  The decay of the Higgs boson into two photons is discussed. Using Sudakov
technicue, we study a new type of double logarithms in the case of the light
quark loop. First, we examine the origin of such logarithms at the one loop
level. Then we perform a two-loop analysis, and finally we present an explicit
result of the resummation of double logarithms in all order in QCD. The
phenomenological applications are discussed.
