  Heavy quark parton distribution functions (PDFs) play an important role in
several Standard Model and New Physics processes. Most PDF analyses rely on the
assumption that the charm and bottom PDFs are generated perturbatively by gluon
splitting and do not include any non-perturbative degrees of freedom. However,
a non-perturbative, intrinsic heavy quark PDFs have been predicted in the
literature. We demonstrate that to a very good approximation the
scale-evolution of the intrinsic heavy quark content of the nucleon is governed
by non-singlet evolution equations, and use this approximation to model the
intrinsic bottom distribution and its impact on parton-parton luminosities at
the LHC.
