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Nucleon structure from 2+1f dynamical DWF lattice QCD at nearly physical pion mass

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 نشر من قبل Shigemi Ohta
 تاريخ النشر 2011
  مجال البحث
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 تأليف Shigemi Ohta IPNS




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Current status of nucleon structure calculations with joint RBC and UKQCD 2+1-flavor dynamical domain-wall fermions (DWF) lattice QCD is reported: Two ensembles with pion mass of about (m_pi=170) MeV and 250 MeV are used. The lattice cutoff is set at about 1.4 GeV, allowing a large spatial volume of about (L=4.6) fm across while maintaining a sufficiently small residual breaking of chiral symmetry with the dislocation-suppressing-determinant-ratio (DSDR) gauge action. We calculate all the isovector form factors and some low moments of isovector structure functions. We confirm the finite-size effect in isovector axialvector-current form factors, in particular the deficit in the axial charge and its scaling in terms of (m_pi L), that we reported from our earlier calculation at heavier pion masses.



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