Bounds on supersymmetric effective operators from heavy diphoton searches

Abstract

We identify the bounds on supersymmetric effective operators beyond minimal supersymmetric models (MSSM, etc.), from heavy diphoton resonance (X) negative searches at the LHC, where X is identified with the neutral CP-even (odd), H(A) or both (mass degenerate). While MSSM-like models comply with the data, a leading effective operator of d = 6 can contribute significantly to diphoton production [Formula: see text] 1 fb, well above its MSSM value and in conflict with recent data. Both the [Formula: see text] and gg production mechanisms of H and A can contribute comparably to this. We examine the dependence of the diphoton cross-section [Formula: see text] on the values of [Formula: see text], [Formula: see text] and tan [Formula: see text], under the experimental constraints from the SM-like Higgs couplings hgg and h[Formula: see text] (due to mixing) and from the [Formula: see text] and [Formula: see text] searches. These give [Formula: see text] larger than [Formula: see text] 5 TeV for [Formula: see text] in the range 0.5–1 TeV. We show how to generate the d = 6 effective operator from microscopic (renormalizable) models. This demands the presence of vector-like states beyond the MSSM spectrum (and eventually, but not necessarily a gauge singlet), of mass near [Formula: see text] and thus outside the LHC reach.