SNB Flash Selection Cuts Biswaranjan Behera Colorado State - - PowerPoint PPT Presentation

SNB Flash Selection Cuts

Biswaranjan Behera
 Colorado State University
 December 17, 2019

Low Energy Physics Working Group meeting

• In this talk, we have determined a set of cuts to select supernova flash for my

calorimetry study. We will see shortly how efficiency and purity looks after each cuts.

• History: In the TDR calorimetry resolution plot, we select flash of purity > 0.5 on

events based on Total PE cut (some value for different configuration).

• Here is the list of cuts which will remove on selecting wrong flash.

• no. of hits < 10

• 100 < Delta Y < 100 (Y center - True Y),

• 100 < Delta Z < 100 (Z center - True Z), 


Y width < 60 and Z width < 60

• Efficiency is number of signal correctly selected in the fiducial volume divided by

total number of events in fiducial volume.

• Purity is defined as (selected cut && signal) / selected cut in each events.


2 Biswaranjan Behera | SNB flash selection cuts

Goal

3 Biswaranjan Behera | SNB flash selection cuts

4 Biswaranjan Behera | SNB flash selection cuts

5 Biswaranjan Behera | SNB flash selection cuts

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7

Cut Flow

Cut Efficiency (%)
 Purity (%)
 Nhit 74 96.5 +delta z 73 99.4 +delta y 72 99.7 +y width 72 99.7 +z width 72 99.7

Biswaranjan Behera | SNB flash selection cuts

• These cuts improves resolution as in the TDR.
• We need to understand the inefficiency (10%) when flashes are closer to APA

and also when we move further we are more inefficient.

• My next step is to investigate where the inefficient coming from?
• Any other suggestion or comments will be appreciated.



 
 
 
 Thank You!

8 Biswaranjan Behera | SNB flash selection cuts

Summary

9 Entries
 01
 27
 20 Purity > 0.5
 purity < 0.5 New Marley

Total PE / True E (Reco -True)/True

Correcting the total observed amount of photons for the average number of photons expected per MeV as a function

• f position along the drift direction. 



 Limit study to central set of APAs to avoid effects of walls (300 < z (cm) < 1000, -300 < y (cm) < 300, x(cm) > 20).

Biswaranjan Behera | SNB flash selection cuts

10 20 30 40 50 60

True Neutrino Energy (MeV)

0.1 0.2 0.3 0.4 0.5

Resolution

10 New Marley (PE cut based on purity > 0.5)
 
 MCC11 (TDR plot) Biswaranjan Behera | SNB flash selection cuts

10 20 30 40 50 60

True Neutrino Energy (MeV)

0.1 0.2 0.3 0.4 0.5

Resolution

11 New Marley (PE cut based on purity > 0.5)
 New Marley (removing incorrect flash)
 MCC11 (TDR plot) Biswaranjan Behera | Supernova Performance in New MC