PT Journal
AU Barenboim, G
   Chun, EJ
   Jung, SH
   Park, WI
TI Implications of an axino LSP for naturalness
SO Physical Review D
JI Phys. Rev. D
PY 2014
BP 035020
EP 12pp
VL 90
IS 3
DI 10.1103/PhysRevD.90.035020
LA English
AB Both the naturalness of the electroweak symmetry breaking and the resolution of the strong CP problem may require a small Higgsino mass μgenerated by a realization of the DFSZ axion model. Assuming the axino is the lightest supersymmetric particle, we study its implications on μand 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 LHC7 + 8 results to derive current limits on μand 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.
ER