Sint optimal coefficients are found by the Remez algorithm for a given range MC step MD step

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