How two neutrino superbeam experiments do better than one

被引:57
作者
Barger, V [1 ]
Marfatia, D
Whisnant, K
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[2] Boston Univ, Dept Phys, Boston, MA 02215 USA
[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
关键词
D O I
10.1016/S0370-2693(03)00334-4
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We examine the use of two superbeam neutrino oscillation experiments with baselines less than or equal to 1000 km to resolve parameter degeneracies inherent in the three-neutrino analysis of such experiments. We find that with appropriate choices of neutrino energies and baselines two experiments with different baselines can provide a much better determination of the neutrino mass ordering than a single experiment alone. Two baselines are especially beneficial when the mass scale for solar neutrino oscillations deltam(sol)(2) is greater than or equal to 5 x 10(-5) eV(2). We also examine CP violation sensitivity and the resolution of other parameter degeneracies. We find that the combined data of superbeam experiments with baselines of 295 and 900 km can provide sensitivity to both the neutrino mass ordering and CP violation for sin(2)2theta(13) down to 0.03 for \deltam(atm)(2)\ similar or equal to 3 x 10(-3) eV(2). It would be advantageous to have a 10% determination of \deltam(atm)(2)\ before the beam energies and baselines are finalized, although if \deltam(atm)(2)\ is not that well known, the neutrino energies and baselines can be chosen to give fairly good sensitivity for a range of \deltam(atm)(2)\ (C) 2003 Published by Elsevier Science B.V.
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页码:75 / 86
页数:12
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