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The strange quark content of the nucleon in 2+1 flavor lattice QCD · Around

2009

The strange quark content of the nucleon in 2+1 flavor lattice QCD

Freeman, Walter, Toussaint, Doug

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The strangeness of the nucleon, <N|ss|N> - <0|ss|0>, is a quantity of interest for interpreting the results of dark matter detection experiments as well as for exploring the structure of the nucleon itself.

We present a calculation of this quantity in 2+1 flavor lattice QCD using a range of lattice spacings and quark masses.
The method is based on calculating quark-line disconnected contributions on the MILC lattice configurations, which include the effects of dynamical strange quarks.
After continuum and chiral extrapolations, the value is <N|ss|N> - <0|ss|0> = 0.69 +/- 0.07(stat) +/- 0.09(sys) in the msbar(2GeV) regularization.

Built on

M. Fukugita, Y. Kuramashi, M. Okawa, A. Ukawa, Pion-Nucleon Sigma Term in Lattice QCD , Phys. Rev. D 51
1995
Earlier work this paper cites.
π N σ \pi N\sigma Term , s ¯ s \bar{s}s in Nucleon, and Scalar Form Factor — a Lattice Study , S.J. Dong, J.-F. Lagaë, K.F. Liu, Phys. Rev. D 54
1996
Earlier work this paper cites.
The Pion-Nucleon sigma-Term with Dynamical Wilson Fermions , SESAM-Collaboration: S. Güsken et al
1999
Earlier work this paper cites.
UKQCD: C. Michael et al
2002
Earlier work this paper cites.

Similar

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MILC: A. Bazavov et al
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Cited in the paper.

Then

H. Ohki et al
Original
2008
Later among the works it cites.
G. Bali, S. Collins and A. Schafer, in proceedings of LATTICE 2008, \pos
Original
2008
Later among the works it cites.
D. Toussaint and W. Freeman, Strange Quark Condensate in the Nucleon in 2+1 Flavor QCD , Phys. Rev. Lett. 103
2009
Closest in time.

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