Constraints on Unparticle Physics from Solar and KamLAND Neutrinos

Abstract

Interest 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.

To be published in Phys. Lett. B

References in corpus (5)

• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• Flavor Composition and Energy Spectrum of Astrophysical Neutrinos
• Unparticle Physics Effects on D0-anti-D0 Mixing
• B \to K(K^*) missing energy in Unparticle physics

Cited by in corpus (18)

• Unparticle physics at the photon collider
• Cosmological Constraints on Unparticles as Continuous Mass Scalars
• Theoretical Overview of Neutrino Properties
• Test of unparticle long range forces from perihelion precession of Mercury
• Cosmological Unparticle Correlators
• Disentangling the Unparticles with polarized beams at e+e- colliders
• The large CP phase in B(s) - anti-B(s) mixing and Unparticle Physics
• W-pair production in Unparticle Physics
• Unparticle physics with broken scale invariance
• Relaxing the Cosmological Constraints on Unparticle Dark Component
• Thermal Unparticles: A New Form of Energy Density in the Universe
• Higgs Boson Decays into Single Photon plus Unparticle
• Investigation of $B_{u,d}\to (\pi ,K)\pi$ decays within unparticle physics
• Unparticle Effects on Unitarity Constraints from Higgs Boson Scattering
• Unparticles and inflation
• Unparticle-Enhanced Black Holes at the LHC
• Unparticle Searches Through Low Energy Parity Violating Asymmetry
• On Unparticles and K+ to pi+ Missing Energy