Triplet scalars and dark matter at the LHC
We investigate the predictions of a simple extension of the standard model where the Higgs sector is composed of one SU(2)L doublet and one real triplet. We discuss the general features of the model, including its vacuum structure, theoretical and phenomenological constraints, and expectations for Higgs collider studies. The model predicts the existence of a pair of light charged scalars and, for vanishing triplet vacuum expectation value, contains a cold dark matter candidate. When the latter possibility occurs, the charged scalars are long-lived, leading to a prediction of distinctive single charged track with missing transverse energy or double charged track events at the large hadron collider. The model predicts a significant excess of two-photon events compared to SM expectations due to the presence of a light charged scalar.
Additional Information© 2009 The American Physical Society. Received 1 December 2008; published 31 March 2009. We thank T. Han, F. Petriello, P. Langacker, C. P. Yuan and L.-T. Wang for helpful discussions. This work was supported in part by the U.S. Department of Energy contracts DE-FG02-08ER41531 and DE-FG02-95ER40896 in part by the Wisconsin Alumni Research Foundation. K.W. is supported by the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. We would like to thank T. Han for providing private computing package hanlib.
Published - Perez2009p1655Phys_Rev_D.pdf