Home > Publications database > A lattice study of the strangeness content of the nucleon > print

001     21703
005     20210129210806.0
024 7 _ |2 DOI
|a 10.1016/j.ppnp.2012.01.012
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037 _ _ |a PreJuSER-21703
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Physics, Nuclear
084 _ _ |2 WoS
|a Physics, Particles & Fields
100 1 _ |0 P:(DE-HGF)0
|a Bali, G.S.
|b 0
245 _ _ |a A lattice study of the strangeness content of the nucleon
260 _ _ |a Oxford [u.a.]
|b Pergamon Press
|c 2012
300 _ _ |a 467 - 472
336 7 _ |a Journal Article
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440 _ 0 |0 5138
|a Progress in Particle and Nuclear Physics
|v 67
|x 0146-6410
|y 2
500 _ _ |a This work was supported by the European Union (grant 238353, ITN STRONGnet) and by the DFG SFB/Transregio 55. S.C. is supported by the Claussen-Simon-Foundation (Stifterverband fur die Deutsche Wissenschaft), A.St. by the EU IRG grant 256594 and J.Z. by the Australian Research Council grant FT100100005. Computations were performed on the SFB/TR55 QPACE supercomputers, the BlueGene/P (JuGene) and the Nehalem cluster (JuRoPA) of the JSC (Julich), the IBM BlueGene/L at the EPCC (Edinburgh), the SGI Altix ICE machines at HLRN (Berlin/Hannover) and Regensburg's Athene HPC cluster. The Chroma software suite [24] was used extensively in this work.
520 _ _ |a 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.
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653 2 0 |2 Author
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653 2 0 |2 Author
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653 2 0 |2 Author
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653 2 0 |2 Author
|a Strangeness
700 1 _ |0 P:(DE-HGF)0
|a Collins, S.
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|a Göckeler, M.
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856 7 _ |u http://dx.doi.org/10.1016/j.ppnp.2012.01.012
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