Nucleon structure from Lattice QCD using a nearly physical pion mass. Green, J. R., Engelhardt, M., Krieg, S., Negele, J. W., Pochinsky, A. V., & Syritsyn, S. N. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 734:290–295, 2014.
doi  abstract   bibtex   
We report the first Lattice QCD calculation using the almost physical pion mass m$\pi$ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment. \textcopyright 2014.
@article{Green2014,
abstract = {We report the first Lattice QCD calculation using the almost physical pion mass m$\pi$ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment. {\textcopyright} 2014.},
archivePrefix = {arXiv},
arxivId = {1209.1687},
author = {Green, J. R. and Engelhardt, M. and Krieg, S. and Negele, J. W. and Pochinsky, A. V. and Syritsyn, S. N.},
doi = {10.1016/j.physletb.2014.05.075},
eprint = {1209.1687},
issn = {03702693},
journal = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
keywords = {Form factors,Lattice QCD,Nucleon structure},
pages = {290--295},
title = {{Nucleon structure from Lattice QCD using a nearly physical pion mass}},
volume = {734},
year = {2014}
}

Downloads: 0