Type

Journal Article

Authors

Michael Peardon
Sinead Ryan

Subjects

Education

Topics
software high performance computing science foundation ireland sfi capital grants scattering early career lattice qcd study of coupled channel science and technology

Coupled-channel D? , D?? and DsK?? scattering from lattice QCD (2016)

Abstract We present the rst lattice QCD study of coupled-channel D , D and D s K scattering in isospin-1/2 in three partial waves. Using distillation, we compute matrices of correlation functions with bases of operators capable of resolving both meson and meson- meson contributions to the spectrum. These correlation matrices are analysed using a variational approach to extract the nite-volume energy eigenstates. Utilising L uscher's method and its extensions, we constrain scattering amplitudes in S , P and D -wave as a function of energy. By analytically continuing the scattering amplitudes to complex energies, we investigate the S -matrix singularities. Working at m 391 MeV, we nd a pole corresponding to a J P = 0 + near-threshold bound state with a large coupling to D . We also nd a deeply bound J P = 1 We thank our colleagues within the Hadron Spectrum Collaboration. GM acknowledges support from the Herchel Smith Fund at the University of Cambridge and the Deutsche Forschungsgemeinschaft (DFG) under contract KN 947/1-2. SMR acknowledges support from Science Foundation Ireland [RFP-PHY-3201]. CET acknowledges support from the U.K. Science and Technology Facilities Council (STFC) [grant ST/L000385/1] and the Isaac Newton Trust/University of Cambridge Early Career Support Scheme [RG74916]. The software codes Chroma [ 58 ] and QUDA [ 59 , 60 ] were used to perform this work 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 funded through grants from Science Foundation Ireland (SFI). This work also used the DiRAC Data Analytic system at the University of Cambridge, operated by the University of Cambridge High Performance Computing Service on behalf of the STFC DiRAC HPC Facility ( www.dirac.ac.uk ). This equipment was funded by BIS National E-infrastructure capital grant ST/K001590/1, STFC capital grants ST/H008861/1 and ST/H00887X/1, and STFC DiRAC Operations grant ST/K00333X/1. DiRAC is part of the National E-Infrastructure. This research also used the Wilkes GPU cluster at the University of Cambridge High Performance Computing Service ( http://www.hpc.cam.ac.uk/ ),
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Full list of authors on original publication

Michael Peardon, Sinead Ryan

Experts in our system

1
Michael James Peardon
Trinity College Dublin
Total Publications: 64
 
2
Sinead Marie Ryan
Trinity College Dublin
Total Publications: 63