Interpreting the LSND anomaly: sterile neutrinos or CPT-violation or...?
Abstract
We first study how sterile neutrinos can fit the 5sigma bar-nu_mu --> bar-nu_e LSND anomaly: 2+2 solutions are strongly disfavoured by solar and atmospheric data, while 3+1 solutions can still give a poor fit (for a specific range of oscillation parameters, to be tested by MiniBooNE). If instead MiniBoone will find no nu_mu --> nu_e signal, we will have a hint for CPT violation. Already now, unlike sterile neutrinos, CPT-violating neutrino masses can nicely accomodate all safe and unsafe data. We study how much CPT must be conserved according to atmospheric and K2K data and list which CPT-violating signals could be discovered by forthcoming solar and long-baseline experiments.
Cite
@article{arxiv.hep-ph/0201134,
title = {Interpreting the LSND anomaly: sterile neutrinos or CPT-violation or...?},
author = {Alessandro Strumia},
journal= {arXiv preprint arXiv:hep-ph/0201134},
year = {2009}
}
Comments
12 pages. Version 2: update about SNO. Version 3: addendum about KamLAND. Version 4: addendum at pages 11,12 discussing how much the recent WMAP data disfavour the 3+1 sterile solution