Background-Subtracted pi->enu Energy Spectrum: Nearest-Neighbor Energy Sum.
Background-subtracted
+
e+
e
positron energy spectrum. The ADC values
for the calorimeter module with the maximum energy and its nearest neighbors
are summed. A simplified GEANT simulation with the single global high-energy threshold for all
calorimeter clumps is shown in a full line histogram.
Background-Subtracted pi->enu Timing Spectrum.
Background-subtracted
+
e+
e
positron timing spectrum. A fit to the exponential decay function with
+=26.03 ns
is shown superimposed on the histogram.
pi->pi0enu Events: CsI Energy Spectrum.
The
+
0e+
e
energy spectrum.
The sum of energies of two calorimeter clumps that best fit the
0
hypotesis is shown together with the Monte Carlo simulation of the ADC lineshape.
The energy scale and the calorimeter resolutions used in a GEANT program are fixed by the
+
e+
e data.
pi->pi0enu Events: CsI Timing Spectrum.
The
+
0e+
e
timing spectrum.
A fit to the exponential decay curve with
+=26.03 ns
is plotted as a full line.
pi->pi0enu Events: g-g Opening Angle.
The
+
0e+
e
events sample:
-
opening angle. A GEANT simulation prediction is shown with full line histogram.
pi->pi0enu Events: Signal-to-Background Ratio.Signal-to-background ratio for the pion beta decay events. The full line represents an independent fit to the signal lineshape measured with SCX events plus the superimposed random background.
pi->enug Events: Signal-to-Background Ratio: 1-Arm HT Trigger.
Signal-to-background ratio for the 1-arm high threshold trigger with one minimum ionizing and one
neutral particle inside the delayed
gate. Software cuts imposed on the high-threshold
calorimeter trigger are: 2E
/m
> 0.9, Ee+> 14.7 MeV and
e
> 143o.
The full line represents an independent fit to the signal lineshape measured
with SCX events plus the superimposed random background.
pi->enug Events: Signal-to-Background Ratio: 2-Arm HT Trigger.
Signal-to-background ratio for the 2-arm high threshold trigger with one minimum ionizing and one
neutral particle inside the delayed
gate. Software cuts imposed on the high-threshold
calorimeter trigger are: 2E
/m
> 0.9, Ee+> 14.7 MeV and
e
> 143o.
The full line represents an independent fit to the signal lineshape measured
with SCX events plus the superimposed random background.
pi->enug Events: Invariant Mass
Background-subtracted histogram of
ER=Ee+E+
| pe+p| kinematic variable.
The positron direction is determined from the MWPC data, and the photon momentum from
the appropriately weighted CsI calorimeter ADCs. The predicted ER spectrum calculated in
a GEANT simulation is represented by a full line histogram.
mu->enunug Events: Signal-to-Background Ratio.
Signal-to-background ratio for the events with one minimum ionizing and one
neutral particle inside the delayed
gate. Software cuts imposed on the low-threshold
calorimeter trigger are: E > 10 MeV,
Ee+> 14.7 MeV and
e
> 30o.
mu->enunug Events: Invariant Mass
Background-subtracted histogram of
ER=Ee+E+
| pe+p| kinematic variable.
The positron direction is determined from the MWPC data, and the photon momentum from
the appropriately weighted CsI calorimeter ADCs. The predicted ER spectrum calculated in
a GEANT simulation is represented by a full line histogram.