@article{da18c47660c44be9871ded4b03b242fe,
title = "Up, down, and strange nucleon axial form factors from lattice QCD",
abstract = "We report a calculation of the nucleon axial form factors GAq(Q2) and GPq(Q2) for all three light quark flavors q-{u,d,s} in the range 0≤Q21.2 GeV2 using lattice QCD. This work was done using a single ensemble with pION mass 317 MeV and made use of the hierarchical probing technique to efficiently evaluate the required disconnected loops. We perform nonperturbative renormalization of the axial current, including a nonperturbative treatment of the mixing between light and strange currents due to the singlet-nonsinglet difference caused by the axial anomaly. The form factor shapes are fit using the model-independent z expansion. From GAq(Q2), we determine the quark contributions to the nucleon spin and axial radii. By extrapolating the isovector GPu-d(Q2), we obtain the induced pseudoscalar coupling relevant for ordinary muon capture and the pion-nucleon coupling constant. We find that the disconnected contributions to GP form factors are large, and give an interpretation based on the dominant influence of the pseudoscalar poles in these form factors.",
author = "Jeremy Green and Nesreen Hasan and Stefan Meinel and Michael Engelhardt and Stefan Krieg and Jesse Laeuchli and John Negele and Kostas Orginos and Andrew Pochinsky and Sergey Syritsyn",
note = "Funding Information: Computations for this work were carried out on facilities of the USQCD Collaboration, which are funded by the Office of Science of the U.S. Department of Energy, on facilities provided by XSEDE, funded by National Science Foundation Grant No. ACI-1053575, and at Forschungszentrum JUlich. During this research several of us were supported in part by the U.S. Department of Energy Office of Nuclear Physics under Grants No. DE-FG02-94ER40818 (J.G., S.M., J.N., and A.P.), No. DE-SC-0011090 (J.N.), No. DE-FG02-96ER40965 (M.E.), No. DE-FC02-12ER41890 (J.L.), No. DE-FG02-04ER41302 (K.O.), No. DE-AC02-05HC11231 (S.S.), and No. DE-AC05-06OR23177 under which JSA operates the Thomas Jefferson National Accelerator Facility (K.O.). Support was also received from National Science Foundation Grants No. CCF-121834 (J.L.) and No. PHY-1520996 (S.M.), the RIKEN Foreign Postdoctoral Researcher program (S.S.), the RHIC Physics Fellow Program of the RIKEN BNL Research Center (S.M.), Deutsche Forschungsgemeinschaft Grant No. SFB-TRR 55 (S.K.), and the PRISMA Cluster of Excellence at the University of Mainz (J.G.). Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = jun,
day = "1",
doi = "10.1103/PhysRevD.95.114502",
language = "English (US)",
volume = "95",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "11",
}