This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevD.85.054502 in citations.
Please use the identifier: http://hdl.handle.net/2128/11137 in citations.
Strange and light quark contributions to the nucleon mass from lattice QCD
Strange and light quark contributions to the nucleon mass from lattice QCD
We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m(q)< N vertical bar(q) over barq vertical bar N > in lattice QCD, using the nonperturbatively improved Sheikholeslami-Wohlert...
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Personal Name(s): | Bali, G.S. |
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Collins, S. / Göckeler, M. / Horsley, R. / Nakamura, Y. / Nobile, A. / Pleiter, D. / Rakow, P.E.L. / Schäfer, A. / Schierholz, G. / Sternbeck, A. / Zanotti, J.M. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC |
Published in: | Physical Review D Physical review / D, 85 85 (2012 2012) 5 5, S. 054502 054502 |
Imprint: |
[S.l.]
Soc.
2012
2012-03-01 2012-03-01 |
Physical Description: |
054502 |
DOI: |
10.1103/PhysRevD.85.054502 |
Document Type: |
Journal Article |
Research Program: |
Precision lattice QCD calculations Strong Interaction Supercomputing Training Network Computational Science and Mathematical Methods Scientific Computing |
Series Title: |
Physical Review D
85 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/11137 in citations.
We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m(q)< N vertical bar(q) over barq vertical bar N > in lattice QCD, using the nonperturbatively improved Sheikholeslami-Wohlert Wilson fermionic action. We simulate n(F) = 2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approximate to 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavors. The pion-nucleon sigma term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values sigma(pi N) = (38 +/- 12) MeV at the physical point and f(Ts) = sigma(s)/m(N) = 0.012(14)(-3)(+10) for the strangeness contribution at our larger than physical sea quark mass. |