Subject: Nolty's thesis on semi-contained neutrinos
From: Bob Nolty (nolty@hep.caltech.edu)
Date: Thu Jan 03 2002 - 20:20:52 EST
Hi all --
I have defended and filed my thesis at Caltech on Semi-Contained
Interactions of Atmospheric Neutrinos in the MACRO Detector. You can
read it at
http://www.hep.caltech.edu/~nolty/thesis.pdf
If you have trouble printing from the PDF (I do), try
http://www.hep.caltech.edu/~nolty/thesis.ps
This is an analysis of the same class of events as in Antonio's `Lecce
Analysis'. The most important results are presented in Figure 5.16,
Figure 6.5, Figure 6.6 and Figure 6.8. My cuts were harder, so I find
a smaller number of events than Antonio. I find 76 events with 96
expected (assuming oscillations), to be compared to Antonio's 154
events with 168 expected (assuming oscillations, and also with 25%
more livetime). I defined my `goodness of fit' parameters for the
Feldman-Cousins ranking procedure independently of previous MACRO
work. My final exclusion region (after combining with Maurizio's
`Bologna Analysis') is not radically different from the official MACRO
low-energy result; it allows somewhat higher Delta-M^2 (0.1 eV^2 as
compared to 0.025 eV^2) and excludes somewhat higher sin^2(2 theta)
(0.5 as compared to 0.35).
Unique features of my analysis include:
* explicit simulation of measured dead time and weekly efficiencies
of each SC channel and each set of 8 ST channels.
* Objectively-determined microcuts, based solely on downgoing muon
performance.
* More conservative cutting to eliminate background from downgoing
muons.
Also of interest is Figure 5.2; while not relevant to this analysis,
it shows something I have not seen elsewhere -- the expected energy
distribution of throughgoing upward muons in the presence of
oscillations (based on my own version of upmu analysis; that for
Teresa's analysis would probably be slightly different). It shows a
minimum around 20 GeV due to the oscillations.
Bob
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