Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 53 of 237
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2.4 Experimental evidence
Feldman-Cousins Contours for ANN
2 .0 . - - : - - - - - - - - - - - - - - - .
- 90% C.L. Am2>0
1.5 - 90% C.L. Am2<0
- Best Fit Am$2>0
-...... Best Fit Am$2<0
Q. 1.0 CHOOZ 90% limit
c: 2sin 223=1 for CHOOZ
0 0.1 0.2 0.3 0.4
Figure 2.14: The figure shows the allowed region for 2 sin2 (023) sin2(2013) as a function of
the CP violating phase 6 as obtained by MINOS at 90% C.L. in the case of normal hierarchy
in blue and in the case of inverted hierarchy in red. The best fit values in the two cases are
given by the solid black and the hatched black lines. Superimposed is the limit obtained
by the CHOOZ experiment at sin2(023) = 1. The plot is taken from .
the observed event is 2.01- . Other future experiments like NOvA  and T2K 
can put even tighter constraints on the atmospheric neutrino oscillation parameters.
2.4.3 013 and 6
In the case of CPT being conserved, reactor experiments can be sensitive to 013 at the
atmospheric mass splitting by looking at the T, survival probability, as in equation (2.26).
Experiments like Bugey and PaloVerde were placed at a L/E close to the atmospheric one,
but they were not exactly in the optimal conditions. The CHOOZ experiment, a liquid
scintillator detector, was the best located in terms of baseline from a power station and
it is currently the experiment that establishes the best measurement on 013: sin2(2013) <
0.13 at Am23=2.7x10 3 eV2 . Recently MINOS has also performed an appearance
analysis for v, -- v,, giving limits on 013 [62, 63]. Figure 2.14 shows the region allowed for
2 sin2(023) sin2(2013) versus the CP violating phase 6 obtained by MINOS at 90% C.L. in
case of normal or inverted hierarchy. The CHOOZ limit for sin2 (023) = 1 is superimposed.
Future experiments are being built now to provide more accurate information on 013
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Tinti, Gemma Maria & U., /Oxford. Sterile neutrino oscillations in MINOS and hadron production in pC collisions, thesis or dissertation, July 1, 2010; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1015233/m1/53/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.