Abstract
Both the naturalness of the electroweak symmetry breaking and the resolution of the strong CP problem may require a small Higgsino mass generated by a realization of the DFSZ axion model. Assuming the axino is the lightest supersymmetric particle, we study its implications on and the axion scale. Copiously produced light Higgsinos at collider (effectively only neutral next-to-lightest superparticles pairs) eventually decay to axinos leaving prompt multileptons or displaced vertices which are being looked for at the LHC. We use latest results to derive current limits on and the axion scale. Various Higgsino-axino phenomenology is illustrated by comparing with a standard case without lightest axinos as well as with a more general case with additional light gauginos in the spectrum.
4 More- Received 17 July 2014
DOI:https://doi.org/10.1103/PhysRevD.90.035020
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