SciDAC LQCD: Hadron Structure at Light Quark Masses

Status

This page summarizes lattice resources generated in the LHPC project Hadron Structure at Light Quark Masses

Domain Wall Fermions (DWF)

DWF Propagators

These lattices contain 4 sets of forward propagators and 4 sets of Nucleon sequential propagators and their associated building blocks and 4 sets of Antinucleon sequential propagators and their associated building blocks.

ml	ms	Volume	nt	a	Configurations Available	Forward Propagators (4 sets)	Nucleon Propagators	Antinucleon Propagators	Nucleon Building Blocks	Antinucleon Building Blocks	AFF
0.005	0.04	24^3	64	0.12fm	401	401	401	401	401	401	-
0.004	0.03	32^3	64	0.09fm	548	548	548	548	548	548	429
0.006	0.03	32^3	64	0.09fm	813	526	526	526	526	526	526
0.008	0.03	32^3	64	0.09fm	520	461	461	461	461	461	307

DWF Nonperturbative Renormalization

NPR vertices computed for all thre values of m_l.

ml	ms	Volume	nt	a	Configurations Used	Momenta	Propagators	Vertices
0.004	0.03	32^3	64	0.09fm	54	32	1728	1728
0.006	0.03	32^3	64	0.09fm	55	32	1760	1760
0.008	0.03	32^3	64	0.09fm	54	32	1728	1728

DWF Propagators at ΔT=14

To test the sink-source separation dependence, ΔT=14 is ran on the lightest lattice. These lattices share forward propagators with ΔT=12 configurations

ml	ms	Volume	nt	a	Configurations Available	Forward Propagators (4 sets)	Nucleon Propagators	Antinucleon Propagators	Nucleon Building Blocks	Antinucleon Building Blocks	AFF
0.004	0.03	32^3	64	0.09fm	548	548	331	331	331	331	331

Sensitivity to Coherent Sinks at ΔT=14

To test the coherent backward propagators, separation 14 is tested on the lightest lattice. These lattices share forward propagators with ΔT=12 configurations

ml	ms	Volume	nt	a	Configurations Available	Forward Propagators (4 sets)	Nucleon Propagators	Antinucleon Propagators	Nucleon Building Blocks	Antinucleon Building Blocks	AFF
0.004	0.03	32^3	64	0.09fm	548	548	80	80	80	80	-

Hybrid Action: Domain Wall Valence Quarks on a HYP-Smeared Asqtad Sea (MILC)

Light Masses on T=64 Lattices

ml	ms	Volume	nt	Configurations Available	Forward Propagators (4 sets)	Nucleon Propagators	Antinucleon Propagators	Nucleon Building Blocks	Antinucleon Building Blocks	AFF
0.010	0.050	20^3	64	658	658	658	658	658	658	658
0.010	0.050	28^3	64	274	274	274	274	274	274	274
0.007	0.050	20^3	64	468	468	468	468	468	468	468

All Masses on T=32 Lattices

ml	ms	Volume	nt	Configurations Available	Forward Propagators	Nucleon Propagators	Nucleon Building Blocks	AFF
0.050	0.050	20^3	64	425	425	425	425	425
0.040	0.050	20^3	64	350	350	350	350	350
0.030	0.050	20^3	64	564	564	564	564	564
0.020	0.050	20^3	64	486	486	486	486	486
0.010	0.050	20^3	64	658	658	658	658	658
0.010	0.050	28^3	64	275	275	275	275	275
0.007	0.050	20^3	64	468	468	468	468	468

Domain wall propagators for use in calculating matrix elements of one-body operators in the nucleon were generated on MILC lattices using US Lattice QCD resources, as described in the following reference.

Publicly available MILC lattices at a=0.125fm of size 20^3 x 64 and 28^3 x 64 were HYP smeared. These lattices were used in their entirety for the T=64 lattice propagators and were separated into two sublattices, t=0..31 and t=32..63, with Dirichlet boundary conditions for the T=32 lattice propagators. On the sublattices, Wuppertal smeared sources were used to calculate forward propagators, which were in turn used to construct smeared nucleon sinks for backward propagators at two momenta, with components (p_x, p_y, p_z) = (0,0,0) and (-1,0,0) respectively. The size of the 5th dimension was L_5 = 16 in all cases. Directories to the propagators stored at Jefferson lab are given on the datasets page.

The MILC trajectories are stored every 6 steps. To minimize autocorrelations, the propagator calculation described above was carried out on only one of the sublattices for each gauge configuration, alternating between the t=0..31 and the t=32..63 sublattices.

Last updated: Jan 25, 2008