Speaker
doug toussaint
(University of Arizona)
Description
We use lattice gauge theory including the effects of light and strange
dynamical quarks to calculate the "strange quark content of the nucleon",
<N| s s_bar |N>, which is important for interpreting
the results of some dark matter detection experiments. The method
is to evaluate quark-line disconnected correlations on the MILC
lattice ensembles, which include the effects of dynamical strange
quarks. Calculations are done for three different lattice spacings
and a range of quark masses. After continuum and chiral extrapolations,
the result is <N |s s_bar |N> = 0.69 +- 0.07(statistical) +- 0.09(systematic),
in the ms_bar(2 GeV) regularization.
Author
doug toussaint
(University of Arizona)
Co-author
Walter Freeman
(University of Arizona)
