Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-07-12
Phys.Rev.D76:073012,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
36 pages, 13 figures, revised version accepted in Physical Review D
Scientific paper
10.1103/PhysRevD.76.073012
We study the problem of determination of the sign of Delta m^2_{31}, or the neutrino mass hierarchy, through observations of atmospheric neutrinos in future detectors. We consider two proposed detector types : (a) Megaton sized water Cerenkov detectors, which can measure the survival rates of nu_\mu + \bar{\nu}_\mu and nu_e + \bar{\nu}_e and (b) 100 kton sized magnetized iron detectors, which can measure the survival rates of \nu_\mu and \bar{\nu}_\mu. For energies and path-lengths relevant to atmospheric neutrinos, these rates obtain significant matter contributions from P_{\mu e}, P_{\mu \mu} and P_{ee}, leading to an appreciable sensitivity to the hierarchy. We do a binned \chi^2 analysis of simulated data in these two types of detectors which includes the effect of smearing in neutrino energy and direction and incorporates detector efficiencies and relevant statistical, theoretical and systematic errors. We also marginalize the \chi^2 over the allowed ranges of neutrino parameters in order to accurately account for their uncertainties. Finally, we compare the performance of both types of detectors vis a vis the hierarchy determination.
Gandhi Raj
Ghoshal Pomita
Goswami Srubabati
Mehta Poonam
Sankar Uma S.
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