A Review of the Intrinsic Heavy Quark Content of the Nucleon

Figure 5

CTEQ6.6 + for different normalizations of the intrinsic bottom quark PDF at the scale  GeV, compared to the asymmetric PDF errors from the same set (a). Also shown is the ratio of the same PDF sets to the central value of CTEQ6.6 (b).

(a)

(b)