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### The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions / Christopher Michael, R.D. Kenway, B.J. Pendleton, Christopher T. Sachrajda, D.G. Richards, K.C. Bowler, S.P. Booth, D.S. Henty, J.N. Simone, A.D. Simpson, P.W. Stephenson, Chris Allton

Physics Letters B, Volume: 292, Issue: 3-4, Pages: 408 - 412

Swansea University Author:

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DOI (Published version): 10.1016/0370-2693(92)91195-F

Abstract

We compute the hyperfine splitting $m_{J/\psi}-m_{\eta_c}$ on the lattice, using both the Wilson and $O(a)$-improved (clover) actions for quenched quarks. The computations are performed on a $24~3\times48$ lattice at $\beta = 6.2$, using the same set of 18 gluon configurations for both fermion actio...

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Published in: Physics Letters B 03702693 1992 https://cronfa.swan.ac.uk/Record/cronfa28430 No Tags, Be the first to tag this record!
first_indexed 2016-06-02T18:23:30Z 2018-02-09T05:12:32Z cronfa28430 SURis 2016-08-08T12:43:27.3594400v2284302016-06-02The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actionsde706a260fa1e1e47430693e135f41c70000-0003-0795-124XChrisAlltonChris Alltontruefalse2016-06-02SPHWe compute the hyperfine splitting $m_{J/\psi}-m_{\eta_c}$ on the lattice, using both the Wilson and $O(a)$-improved (clover) actions for quenched quarks. The computations are performed on a $24~3\times48$ lattice at $\beta = 6.2$, using the same set of 18 gluon configurations for both fermion actions. We find that the splitting is 1.83\err{13}{15} times larger with the clover action than with the Wilson action, demonstrating the sensitivity of the spin-splitting to the magnetic moment term which is present in the clover action. However, even with the clover action the result is less than half of the physical mass-splitting. We also compute the decay constants $f_{\eta_c}$ and $f~{-1}_{J/\psi}$, both of which are considerably larger when computed using the clover action than with the Wilson action. For example for the ratio $f~{-1}_{J/\psi}/f~{-1}_{\rho}$ we find 0.32\err{1}{2} with the Wilson action and $0.48\pm 3$ with the clover action (the physical value is 0.44(2)).Journal ArticlePhysics Letters B2923-440841203702693311219921992-12-3110.1016/0370-2693(92)91195-Fhttp://inspirehep.net/record/33097COLLEGE NANMEPhysicsCOLLEGE CODESPHSwansea University2016-08-08T12:43:27.35944002016-06-02T15:05:48.2607502College of SciencePhysicsChristopherMichael1R.D.Kenway2B.J.Pendleton3Christopher T.Sachrajda4D.G.Richards5K.C.Bowler6S.P.Booth7D.S.Henty8J.N.Simone0000-0001-8515-33379A.D.Simpson10P.W.Stephenson11ChrisAllton0000-0003-0795-124X12 2016-08-08T12:43:27.3594400 v2 28430 2016-06-02 The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions de706a260fa1e1e47430693e135f41c7 0000-0003-0795-124X Chris Allton Chris Allton true false 2016-06-02 SPH We compute the hyperfine splitting $m_{J/\psi}-m_{\eta_c}$ on the lattice, using both the Wilson and $O(a)$-improved (clover) actions for quenched quarks. The computations are performed on a $24~3\times48$ lattice at $\beta = 6.2$, using the same set of 18 gluon configurations for both fermion actions. We find that the splitting is 1.83\err{13}{15} times larger with the clover action than with the Wilson action, demonstrating the sensitivity of the spin-splitting to the magnetic moment term which is present in the clover action. However, even with the clover action the result is less than half of the physical mass-splitting. We also compute the decay constants $f_{\eta_c}$ and $f~{-1}_{J/\psi}$, both of which are considerably larger when computed using the clover action than with the Wilson action. For example for the ratio $f~{-1}_{J/\psi}/f~{-1}_{\rho}$ we find 0.32\err{1}{2} with the Wilson action and $0.48\pm 3$ with the clover action (the physical value is 0.44(2)). Journal Article Physics Letters B 292 3-4 408 412 03702693 31 12 1992 1992-12-31 10.1016/0370-2693(92)91195-F http://inspirehep.net/record/33097 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2016-08-08T12:43:27.3594400 2016-06-02T15:05:48.2607502 College of Science Physics Christopher Michael 1 R.D. Kenway 2 B.J. Pendleton 3 Christopher T. Sachrajda 4 D.G. Richards 5 K.C. Bowler 6 S.P. Booth 7 D.S. Henty 8 J.N. Simone 0000-0001-8515-3337 9 A.D. Simpson 10 P.W. Stephenson 11 Chris Allton 0000-0003-0795-124X 12 The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions Chris, Allton The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions The hyperfine splitting in charmonium. Lattice computations using the Wilson and clover fermion actions de706a260fa1e1e47430693e135f41c7 de706a260fa1e1e47430693e135f41c7_***_Chris, Allton Chris, Allton Christopher Michael R.D. Kenway B.J. Pendleton Christopher T. Sachrajda D.G. Richards K.C. Bowler S.P. Booth D.S. Henty J.N. Simone A.D. Simpson P.W. Stephenson Chris Allton Journal article Physics Letters B 292 3-4 408 1992 Swansea University 03702693 10.1016/0370-2693(92)91195-F College of Science collegeofscience College of Science collegeofscience College of Science Physics{{{_:::_}}}College of Science{{{_:::_}}}Physics http://inspirehep.net/record/33097 0 0 We compute the hyperfine splitting $m_{J/\psi}-m_{\eta_c}$ on the lattice, using both the Wilson and $O(a)$-improved (clover) actions for quenched quarks. The computations are performed on a $24~3\times48$ lattice at $\beta = 6.2$, using the same set of 18 gluon configurations for both fermion actions. We find that the splitting is 1.83\err{13}{15} times larger with the clover action than with the Wilson action, demonstrating the sensitivity of the spin-splitting to the magnetic moment term which is present in the clover action. However, even with the clover action the result is less than half of the physical mass-splitting. We also compute the decay constants $f_{\eta_c}$ and $f~{-1}_{J/\psi}$, both of which are considerably larger when computed using the clover action than with the Wilson action. For example for the ratio $f~{-1}_{J/\psi}/f~{-1}_{\rho}$ we find 0.32\err{1}{2} with the Wilson action and $0.48\pm 3$ with the clover action (the physical value is 0.44(2)). 1992-12-31T03:43:27Z 1711115188493615104 10.821735