Constraints on Unparticle Physics from Solar and KamLAND Neutrinos

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dc.creatorAnchordoqui, Luis
dc.creatorGoldberg, Haim
dc.date2007-09-05
dc.date2007-11-02
dc.date.accessioned2026-07-07T11:42:15Z
dc.date.available2026-07-07T11:42:15Z
dc.descriptionInterest has been directed recently towards low energy implications of a non-trivial conformal sector of an effective field theory with an IR fixed point (Λ), manifest in terms of ``unparticles'' with bizarre properties. We re-examine the implications of the limits on decay lifetimes of solar neutrinos for unparticle interactions. We study in detail the fundamental parameter space (Λ, M) and derive bounds on the energy scale M characterizing the new physics. We work strictly within the framework where conformal invariance holds down to low energies. We first assume that couplings of the unparticle sector to the Higgs field are suppressed and derive bounds with Λin the TeV region from neutrino decay into scalar unparticles. These bounds are significant for values of the anomalous dimension of the unparticle operator 1.0 < d < 1.2. For a region of the parameter space, we show that the bounds are comparable to those arising from production rates at high energy colliders. We then relax our assumption, by considering a more natural framework which does not require a priori restrictions on couplings of Higgs-unparticle operators, and derive bounds with Λin meV region from neutrino decay into vector unparticles. Such low scales for the IR fixed point are relevant in gauge theories with many flavors.
dc.descriptionTo be published in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0709.0678
dc.identifierhttp://arxiv.org/abs/0709.0678
dc.identifierPhys.Lett.B659:345-348,2008
dc.identifierdoi:10.1016/j.physletb.2007.11.077
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200821
dc.subjectHigh Energy Physics - Phenomenology
dc.titleConstraints on Unparticle Physics from Solar and KamLAND Neutrinos
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