Etude et impact du bruit de fond corrélé pour la mesure de l'angle ...

4.2 ¯⌫ e signal selection 85
Prompt vertex Z 2 position
Delayed vertex Z 2 position
z (mm)
2000
Double Chooz Preliminary
z (mm)
2000
Double Chooz Preliminary
1000
1000
0
0
-1000
-1000
-2000
-2000
0 500 1000 1500 2000 2500 3000 3500 4000
2
2 (mm )
3
×10
0 500 1000 1500 2000 2500 3000 3500 4000
2
2 (mm )
3
×10
tel-00821629, version 1 - 11 May 2013
Figure 4.7: Vertex distributions for prompt (left) and delayed (right) events.
The vertices are limited in the target by the presence of Gd, which implicitly
define the target as the fiducial volume for ¯⌫ e searches through neutron
capture on Gd.
Figure 4.8: Energy correlation between prompt and delayed events. The
y-axis shows the Gd-peak between [7, 9] MeV and its Compton edge extending
to low energies. The x-axis shows the prompt spectrum between
[0.7, 15] MeV with a maximum at about 3 MeV. The red box represent the
energy region where ¯⌫ e candidates are selected.