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Dark Matter and Enhanced Higgs to Di-photon Rate from Vector-like Leptons
- Source :
- JHEP12(2012)064
- Publication Year :
- 2012
-
Abstract
- In this paper, we study an extension of the standard model with a vector-like generation of leptons. This model provides a viable dark matter candidate and a possibility to enhance the Higgs decay rate into a pair of photons. We evaluate constraints from electroweak precision tests and from vacuum stability, and find that the latter provide an upper limit on the lepton Yukawa couplings. A large enhancement of the Higgs di-photon rate can therefore only be obtained when the mass of the lightest charged lepton is close to the LEP limit. The relic density constraint suggests a co-annihilation scenario with a small mass difference between the lightest charged and neutral leptons, which also weakens the LEP limit on the lightest charged lepton mass and allows for larger Higgs di-photon decay rates. Cross sections for direct detection of the dark matter candidate are calculated, and prospects for detecting the new particles at the LHC are discussed briefly.<br />Comment: 22 pages, 8 figures; v2: Updated with new Xenon 100 results, added references; v3: Fixed typo in Eqn. (A.19), published in JHEP
Details
- Database :
- arXiv
- Journal :
- JHEP12(2012)064
- Publication Type :
- Report
- Accession number :
- edsarx.1207.4235
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1007/JHEP12(2012)064