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    Up, down, and strange nucleon axial form factors from lattice QCD

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    PhysRevD.95.114502.pdf
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    Author
    Green, Jeremy
    Hasan, Nesreen
    Meinel, Stefan
    Engelhardt, Michael
    Krieg, Stefan
    Laeuchli, Jesse
    Negele, John
    Orginos, Kostas
    Pochinsky, Andrew
    Syritsyn, Sergey
    Affiliation
    Univ Arizona, Dept Phys
    Issue Date
    2017-06-14
    
    Metadata
    Show full item record
    Publisher
    AMER PHYSICAL SOC
    Citation
    Up, down, and strange nucleon axial form factors from lattice QCD 2017, 95 (11) Physical Review D
    Journal
    Physical Review D
    Rights
    © 2017 American Physical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report a calculation of the nucleon axial form factors G(A)(q)(Q(2)) and G(A)(q)(Q(2)) for all three light quark flavors q is an element of{u, d, s} in the range 0 <= Q(2) less than or similar to 1.2 GeV2 using lattice QCD. This work was done using a single ensemble with pion mass 317 MeVand 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 G(A)(q)(Q(2)), we determine the quark contributions to the nucleon spin and axial radii. By extrapolating the isovector G(P)(u-d)(Q(2)), we obtain the induced pseudoscalar coupling relevant for ordinary muon capture and the pion-nucleon coupling constant. We find that the disconnected contributions to G(P) form factors are large, and give an interpretation based on the dominant influence of the pseudoscalar poles in these form factors.
    ISSN
    2470-0010
    2470-0029
    DOI
    10.1103/PhysRevD.95.114502
    Version
    Final published version
    Sponsors
    Office of Science of the U.S. Department of Energy; National Science Foundation [ACI-1053575, CCF-121834, PHY-1520996]; Forschungszentrum Julich; U.S. Department of Energy Office of Nuclear Physics [DE-FG02-94ER40818, DE-SC-0011090, DE-FG02-96ER40965, DE-FC02-12ER41890, DE-FG02-04ER41302, DE-AC02-05HC11231, DE-AC05-06OR23177]; RIKEN Foreign Postdoctoral Researcher program; RIKENBNL Research Center; Deutsche Forschungsgemeinschaft [SFB-TRR 55]; PRISMA Cluster of Excellence at the University of Mainz
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevD.95.114502
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevD.95.114502
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