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Description
We present a lattice QCD calculation of the strange quark contribution to the proton’s magnetic moment and the charge radius at the physical pion mass. We perform a model independent extraction of the strange magnetic moment and strange charge radius from the electromagnetic form factors in the momentum transfer range of 0.051 GeV2 <∼ Q 2 <∼ 1.31 GeV2. The finite lattice spacing and finite volume corrections are included in a global fitting on three lattices with different lattice spacings, different volumes, and three sea quark masses. We obtain the strange magnetic moment GsM(0) = −0.073(17) µN and strange charge radius < r2s >E= −0.0047(22) fm2. Additionally, we present our results of the disconnected u, d quarks contribution to the proton’s electromagnetic form factors.
