Can a CPT Violating Ether Solve ALL Electron (Anti)Neutrino Puzzles.pdfVIP

a r X i v : h e p - p h / 0 2 0 4 0 7 7 v 3 5 S e p 2 0 0 2 FERMILAB-Pub-02/060-T hep-ph/0204077 Can a CPT Violating Ether Solve ALL Electron (Anti)Neutrino Puzzles? Andre? de Gouve?a Theoretical Physics Division, Fermilab P.O. Box 500, Batavia, IL 60510, USA Abstract Assuming that CPT is violated in the neutrino sector seems to be a viable alternative to sterile neutrinos when it comes to reconciling the LSND anomaly with the remainder of the neutrino data. There are different (distinguishable) ways of incorporating CPT violation into the standard model, including postulating m 6= m?. Here, I investigate the possibility of introducing CPT violation via Lorentz-invariance violating effective operators (“Ether” potentials) which modify neutrino oscillation patterns like ordinary matter effects. I argue that, within a simplified two- flavor–like oscillation analysis and restricting the analysis to the lowest order Lorentz-invariance violating oerators only, one cannot solve the solar neutrino puzzle and LSND anomaly while still respecting constraints imposed by other neutrino experiments, and comment on whether significant improvements should be expected from a three-flavor analysis. If one turns the picture upside down, some of the most severe constrains on such CPT violating terms can already be obtained from the current neutrino data, while much more severe constraints can arise from future neutrino oscillation experiments. 1 Introduction Assuming that neutrinos have a small mass and mix is by far the simplest solution to the two well established Solar [1] and Atmospheric [2] Neutrino Puzzles and the more controversial LSND Anomaly [3]. It is, however, well known that in order to solve all three problems at once, one is required to add new light degrees of freedom to the Standard Model (SM), usually sterile neutrinos. The reason for this is the fact that the Solar Neutrino Puzzle (SNP) requires a neutrino mass-squared difference ?m2 ～ 10?4 eV2, the Atmospheric