PUB - Publikationen an der Universität Bielefeld

Extending the Higgs sector of the MSSM by triplets alleviates the little hierarchy problem and naturally allows for enhancements in the diphoton decay rate of the lightest CP-even Higgs h. In the present paper we analyze in detail the Higgs phenomenology of this theory with m(h) similar or equal to 126GeV. We mostly focus on a light Higgs sector where the pseudoscalar A, the next-to-lightest CP-even scalar H and the charged H-+/- Higgses are naturally at the electroweak scale. It turns out that for any value m(A) greater than or similar to m(h) there is a parameter region at small tan beta where the CP-even Higgs sector appears at colliders as the SM one, except for loop-induced corrections. Notably the existence of this SM-like point, which is absent in the MSSM, is shared with supersymmetric theories where there are extra singlets. We also highlight a second parameter region at small m A and small tan beta where the h signal strengths, diphoton channel included, are SM-like except those of bottoms and taus which can have at most a 10-15% splitting. Improvements in the A and H-+/- searches are worthwhile in order to discriminate this scenario from the SM.