The strangeness contribution to the proton spin from Lattice QCD

Details The strangeness contribution to the proton spin from Lattice QCD The strangeness contribution to the proton spin from Lattice QCD

2011-12-14

arxiv.org/abs/1112.3354v1

Physics

High Energy Physics

High Energy Physics - Lattice

5 pages, 2 figures

Scientific paper

We compute the strangeness and light-quark contributions Delta s, Delta u and Delta d to the proton spin in nf=2 lattice QCD at a pion mass of about 285 MeV and at a lattice spacing a approx 0.073 fm, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson action. We carry out the renormalization of these matrix elements which involves mixing between contributions from different quark flavours. Our main result is the small negative value MSbar scheme value Delta s = -0.020(10)(4), at a scale mu = 7.4 GeV, of the strangeness contribution to the nucleon spin.

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