Nucleon Structure on a Lattice at the Physical Point

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Syritsyn, Sergey^1

RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton

NY

11973, United States^1

关键词: Acceleration technique;    Axial vector;    Computational costs;    Eigen modes;    Form factors;    Momentum fraction;    Nucleon structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012054/pdf
DOI  :  10.1088/1742-6596/640/1/012054

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We report initial nucleon structure results computed on lattices with 2+1 dynamical Mobius 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 gAand xu-dto 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.