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Title of Journal: J High Energ Phys

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Abbravation: Journal of High Energy Physics

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Springer-Verlag

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10.1016/0956-7135(93)90255-M

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1029-8479

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Light Higgsino from axion dark radiation

Authors: Kwang Sik Jeong Fuminobu Takahashi
Publish Date: 2012/08/02
Volume: 2012, Issue: 8, Pages: 17-
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Abstract

The recent observations imply that there is an extra relativistic degree of freedom coined dark radiation We argue that the QCD axion is a plausible candidate for the dark radiation not only because of its extremely small mass but also because in the supersymmetric extension of the PecceiQuinn mechanism the saxion tends to dominate the Universe and decays into axions with a sizable branching fraction We show that the Higgsino mixing parameter μ is bounded from above when the axions produced at the saxion decays constitute the dark radiation μ ≲ 300 GeV for a saxion lighter than 2m W and μ less than the saxion mass otherwise Interestingly the Higgsino can be light enough to be within the reach of LHC and/or ILC even when the other superparticles are heavy with mass about 1 TeV or higher We also estimate the abundance of axino produced by the decays of Higgsino and saxion

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Other Papers In This Journal:
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  21. Higgs mediation with strong hidden sector dynamics
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