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Constraints from Solar and Reactor Neutrinos on Unparticle Long-Range Forces | | M.C. Gonzalez-Garcia
; P.C. Holanda
; R. Zukanovich Funchal
; | | Date: |
10 Mar 2008 | | Abstract: | We have investigated the impact of long-range forces induced by unparticle
operators of scalar, vector and tensor nature coupled to fermions in the
interpretation of solar neutrinos and KamLAND data. If the unparticle couplings
to the neutrinos are mildly non-universal, such long-range forces will not
factorize out in the neutrino flavour evolution. As a consequence large
deviations from the observed standard matter-induced oscillation pattern for
solar neutrinos would be generated. In this case,severe limits can be set on
the infrared fix point scale, $Lambda_u$, and the new physics scale, $M$, as a
function of the ultraviolet ($d_{
m UV}$) and anomalous ($d$) dimension of the
unparticle operator. For a scalar unparticle, for instance, assuming the
non-universality of the lepton couplings to unparticles to be of the order of a
few per mil we find that, for $d_{
m UV}=3$ and $d=1.1$, $M$ is constrained to
be $M> 10^{9}$ TeV ($M> 10^{10}$ TeV) if $Lambda_u =$ 1 TeV (10 TeV). For
given values of $Lambda_u$ and $d$, the corresponding bounds on $M$ are $sim
200$ ($sim 8/sqrt{Lambda_u}$) times more stringent for vector (tensor)
unparticles as compared to the scalar case. Conversely, these results can be
translated into severe constraints on universality violation of the fermion
couplings to unparticle operators with scales which can be accessible at future
colliders. | | Source: | arXiv, 0803.1180 | | Services: | Forum | Review | PDF | Favorites | |
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