Bali, G. S. and Collins, S. and Goeckeler, M. and Horsley, R. and Nakamura, Y. and Nobile, A. and Pleiter, D. and Rakow, P. E. L. and Sternbeck, A. and Schaefer, A. and Schierholz, G. and Zanotti, J. M. (2012) A lattice study of the strangeness content of the nucleon. PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, 67 (2). pp. 467-472. ISSN 0146-6410
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We determine the quark contributions to the nucleon spin Delta s, Delta u and Ad as well as their contributions to the nucleon mass, the a-terms. This is done by computing both, the quark line connected and disconnected contributions to the respective matrix elements, using the non-perturbatively 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 flavours. The pion-nucleon a-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized value sigma(pi N) = (38 +/- 12) MeV at the physical point and the strangeness fraction f(Ts) = sigma s/m(N) = 0.012(14)(-3)(+10) at our larger than physical sea quark mass. For the strangeness contribution to the nucleon spin we obtain Delta s ((MS)) over bar(root 7.4 GeV) = -0.020(10)(1). (C) 2012 Published by Elsevier B.V.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QCD; PROTON; Lattice QCD; Nucleon structure; Nucleon spin; sigma-term; Strangeness |
| 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: | Petra Gürster |
| Date Deposited: | 11 May 2020 10:36 |
| Last Modified: | 11 May 2020 10:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18948 |
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