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    Gluon momentum fraction of the nucleon from lattice QCD

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    Genre
    Journal Article
    Date
    2017-09-01
    Author
    Alexandrou, C
    Constantinou, M
    Hadjiyiannakou, K
    Jansen, K
    Panagopoulos, H
    Wiese, C
    Subject
    hep-lat
    hep-lat
    hep-ex
    hep-ph
    hep-th
    nucl-th
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5682
    
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    DOI
    10.1103/PhysRevD.96.054503
    Abstract
    © 2017 American Physical Society. We perform a direct calculation of the gluon momentum fraction of the nucleon, taking into account the mixing with the corresponding quark contribution. We use maximally twisted mass fermion ensembles with Nf=2+1+1 flavors at a pion mass of about 370 MeV and a lattice spacing of a≈0.082 fm and with Nf=2 flavors at the physical pion mass and a lattice spacing of a≈0.093 fm. We employ stout smearing to obtain a statistically significant result for the bare matrix elements. In addition, we perform a lattice perturbative calculation including two levels of stout smearing to carry out the mixing and the renormalization of the quark and gluon operators. We find, after conversion to the MS- scheme at a scale of 2 GeV xgR=0.284(27)(17)(24) for pion mass of about 370 MeV and xgR=0.267(22)(19)(24) for the physical pion mass. In the reported numbers, the first parenthesis indicates statistical uncertainties. The numbers in the second and third parentheses correspond to systematic uncertainties due to excited states contamination and renormalization, respectively.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review D
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5664
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