Toussaint D, Freeman W
Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.
Phys Rev Lett. 2009 Sep 18;103(12):122002. doi: 10.1103/PhysRevLett.103.122002.
We calculate the "strange quark content of the nucleon," <N|s[over]s|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 light and strange quarks. After continuum and chiral extrapolations, the result is <N|s[over]s|N> = 0.69(7){stat}(9){syst}, in the modified minimal subtraction scheme (2 GeV) regularization, or for the renormalization scheme invariant form, m_{s} partial differentialM_{N}/ partial differentialm_{s} = 59(6)(8) MeV.
我们计算了“核子的奇异夸克含量”，即<N|s̅s|N>，这对于解释一些暗物质探测实验的结果很重要。方法是在MILC格点系综上评估夸克线非连通关联，其中包括动态轻夸克和奇异夸克的效应。经过连续统和手征外推后，结果为<N|s̅s|N> = 0.69(7)stat(9)syst，采用修正的最小减法方案（2 GeV）正则化，或者对于重整化方案不变形式，ms∂MN/∂ms = 59(6)(8) MeV。
