TY - JOUR
T1 - Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point
AU - (PACS Collaboration)
AU - Shintani, Eigo
AU - Ishikawa, Ken Ichi
AU - Kuramashi, Yoshinobu
AU - Sasaki, Shoichi
AU - Yamazaki, Takeshi
N1 - Funding Information:
http://luscher.web.cern.ch/luscher/openQCD/ . is embedded. Numerical calculations for the present work have been carried out on Oakforest-PACS in Joint Center for advanced high performance computing, HOKUSAI GreatWave at Advanced Center for Computing and Communication (ACCC) of RIKEN, the K computer in RIKEN Center for Computational Science (CCS), and XC40 at YITP at Kyoto University. This research used computational resources of the HPCI system provided by the Information Technology Center of the University of Tokyo, RIKEN CCS through the HPCI System Research Project (Projects ID: hp140155, hp150135, hp160125, hp170022, hp180051, hp180072, hp180126). This work is supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (No. 16H06002) and a Grant-in-Aid for Scientific Research (C) (No. 18K03605), in part by the U.S.-Japan Science and Technology Cooperation Program in High Energy Physics for FY2018, Interdisciplinary Computational Science Program of Center for Computational Sciences in University of Tsukuba, and general use No. G18001 at ACCC of RIKEN.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - We present the nucleon form factors and root-mean-square (RMS) radii measured on a (10.8 fm)4 lattice at the physical point. We compute the form factors at small momentum transfer region in q2≤0.102 GeV2 with the standard plateau method choosing four source-sink separation times tsep from 0.84 to 1.35 fm to examine the possible excited state contamination. We obtain the electric and magnetic form factors and their RMS radii for not only the isovector channel but also the proton and neutron ones without the disconnected diagram. We also obtain the axial-vector coupling and the axial radius from the axial-vector form factor. We find that these three form factors do not show large tsep dependence in our lattice setup, and those RMS radii are consistent with the experimental values. On the other hand, the induced pseudoscalar and pseudoscalar form factors show the clear effects of the excited state contamination, which affect the generalized Goldberger-Treiman relation.
AB - We present the nucleon form factors and root-mean-square (RMS) radii measured on a (10.8 fm)4 lattice at the physical point. We compute the form factors at small momentum transfer region in q2≤0.102 GeV2 with the standard plateau method choosing four source-sink separation times tsep from 0.84 to 1.35 fm to examine the possible excited state contamination. We obtain the electric and magnetic form factors and their RMS radii for not only the isovector channel but also the proton and neutron ones without the disconnected diagram. We also obtain the axial-vector coupling and the axial radius from the axial-vector form factor. We find that these three form factors do not show large tsep dependence in our lattice setup, and those RMS radii are consistent with the experimental values. On the other hand, the induced pseudoscalar and pseudoscalar form factors show the clear effects of the excited state contamination, which affect the generalized Goldberger-Treiman relation.
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U2 - 10.1103/PhysRevD.99.014510
DO - 10.1103/PhysRevD.99.014510
M3 - Article
AN - SCOPUS:85061082424
VL - 99
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 1
M1 - 014510
ER -