The strange and light quark contributions to the nucleon mass from Lattice QCD - INSPIRE

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The strange and light quark contributions to the nucleon mass from Lattice QCD

QCDSF

Collaboration

•

Gunnar S. Bali
(
- Regensburg U.
)

Nov, 2011

10 pages

Published in:

Phys.Rev.D 85 (2012) 054502

e-Print:

1111.1600 [hep-lat]

DOI:

10.1103/PhysRevD.85.054502

Report number:

ADELAIDE-ADP-11-33-T755,
EDINBURGH-2011-33,
LIVERPOOL-LTH-930,
DESY-11-245

View in:

ADS Abstract Service

reference search104 citations

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Abstract: (arXiv)

We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m_q in lattice QCD, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson Fermionic action. We simulate n_F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pion-nucleon sigma-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values \sigma_{\pi N} = 38(12) MeV at the physical point and f_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.

Note:

11 pages, 7 figures, v2: 1 reference added, some corrections

12.38.Gc
13.85.-t
14.20.Dh
nucleon: mass
quark: mass
quark: mass dependence
fermion: Wilson
strangeness
renormalization
pi nucleon: sigma term

References(46)

Figures(7)

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