Journal
PHYSICAL REVIEW D
Volume 96, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.054513
Keywords
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Funding
- National Science Foundation (NSF) [PHY-1125915]
- Office of Science of the U.S. Department of Energy
- Lawrence Livermore National Laboratory on the Surface
- GPU GPU clusters
- Cab CPU
- Vulcan BG/Q clusters
- Office of Science of the U.S. Department of Energy, through a DOE Innovative and Novel Computational Impact on Theory and Experiment (INCITE) award (CalLat) [DE-AC05-00OR22725]
- Laboratory Directed Research and Development (LDRD) - LLNL [13-ERD-023]
- RIKEN Special Postdoctoral Researcher program
- DFG
- NSFC [CRC 110]
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- DOE Office Of Science, Offices of Nuclear Physics, High Energy Physics and Advanced Scientific Computing Research under the SciDAC program (USQCD)
- University of California [DE-AC02-05CH11231]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-FG02-04ER41302, DE-SC00046548, DE-SC0015376]
- Office of Advanced Scientific Computing Research, Scientific Discovery through Advanced Computing (SciDAC) program [KB0301052]
- DOE Early Career Research Program, Office of Nuclear Physics under FWP NQCDAWL
- Double-Beta Decay Topical Collaboration
- STFC [ST/P000746/1, ST/L000466/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/P000746/1, ST/L000466/1] Funding Source: researchfish
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We report on salient features of a mixed lattice QCD action using valence Mobius domain-wall fermions solved on the dynamical N-f = 2 + 1 + 1 highly improved staggered quark sea- quark ensembles generated by the MILC Collaboration. The approximate chiral symmetry properties of the valence fermions are shown to be significantly improved by utilizing the gradient- flow scheme to first smear the highly improved staggered quark configurations. The greater numerical cost of the Mobius domain- wall inversions is mitigated by the highly efficient QUDA library optimized for NVIDIA GPU accelerated compute nodes. We have created an interface to this optimized QUDA solver in CHROMA. We provide tuned parameters of the action and performance of QUDA using ensembles with the lattice spacings a similar or equal to {0.15; 0.12; 0.09} fm and pion masses m(pi) similar or equal to {310; 220; 130} MeV. We have additionally generated two new ensembles with a similar to 0.12 fm and m(pi) similar to {400; 350} MeV. With a fixed flow time of t(gf) = 1 in lattice units, the residual chiral symmetry breaking of the valence fermions is kept below 10% of the light quark mass on all ensembles, m(res) less than or similar to 0.1 x m(l), with moderate values of the fifth dimension L-5 and a domain- wall height M-5 <= 1.3. As a benchmark calculation, we perform a continuum, infinite volume, physical pion and kaon mass extrapolation of F-K +/-/F-pi +/- and demonstrate our results are independent of flow time and consistent with the FLAG determination of this quantity at the level of less than one standard deviation.
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