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000019010 0247_ $$2DOI$$a10.1103/PhysRevLett.108.222001
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000019010 084__ $$2WoS$$aPhysics, Multidisciplinary
000019010 1001_ $$0P:(DE-HGF)0$$aBali, G.S.$$b0
000019010 245__ $$aStrangeness Contribution to the Proton Spin from Lattice QCD
000019010 260__ $$aCollege Park, Md.$$bAPS$$c2012
000019010 300__ $$a222001
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000019010 440_0 $$04925$$aPhysical Review Letters$$v108$$x0031-9007$$y22
000019010 500__ $$aThis work is supported by the EU (Grant No. 238353, ITN STRONGnet) and by the DFG Grant No. SFB/TR55. S. C. acknowledges support from the Claussen-Simon-Foundation (Stifterverband fur die Deutsche Wissenschaft) and J. Z. from the Australian Research Council (Grant No. FT100100005). Computations were performed on the SFB/TR55 QPACE supercomputers, the BlueGene/P (JuGene) and the Nehalem Cluster (JuRoPA) of the Julich Supercomputer Center, 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 [33] was used and gauge configurations were generated with the BQCD code [34].
000019010 520__ $$aWe compute the strangeness and light-quark contributions Delta s, Delta u, and Delta d to the proton spin in n(f) = 2 lattice QCD at a pion mass of about 285 MeV and at a lattice spacing a approximate to 0.073 fm, using the nonperturbatively improved Sheikholeslami-Wohlert Wilson action. We carry out the renormalization of these matrix elements, which involves mixing between contributions from different quark flavors. Our main result is the small negative value Delta s((MS) over bar)(root 7.4 GeV) = -0.020(10)(4) of the strangeness contribution to the nucleon spin. The second error is an estimate of the uncertainty, due to the missing extrapolation to the physical point.
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000019010 7001_ $$0P:(DE-HGF)0$$aCollins, S.$$b1
000019010 7001_ $$0P:(DE-HGF)0$$aGöckeler, M.$$b2
000019010 7001_ $$0P:(DE-HGF)0$$aHorsley, R.$$b3
000019010 7001_ $$0P:(DE-HGF)0$$aNakamura, Y.$$b4
000019010 7001_ $$0P:(DE-Juel1)145828$$aNobile, A.$$b5$$uFZJ
000019010 7001_ $$0P:(DE-Juel1)144441$$aPleiter, D.$$b6$$uFZJ
000019010 7001_ $$0P:(DE-HGF)0$$aRakow, P.E.L.$$b7
000019010 7001_ $$0P:(DE-HGF)0$$aSchäfer, A.$$b8
000019010 7001_ $$0P:(DE-HGF)0$$aSchierholz, G.$$b9
000019010 7001_ $$0P:(DE-HGF)0$$aZanotti, J.M.$$b10
000019010 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.108.222001$$gVol. 108, p. 222001$$p222001$$q108<222001$$tPhysical review letters$$v108$$x0031-9007$$y2012
000019010 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevLett.108.222001
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