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Nucleon structure from stochastic estimators

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arxiv 1311.1718 v2 pith:YSQXWOWD submitted 2013-11-07 hep-lat

Nucleon structure from stochastic estimators

classification hep-lat
keywords stochasticmethodnucleoncomputeestimatorsfreedomsequentialsource
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

Using stochastic estimators for connected meson and baryon three-point functions has successfully been tried in the past years. Compared to the standard sequential source method we trade the freedom to compute the current-to-sink propagator independently of the hadron sink for additional stochastic noise in our observables. In the case of the nucleon we can use this freedom to compute many different sink-momentum/polarization combinations, which grants access to more virtualities. We will present preliminary results on the scalar, electro-magnetic and axial form factors of the nucleon in $N_f=2+1$ lattice QCD and contrast the performance of the stochastic method to the sequential source method. We find the stochastic method to be competitive in terms of errors at fixed cost.

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