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Summary of Golden Measurements at a $nu$-Factory.pdf

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Summary of Golden Measurements at a $nu$-Factory

a r X i v : h e p - p h / 0 0 0 7 2 8 1 v 2 2 6 J u l 2 0 0 0 hep-ph/0007281 UM-TH-00-19 Summary of Golden Measurements at a ν-Factory A. Cervera aA. Donini b, M.B. Gavela b, J.J. Gomez Ca?denas, a P. Herna?ndez c 1 , O. Mena b and S. Rigolin d aDep. de F??sica Ato?mica y Nuclear and IFIC, Universidad de Valencia, Spain bDep. de F??sica Teo?rica, Universidad Auto?noma de Madrid, Spain cCERN, 1211 Geneve 23, Switzerland dDep. of Physics, University of Michigan, Ann Arbor - MI 48105, USA Abstract The precision and discovery potential of a neutrino factory based on muon storage rings is summarized. For three-family neutrino oscillations, we analyze how to measure or severely constraint the angle θ13, CP violation, MSW effects and the sign of the atmospheric mass difference ?m223. The appearance of “wrong-sign muons” at three reference baselines is considered: 732 km, 3500 km and 7332 km. We exploit the dependence of the signal on the neutrino energy, and include as well realistic background estimations and detection efficiencies. The optimal baseline turns out to be O(3000 km). Key words: NUFACT00, neutrino, oscillations, CP violation, nufactory. The atmospheric [1,2] plus solar [3] neutrino data point to neutrino oscillations and can be easily accommodated in a three-family mixing scenario. The new SuperK data seem to indicate a slight preference for the solar LMA-MSW solution and disfavor oscillations into sterile neutrinos both in the solar and atmospheric sectors [4]. These facts improve the prospectives for a neutrino factory. In ten years from now, the planned experiments will possibly improve the precision in the solar and atmospheric sector and definitively exclude (or confirm) LSND signal. Nevertheless, there is a strong case for going further in the fundamental quest of the neutrino masses and mixing angles 2 . In fact no significant improvement is expected in the knowledge of: 1) the sign of the atmospheric mass difference, ?m223, 2) the angle relating