Higgs production in $e$ and real $gamma$ collision

We investigate the Standard Model Higgs boson production in $e^-gamma$ collision. The electroweak one-loop contributions to the scattering amplitude for $e^-gammarightarrow e^-H$ are calculated and expressed in analytical form. We analyze the cross section for the Higgs production in $e^-gamma$ collision for each combination of polarizations of the initial electron and photon beams. The feasibility of observing the Higgs boson in $e^-+gammarightarrow e^-+b+{overline b}$ channel is examined.

Resummation of large logarithms in the heavy quark effects on the parton distributions inside the virtual photon

We discuss the resummation of the large logarithmic terms appearing in the heavy quark effects on parton distribution functions inside the virtual photon. We incorporate heavy quark mass effects by changing the initial condition of the leading-order DGLAP evolution equation. In a certain kinematical limit, we recover the logarithmic terms of the next-to-leading order heavy quark effects obtained in the previous work. This method enables us to resum the large logarithmic terms due to heavy quark mass effects on the parton distributions in the virtual photon. We numerically calculate parton distributions using the formulae derived in this work, and discuss the property of the resummed heavy quark effects.