Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-22
Phys.Rev. D70 (2004) 073004
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 15 figures. Added NOMAD data to the analysis, one statistical test, and two figures. References and text added. Vers
Scientific paper
10.1103/PhysRevD.70.073004
We investigate adding two sterile neutrinos to resolve the apparent tension existing between short-baseline neutrino oscillation results and CPT-conserving, four-neutrino oscillation models. For both (3+1) and (3+2) models, the level of statistical compatibility between the combined dataset from the null short-baseline experiments Bugey, CHOOZ, CCFR84, CDHS, KARMEN, and NOMAD, on the one hand; and the LSND dataset, on the other, is computed. A combined analysis of all seven short-baseline experiments, including LSND, is also performed, to obtain the favored regions in neutrino mass and mixing parameter space for both models. Finally, four statistical tests to compare the (3+1) and the (3+2) hypotheses are discussed. All tests show that (3+2) models fit the existing short-baseline data significantly better than (3+1) models.
Conrad Janet
Shaevitz Michael
Sorel Michel
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