TL;DR
This paper proposes unparticles as a viable cold dark matter candidate, showing their relic abundance can match observations and predicting Higgs decays into unparticles for certain mass ranges.
Contribution
It introduces a parity in unparticle physics, enabling unparticles to serve as dark matter and explores their phenomenology related to Higgs decays.
Findings
Unparticle relic abundance matches observed dark matter density.
Higgs boson can decay invisibly into unparticles for certain mass ranges.
Potential for future collider detection of invisible Higgs decays.
Abstract
Once a parity is introduced in unparticle physics, under which unparticle provided in a hidden conformal sector is odd while all Standard Model particles are even, unparticle can be a suitable candidate for the cold dark matter (CDM) in the present universe through its coupling to the Standard Model Higgs doublet. We find that for Higgs boson mass in the range, 114.4 GeV < m_h < 250 GeV, the relic abundance of unparticle with mass 50 GeV < m_U < 80 GeV can be consistent with the currently observed CDM density. In this scenario, Higgs boson with mass m_h < 160 GeV dominantly decays into a pair of unparticles and such an invisible Higgs boson may be discovered in future collider experiments.
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