Journal Article


Sinead Ryan
Michael Peardon



anisotropic lattices anisotropic two dimensional f and b mass spectroscopy hybrid monte carlo algorithm ireland lattice

First results from 2+1 dynamical quark flavors on an anisotropic lattice: Light-hadron spectroscopy and setting the strange-quark mass (2009)

Abstract We present the first light-hadron spectroscopy on a set of N f ? 2 ? 1 dynamical, anisotropic lattices. A convenient set of coordinates that parameterize the two-dimensional plane of light and strange-quark masses is introduced. These coordinates are used to extrapolate data obtained at the simulated values of the quark masses to the physical light and strange-quark point. A measurement of the Sommer scale on these ensembles is made, and the performance of the hybrid Monte Carlo algorithm used for generating the ensembles is estimated. This work was done using the CHROMA software suite [ 33 ] on clusters at Jefferson Laboratory using time awarded under the USQCD Initiative. We thank Andreas Stathopoulos and Kostas Orginos for implementing the EigCG inverter [ 27 ] in the CHROMA library, which greatly sped up our calculations. This research used the resources of the National Center for Computational Sciences at Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725. In particular, we made use of the Jaguar Cray XT facility, using time allo- cated through the U.S. DOE INCITE program. This re- search was supported in part by the National Science Foundation under Contract Nos. NSF-PHY-0653315 and NSF-PHY-0510020 through TeraGrid resources provided by Pittsburgh Supercomputing Center (PSC), San Diego Supercomputing Center (SDSC), and the Texas Advanced Computing Center (TACC). In particular, we made use of the BigBen Cray XT3 system at PSC, the BlueGene/L system at SDSC, and the Ranger Infiniband Constellation Cluster at TACC. J.B., J.F. and C.M. were supported by Grant Nos. NSF-PHY-0653315 and NSF-PHY-0510020; E.E. and S.W. were supported by DOE Grant No. DE- FG02-93ER-40762; N.M. was supported under Grant No. DST-SR/S2/RJN-19/2007. M.P. and S.R. were sup- ported by the Science Foundation Ireland under research Grant Nos. 04/BRG/P0275, 04/BRG/P0266, 06/RFP/ PHY061, and 07/RFP/PHYF168. M.P. and S.R. are ex- tremely grateful for the generous hospitality of the theory center at TJNAF while this research was carried out. This work was supported by DOE Contract No. DE-AC05- 06OR23177, under which Jefferson Science Associates, LLC, operates Jefferson Laboratory. The U.S. Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes
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Full list of authors on original publication

Sinead Ryan, Michael Peardon

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Sinead Marie Ryan
Trinity College Dublin
Total Publications: 63
Michael James Peardon
Trinity College Dublin
Total Publications: 64