230 research outputs found
Tau contribution and precision measurement of theta23 at a neutrino factory
We discuss precision measurements of the leading atmospheric parameters at a
standard neutrino factory. The oscillation of the muon and electron neutrinos
(anti-neutrinos) to tau neutrinos (anti-neutrinos) adds to the muon events
sample (both right sign and wrong sign) via leptonic decays of the taus
produced through charge-current interactions in the detector. We focus on how
this contribution affects a precision measurement of the atmospheric mixing
parameters and the deviation of muon neutrino -- tau neutrino mixing from
maximality.Comment: 4 pages, 5 figures, presented by NS at the 11th International
Workshop on Neutrino Factories, Superbeams and Beta Beams (Nufact09), July
20-25, 2009, Illinois Institute of Technology, Chicago, US
Pinning down neutrino oscillation parameters in the 2-3 sector with a mgnetised atmospheric neutrino detector: a new study
We determine the sensitivity to neutrino oscillation parameters from a study
of atmospheric neutrinos in a magnetised detector such as the ICAL at the
proposed India-based Neutrino Observatory. In such a detector that can {\em
separately} count and -induced events, the
relatively smaller (about 5\%) uncertainties on the neutrino--anti-neutrino
flux ratios translate to a constraint in the analysis that results in
a significant improvement in the precision with which neutrino oscillation
parameters such as can be determined. Such an effect is
unique to all magnetisable detectors and constitutes a great advantage in
determining neutrino oscillation parameters using such detectors. Such a study
has been performed for the first time here. Along with an increase in the
kinematic range compared to earlier analyses, this results in sensitivities to
oscillation parameters in the 2--3 sector that are comparable to or better than
those from accelerator experiments where the fluxes are significantly higher.
For example, the precisions on and
achievable for 500 kTon yr exposure of ICAL are
and respectively for both normal and inverted
hierarchies. The mass hierarchy sensitivity achievable with this combination
when the true hierarchy is normal (inverted) for the same exposure is
()
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