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26 April 2024 |
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Resolving CP Violation by Standard and Nonstandard Interactions and Parameter Degeneracy in Neutrino Oscillations | | A. M. Gago
; H. Minakata
; H. Nunokawa
; S. Uchinami
; R. Zukanovich Funchal
; | | Date: |
22 Apr 2009 | | Abstract: | In neutrino oscillation with non-standard interactions (NSI) the system is
enriched with CP violation caused by phases due to NSI in addition to the
standard lepton Kobayashi-Maskawa phase delta. In this paper we show that it
is possible to disentangle the two CP violating effects by measurement in the
u_{mu} appearance channel by a near-far two detector setting in neutrino
factory experiments. Prior to the quantitative analysis we investigate in
detail the various features of the neutrino oscillations with NSI, but under
the assumption that only one of the NSI elements, varepsilon_{e mu} or
varepsilon_{e au}, is present. They include synergy between the near and the
far detectors, the characteristic differences between the varepsilon_{e mu}
and varepsilon_{e au} systems, and in particular, the parameter degeneracy.
Finally, we use a concrete setting of muon energy 50 GeV and two magnetized
iron detectors at the two baselines, one at L=3000 km and the other at L=7000
km, each having a fiducial mass of 50 kton to study the discovery potential of
NSI and its CP violation effects. We demonstrate by assuming 4 imes 10^{21}
useful muon decay for both polarities that one can identify non-standard CP
violation down to | varepsilon_{e mu} | simeq ext{several} imes 10^{-4},
and | varepsilon_{e au} | simeq 10^{-3} for sin^2 2 heta_{13} = 10^{-3}
in most of the region of delta. The impact of existence of NSI on measurement
of delta and the mass hierarchy is also worked out. | | Source: | arXiv, 0904.3360 | | Services: | Forum | Review | PDF | Favorites | |
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