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Two-flavor full QCD configurations by CP-PACS

The two-flavor full QCD configurations in this archive are generated by the CP-PACS Collaboration on the CP-PACS parallel computer at the Center for Computational Sciences, University of Tsukuba.

Access policy

When you download/use the files in this archive, please note the conditions given in the top page.

Simulation parameters

These gauge configurations are generated with a renormalization-group improved gauge action and a mean field improved clover quark action at three values of beta = 6/g2, corresponding to lattice spacings of a \approx 0.22, 0.16 and 0.11 fm, and four sea quark masses corresponding to mPS/mV \approx 0.8, 0.75, 0.7 and 0.6. The sizes of lattice are chosen to be 123x24, 163x32 and 243x48 so that the physical spatial size is kept constant at La \approx 2.5 fm. The scale a is fixed by Mrho = 768.4 MeV.

beta lattice cSW a [fm] La [fm] mPS/mV for sea quarks
#traj (thermalized)
1.80 123x24 1.60 0.2150(22) 2.580(26) 0.807(1)
6250 		0.753(1)
5000 		0.694(2)
7000 		0.547(4)
5250
1.95 163x32 1.53 0.1555(17) 2.489(27) 0.804(1)
7000 		0.752(1)
7000 		0.690(1)
7000 		0.582(3)
5000
2.10 243x48 1.47 0.1076(13) 2.583(31) 0.806(1)
4000 		0.755(2)
4000 		0.691(3)
4000 		0.576(3)
4000
2.20 243x48 1.44 0.0865(33) 2.076(79) 0.799(3)
2000 		0.753(4)
2000 		0.705(5)
2000 		0.632(7)
2000

Configurations are generated with the Hybrid Monte Carlo (HMC) algorithm. At the main coupling constants beta=1.8-2.1, runs are made with a length of 4000-7000 HMC unit-trajectories per sea quark mass. The additional runs at beta=2.2 are stopped at 2000 HMC trajectories per sea quark mass because the physical lattice size La turned out to be significantly smaller than the other three lattices. (Configurations at beta=2.2 are not stored in this Archive.) For the inversion of the quark matrix during the HMC update we use the even/odd preconditioned BiCGStab algorithm.

For the clover coefficient cSW we adopt a mean field improved choice defined by cSW = (W1x1)-3/4 = (1-0.8412/beta)-3/4 where for the plaquette W1x1 the value calculated in one-loop perturbation theory is substituted. This choice is based on our observation that the one-loop calculation of W1x1 reproduces the measured values well, with a difference of at most 8% in our simulations. We also note that the one-loop value of cSW = 1+0.678/beta differs from our choice cSW = 1+0.631/beta+... only by a few per cent. The leading scaling violation with our choice of the clover coefficient is O(g2a).

For more details, see

  • Light hadron spectroscopy with two flavors of dynamical quarks on the lattice
    CP-PACS Collaboration: A. AliKhan, S. Aoki, G. Boyd, R. Burkhalter, S. Ejiri, M. Fukugita, S. Hashimoto, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneko, Y. Kuramashi, T. Manke, K.-I. Nagai, M. Okawa, H.P. Shanahan, A. Ukawa, T. Yoshi\'e
    Phys. Rev. D 65 (2002) 054505 [E: D67 (2003) 059901] (hep-lat/0105015)
  • Comparative study of full QCD hadron spectrum and quark potential with improved actions
    CP-PACS Collaboration: S. Aoki, G. Boyd, R. Burkhalter, S. Hashimoto, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneko, Y. Kuramashi, M. Okawa, A. Ukawa, and T. Yoshi\'e
    Phys. Rev. D 60 (1999) 114508 (hep-lat/9902018)


Configuration ensembles

The table below gives a list of ensembles of configurations. A consecutive set of HMC trajectories for a given value of beta, kappa and cSW is called an ensemble. A series name (A, B, C, etc) is given to distinguish multiple HMC runs. The step size dt is sometimes changed in the course of HMC evolution as indicated in the table below.

ensemble # beta kappa cSW series lattice dt initial
traj 		final
traj 		#config size/config
[MB]		 total
[GB]
1 1.80 0.1409 1.60 A 123x24 0.0100
0.0330		 210
710		700
6750		 47
595		 22.815
2 1.80 0.1430 1.60 A 123x24 0.0080
0.0250		 210
700		680
5450		 47
472		 22.812
3 1.80 0.1445 1.60 A 123x24 0.0065
0.0200
0.0167		 210
510
580		500
570
3830		 30
7
322		 22.89
1.80 0.1445 1.60 B 123x24 0.0065 2103880 362 22.89
4 1.80 0.1464 1.60 A 123x24 0.0033 2601740 148 22.84
1.80 0.1464 1.60 B 123x24 0.0033 5901630 104 22.83
1.80 0.1464 1.60 C 123x24 0.0033 6001620 103 22.83
1.80 0.1464 1.60 D 123x24 0.0066 8901420 54 22.82
ensemble # beta kappa cSW series lattice dt initial
traj 		final
traj 		#config size/config
[MB]		 total
[GB]
5 1.95 0.1375 1.53 A 163x32 0.0313 1107100 599 72.044
6 1.95 0.1390 1.53 A 163x32 0.0200
0.0250		 110
150		140
7130		 4
682		 72.050
7 1.95 0.1400 1.53 A 163x32 0.0125
0.0156
0.0185		 10
70
420		60
410
3420		 6
35
294		 72.025
1.95 0.1400 1.53 B 163x32 0.0125
0.0156
0.0185		 10
70
480		60
470
3570		 6
40
305		 72.026
8 1.95 0.1410 1.53 A 163x32 0.0100
0.0080		 10
250		240
2500		 24
223		 72.018
1.95 0.1410 1.53 B 163x32 0.0100
0.0080		 10
240		230
2500		 22
226		 72.018
ensemble # beta kappa cSW series lattice dt initial
traj 		final
traj 		#config size/config
[MB]		 total
[GB]
9 2.10 0.1357 1.47 A 243x48 0.0200 2054205 798 364.5291
10 2.10 0.1367 1.47 A 243x48 0.0160 2154235 788 364.5288
11 2.10 0.1374 1.47 A 243x48 0.0143 2054200 767 364.5280
12 2.10 0.1382 1.47 A 243x48 0.0075 2051505 253 364.593
2.10 0.1382 1.47 B 243x48 0.0075 2051835 320 364.5117
2.10 0.1382 1.47 C 243x48 0.0075 2051265 213 364.578

Naming of Ensembles and Configurations

An ensemble is identified by markovChainURI named e.g. as A configuration labeled by dataLFN named e.g. as can be downloaded using http or gsiftp The corresponding configuration-xml file can be accessed using http or gsiftp Basename of the dataLFN is formmated as
RgClover spatial size x temporal size - \beta\kappa\c_sw - series - trajectory number

Publications on two-flavor QCD by the CP-PACS Collaboration

For a full list of publications by the CP-PACS Collaboration, visit here [SPIRES database].

Journal papers

Conference reports and reviews


LQA
Lattice QCD Archive @ Center for Computational Sciences, Univ.Tsukuba
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Last update: 25 July 2007, T.Yoshie