Signals of Unparticles in Low Energy Parity Violation and NuTeV Experiment

TL;DR

This paper investigates how unparticle physics could influence low energy parity violation experiments and the NuTeV anomaly, proposing that unparticles might explain observed discrepancies within certain parameter regions.

Contribution

It introduces the potential signals of unparticles in atomic parity violation and NuTeV results, identifying parameter spaces where unparticles can account for the NuTeV anomaly.

Findings

Unparticle effects could be observed in atomic parity violation if measurement uncertainties are sufficiently low.

NuTeV constraints on unparticle parameters are detailed and consistent with other experimental bounds.

Unparticles could explain the NuTeV anomaly within specific parameter regions, possibly without other contributions.

Abstract

We have studied the possible signals of unparticle in atomic parity violation(APV) along an isotope chain and in the NuTeV experiment. The effects of unparticle physics could be observed in APV, if the uncertainty in relative neutron/proton radius shift $\delta(\Delta\frac{R_N}{R_P})$ is less than a few times $10^{-4}$ by measuring the parity violating electron scattering. The constraints imposed by NuTeV experiment on unparticle physics are discussed in detail. If the NuTeV results are confirmed by future experiments, we suggest that unparticle could account for a part of NuTeV anomaly. There exist certain regions for the unparticle parameters ($\Lambda_{\cal U}$, $d_{\cal U}$, $c_{V{\cal U}}$ and $c_{A{\cal U}}$), where the NuTeV discrepancy could be completely explained by unparticle effects and the strange quark asymmetry, even with or without the contributions from the isoscalarity violation etc. It is remarkable that these parameter regions are consistent with the constraints from $b\to s\gamma$