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

Walter Freeman, William D Toussaint

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The strangeness of the nucleon, hN| ss|Ni-h0| ss|0i , 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 hN| ss|Ni-h0| ss|0i = 0.69±0.07stat±0.09sys in the ms(2GeV) regularization.

Original languageEnglish (US)
JournalProceedings of Science
Volume91
StatePublished - Jan 1 2009
Event27th International Symposium on Lattice Field Theory, LAT 2009 - Beijing, China
Duration: Jul 26 2009Jul 31 2009

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quantum chromodynamics
quarks
strangeness
extrapolation
dark matter
spacing
continuums
configurations

ASJC Scopus subject areas

  • General

Cite this

The strange quark content of the nucleon in 2+1 flavor lattice QCD. / Freeman, Walter; Toussaint, William D.

In: Proceedings of Science, Vol. 91, 01.01.2009.

Research output: Contribution to journalConference article

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AB - The strangeness of the nucleon, hN| ss|Ni-h0| ss|0i , 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 hN| ss|Ni-h0| ss|0i = 0.69±0.07stat±0.09sys in the ms(2GeV) regularization.

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