Constraints on Unparticle Interactions from Invisible Decays of Z, Quarkonia and Neutrinos

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dc.creatorChen, Shao-Long
dc.creatorHe, Xiao-Gang
dc.creatorTsai, Ho-Chin
dc.date2007-07-02
dc.date2007-10-29
dc.date.accessioned2026-07-07T12:23:55Z
dc.date.available2026-07-07T12:23:55Z
dc.descriptionUnparticles ($\U$) 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 $Λ_\U$ 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 $Λ_\U$ 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 $V (Z)\to γ+ \U$ to constrain unparticle interactions, and find that present data give weak constraints.
dc.description12 pages, 4 figures, version to appear in JHEP;
dc.identifierhttps://arxiv.org/abs/0707.0187
dc.identifierhttp://arxiv.org/abs/0707.0187
dc.identifierJHEP 0711:010,2007
dc.identifierdoi:10.1088/1126-6708/2007/11/010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214157
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleConstraints on Unparticle Interactions from Invisible Decays of Z, Quarkonia and Neutrinos
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