Journal Article


Michael Peardon
Sinead Ryan



high performance computing irish government lattice qcd science and technology highly excited charmonium science foundation ireland sfi s college trinity college dublin

Excited and exotic charmonium, Ds and D meson spectra for two light quark masses from lattice QCD (2016)

Abstract We present highly-excited charmonium, D s and D meson spectra from dy- namical lattice QCD calculations with light quarks corresponding to M 240 MeV and compare these to previous results with M 400 MeV. Utilising the distillation framework, large bases of carefully constructed interpolating operators and a variational procedure, we extract and reliably identify the continuum spin of an extensive set of excited mesons. These include states with exotic quantum numbers which, along with a number with non- exotic quantum numbers, we identify as having excited gluonic degrees of freedom and interpret as hybrid mesons. Comparing the spectra at the two di erent M , we nd only a mild light-quark mass dependence and no change in the overall pattern of states. We thank our colleagues in the Hadron Spectrum Collaboration. GC is supported by the Cambridge European Trust, the U.K. Science and Technology Facilities Council (STFC) and St. John's College, Cambridge. COH acknowledges support from the School of Math- ematics at Trinity College Dublin. GM acknowledges support the Herchel Smith Fund at the University of Cambridge. SMR acknowledges support from Science Foundation Ireland [RFP-PHY-3201]. CET acknowledges support from the STFC [grant ST/L000385/1]. DT is supported by the Irish Research Council Government of Ireland Postgraduate Scholarship Scheme [grant GOIPG/2014/65]. This work used the DiRAC Complexity system, operated by the University of Leices- ter IT Services, which forms part of the STFC DiRAC HPC Facility (www.dirac.ac.uk). This equipment is funded by BIS National E-Infrastructure capital grant ST/K000373/1 and STFC DiRAC Operations grant ST/K0003259/1. DiRAC is part of the National E-Infrastructure. This work also used the Wilkes GPU cluster at the University of Cam- bridge High Performance Computing Service (http://www.hpc.cam.ac.uk/), provided by Dell Inc., NVIDIA and Mellanox, and part funded by STFC with industrial sponsorship from Rolls Royce and Mitsubishi Heavy Industries. Computations were also performed at Je erson Laboratory under the USQCD Initiative and the LQCD ARRA project and on the Lonsdale cluster maintained by the Trinity Centre for High Performance Computing (TCHPC) funded through grants from Science Foundation Ireland (SFI). The software codes Chroma [65], QUDA [66, 67 ], QPhiX [68], and QOPQDP [69, 70 ] were used to compute the propagators required for this project. This research was supported in part under an ALCC award, and used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the O ce of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. This research is also part of the Blue Waters sustained-petascale computing project, which is supported by the National Science Foundation (awards OCI-0725070 and ACI-1238993) and the state of Illinois. Blue Waters is a joint e ort of the University of Illinois at Urbana-Champaign and its National Center for Supercomputing Applications. This work is also part of the PRAC \Lattice QCD on Blue Waters". This research used resources of the National Energy Research Scienti c Computing Center (NERSC), a DOE O ce of Science User Facility supported by the O ce of Science of the U.S. Department of Energy under Contract No. DEAC02-05CH11231. The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin for providing HPC resources that have contributed to the research results reported within this paper. Gauge con gurations were generated using resources awarded from the U.S. Depart- ment of Energy INCITE program at the Oak Ridge Leadership Computing Facility, the...
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Full list of authors on original publication

Michael Peardon, Sinead Ryan

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