2014/06/05 by Soebur Razzaque, Razzaque, Soebur, A. Yu. Smirnov +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1406.1407
PDFLatex, 14 figures. Discussion of effects of the systematic errors and flavor misidentification on sensitivity to the CP phase expanded; role of uncertainties in the 2 - 3 mixing explored. 3 new figures added
arxiv created 2015/05/19 · arxiv updated 2015/05/21
We explore a possibility to measure the CP-violating phase δ using multi-megaton scale ice or water Cherenkov detectors with low, (0.2 - 1) GeV, energy threshold assuming that the neutrino mass hierarchy is identified. We elaborate the relevant theoretical and phenomenological aspects of this possibility. The distributions of the νμ (track) and νe (cascade) events in the neutrino energy and zenith angle (Eν- θz) plane have been computed for different values of δ. We study properties and distinguishability of the distributions before and after smearing over the neutrino energy and zenith angle. The CP-violation effects are not washed out by smearing, and furthermore, the sensitivity to δ increases with decrease of the energy threshold. The νe events contribute to the CP-sensitivity as much as the νμ events. While sensitivity of PINGU to δ is low, we find that future possible upgrade, Super-PINGU, with few megaton effective volume at (0.5 - 1) GeV and e.g. after 4 years of exposure will be able to disentangle values of δ= π/2,~ π,~ 3π/2 from δ= 0 with "distinguishability" (∼ significance in σ's) Sσtot = (3 - 8),~ (6 - 14),~(3 - 8) correspondingly. Here the intervals of Sσtot are due to various uncertainties of detection of the low energy events, especially the flavor identification, systematics, \it etc. Super-PINGU can be used simultaneously for the proton decay searches.