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Constraints on Unparticle Interactions from Invisible Decays of Z,
Quarkonia and Neutrinos | | Shao-Long Chen
; Xiao-Gang He
; Ho-Chin Tsai
; | | Date: |
2 Jul 2007 | | Abstract: | Unparticles ($U$) interact weakly with particles. The direct signature of
unparticles will be in the form of missing energy. We study constraints on
unparticle interactions using totally invisible decay modes of $Z$, vector
quarkonia $V$ and neutrinos. The constraints on the unparticle interaction
scale $Lambda_U$ are very sensitive to the dimension $d_U$ of the
unparticles. From invisible $Z$ and $V$ decays, we find that with $d_U$ close
to 1 for vector $U$, the unparticle scale $Lambda_U$ can be more than $10^4$
TeV, and for $d_U$ around 2, the scale can be lower than one TeV. From
invisible neutrino decays, we find that if $d_U$ is close to 3/2, the scale
can be more than the Planck mass, but with $d_U$ around 2 the scale can be as
low as a few hundred GeV. We also study the possibility of using $V (Z) o
gamma + U$ to constrain unparticle interactions, and find that present data
give weak constraints. | | Source: | arXiv, arxiv.0707.0187 | | Services: | Forum | Review | PDF | Favorites | |
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