Bali, Gunnar S. and Collins, Sara and Goeckeler, Meinulf and Horsley, Roger and Nakamura, Yoshifumi and Nobile, Andrea and Pleiter, Dirk and Rakow, P. E. L. and Schaefer, Andreas and Schierholz, Gerrit and Sternbeck, Andre and Zanotti, James M. (2012) Strange and light quark contributions to the nucleon mass from lattice QCD. PHYSICAL REVIEW D, 85 (5): 054502. ISSN 1550-7998,
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SIGMA-TERM; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Dirk Pleiter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 19 May 2020 05:39 |
| Last Modified: | 19 May 2020 05:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19181 |
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