Initial nucleon structure results with chiral quarks at the physical point

Syritsyn, S.; Krieg, S.; Negele, J.; Jung, C.; Ohta, S.; Pochinsky, A.; Lin, M.; Green, J.; Meinel, S.; Blum, T.; Izubuchi, T.; Engelhardt, M.; Shintani, E.

Contribution to a conference proceedings/Internal Report

FZJ-2015-03322

Initial nucleon structure results with chiral quarks at the physical point

Syritsyn, S. (Corresponding Author) ; Blum, T. ; Engelhardt, M. ; Green, J. ; Izubuchi, T. ; Jung, C. ; Krieg, S.FZJ* ; Lin, M. ; Meinel, S. ; Negele, J. ; Ohta, S. ; Pochinsky, A. ; Shintani, E.

2015
SISSA Trieste

The 32nd International Symposium on Lattice Field Theory, Lattice 2014, Columbia University, New York, NY, USA, 23 Jun 2014 - 28 Jun 2014 Trieste : SISSA, Proceedings of Science LATTICE2014, 134 pp. (2015)

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Please use a persistent id in citations: http://hdl.handle.net/2128/10195

Report No.: KEK-TH-1784; MIT-CTP/4621; PoS(LATTICE2014)134; RBRC 1103

Abstract: We report initial nucleon structure results computed on lattices with 2+1 dynamical M\'obius domain wall fermions at the physical point generated by the RBC and UKQCD collaborations. At this stage, we evaluate only connected quark contributions. In particular, we discuss the nucleon vector and axial-vector form factors, nucleon axial charge and the isovector quark momentum fraction. From currently available statistics, we estimate the stochastic accuracy of the determination of $g_A$ and $<x>_{u-d}$ to be around 10%, and we expect to reduce that to 5% within the next year. To reduce the computational cost of our calculations, we extensively use acceleration techniques such as low-eigenmode deflation and all-mode-averaging (AMA). We present a method for choosing optimal AMA parameters.

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