Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-15
Phys.Rev. D62 (2000) 093014
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 5 EPS figures
Scientific paper
10.1103/PhysRevD.62.093014
We study the effect of non-vanishing masses and mixings among neutrino flavours on the detection of neutrinos from stellar collapse by a water Cerenkov detector. We consider a frame-work in which there are four neutrino flavours, including a sterile neutrino, whose mass squared differences and mixings are constrained by the present understanding of solar, atmospheric and laboratory neutrino detection. We also include the effects of high density matter within the supernova core. Unlike in the three flavour scenario, we find that the number of events due to the dominant process involving electron-antineutrinos changes dramatically for some allowed mixing parameters. Furthermore, contributions from charged-current scattering off oxygen nuclei in the detector can be considerably enhanced due to flavour mixing. We also present a comparison between the two possible scenarios, namely, when only three active neutrino flavours are present and when they are accompanied by a fourth sterile neutrino.
Dutta Gautam
Indumathi D.
Murthy M. V. N.
Rajasekaran Guruswamy
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