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 Zanotti, James M. (2012) Strangeness Contribution to the Proton Spin from Lattice QCD. PHYSICAL REVIEW LETTERS, 108 (22): 222001. ISSN 0031-9007,
Full text not available from this repository. (Request a copy)Abstract
We compute the strangeness and light-quark contributions Delta s, Delta u, and Delta d to the proton spin in n(f) = 2 lattice QCD at a pion mass of about 285 MeV and at a lattice spacing a approximate to 0.073 fm, using the nonperturbatively improved Sheikholeslami-Wohlert Wilson action. We carry out the renormalization of these matrix elements, which involves mixing between contributions from different quark flavors. Our main result is the small negative value Delta s((MS) over bar)(root 7.4 GeV) = -0.020(10)(4) of the strangeness contribution to the nucleon spin. The second error is an estimate of the uncertainty, due to the missing extrapolation to the physical point.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RENORMALIZATION; NUCLEON; LAMBDA; |
| 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: | 13 May 2020 09:19 |
| Last Modified: | 13 May 2020 09:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18711 |
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