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    Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pION mass

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    Genre
    Journal Article
    Date
    2017-06-01
    Author
    Alexandrou, C
    Constantinou, M
    Dimopoulos, P
    Frezzotti, R
    Hadjiyiannakou, K
    Jansen, K
    Kallidonis, C
    Kostrzewa, B
    Koutsou, G
    Mangin-Brinet, M
    Vaquero Avilès-Casco, A
    Wenger, U
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    Subject
    hep-lat
    hep-lat
    hep-ph
    nucl-ex
    nucl-th
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4886
    
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    DOI
    10.1103/PhysRevD.95.114514
    Abstract
    © 2017 American Physical Society. We present results on the light, strange and charm nucleon scalar and tensor charges from lattice QCD, using simulations with Nf=2 flavors of twisted mass clover-improved fermions with a physical value of the pION mass. Both connected and disconnected contributions are included, enabling us to extract the isoscalar, strange and charm charges for the first time directly at the physical point. Furthermore, the renormalization is computed nonperturbatively for both isovector and isoscalar quantities. We investigate excited state effects by analyzing several sink-source time separations and by employing a set of methods to probe ground state dominance. Our final results for the scalar charges are gSu=5.20(42)(15)(12), gSd=4.27(26)(15)(12), gSs=0.33(7)(1)(4), and gSc=0.062(13)(3)(5) and for the tensor charges gTu=0.794(16)(2)(13), gTd=-0.210(10)(2)(13), gTs=0.00032(24)(0), and gTc=0.00062(85)(0) in the MS scheme at 2 GeV. The first error is statistical, the second is the systematic error due to the renormalization and the third the systematic arising from estimating the contamination due to the excited states, when our data are precise enough to probe the first excited state.
    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/4868
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