Transverse-momentum resummation for the signal- background interference in the H → γγ channel at the LHC

We present an upgraded calculation of the effects of resonance-continuum interference for the Higgs boson decaying to two photons at the Large Hadron Collider, at next-to-leading order in the strong coupling alpha(S), O(alpha(3)(S)), and including transverse-momentum (q(T)) resummation at next-to-leading logarithmic accuracy. We study the importance of the interference contribution in different transverse-momentum regions, with a particular focus on the low-q(T) region q(T)(2) << Q(2) (with Q(2) being the invariant diphoton mass) where resummation becomes essential for a reliable calculation.