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

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Presentation on theme: "A status report of the QCDSF N f =2+1 Project Yoshifumi Nakamura (NIC/DESY) for the QCDSF collaboration Lattice Regensburg Aug. 3, 2007."— Presentation transcript:

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

2 Introduction QCDSF Motivation: QCDSF Collaboration has performed simulations of lattice QCD with 2 flavors of dynamical quarks 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   ・ ・ ・ ・ ・ lattice 2007

3 Action QCDSF lattice 2007 Gauge: Improved gauge action Tadpole improved Symanzik glue: decrease O(a 2 ) lattice discretization error (N f =3) HPQCD

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

5 Algorithm QCDSF Partition function Even odd preconditioning lattice 2007

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

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

8 Algorithm test QCDSF lattice 2007

9 Test QCDSF lattice 2007

10 Partially quenched QCDSF lattice 2007

11 Partially quenched QCDSF lattice 2007

12 Vector meson QCDSF lattice 2007

13 Nucleon QCDSF lattice 2007

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

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

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

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