Neutron complementary studies and neutral pion reconstruction. - - PowerPoint PPT Presentation

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Neutron complementary studies and neutral pion reconstruction. - - PowerPoint PPT Presentation

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Neutron complementary studies and neutral pion reconstruction. HPgTPC Meeting Eldwan Brianne DESY Hamburg, 14 th May 2019 Current status. Brief summary Software Added few more options in the event display -> cluster display (with

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SLIDE 1

Neutron complementary studies and neutral pion reconstruction.

Eldwan Brianne DESY Hamburg, 14th May 2019

HPgTPC Meeting

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SLIDE 2

Current status.

2 Page

Brief summary

Software

  • Added few more options in the event display -> cluster

display (with axis), tracks…

  • Track propagation calculation to ECAL Barrel and

Endcap for track-cluster associations

  • Tracking optimizations, bug corrections…

Other

  • Started an ECAL documentation (Note for DocDB)

Eldwan Brianne | HPgTPC meeting | 14/05/2019 Proton Muon Pion

𝛏

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SLIDE 3

Neutron energy reconstruction.

3 Page

Reminder and setup

Goals

  • Neutron energy reconstruction via TOF -> very critical
  • Improves neutrino energy reconstruction
  • Provides an handle to probe Ξ½-Ar interactions
  • If demonstrated -> provides a direct constrain on Ξ½Β΅-CC

energy spectrum Setups

  • Looking at 3 setups
  • Different Sc thickness (5 and 10 mm) - keeping ECAL

thickness the same (80 and 45 layers)

  • Enhance the neutron response with B10 doping (5% in

mass) for the 5 mm case

  • All have similar geometry -> HPgTPC + PV (0.5 X0) + ECAL
  • Shooting neutrons at distance of 1 and 3 m from the ECAL -

KE between 20 to 900 MeV

  • Looking at the first hit in time above 3 MeV

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 4

Neutron energy reconstruction.

4 Page

First Setup

First Setup

  • 2 mm Cu + 5 mm Sc (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters

Eldwan Brianne | HPgTPC meeting | 14/05/2019

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Efficiency

> 3 MeV

hit

Reco level: At least one E All interactions First interactions Rescatters and others

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SLIDE 5

Neutron energy reconstruction.

5 Page

First Setup

First Setup

  • 2 mm Cu + 5 mm Sc (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters
  • Energy reconstruction
  • @ 50 MeV: large fraction at -1 (very delayed events due

to nucleus de-excitations)

  • @ 400 MeV: Rescatter get more pronounced
  • Gets more and more pronounced at higher KE energies
  • Systematic bias of the energy reconstruction to the left

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

500 1000 1500 2000 2500 3000

Nevts

80 modules, 300 cm lever arm Reco level, KE = 50 MeV All interactions First interaction Rescatters and others

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

500 1000 1500 2000 2500

Nevts

80 modules, 300 cm lever arm Reco level, KE = 400 MeV All interactions First interaction Rescatters and others

Eldwan Brianne | HPgTPC meeting | 14/05/2019

slide-6
SLIDE 6

Neutron energy reconstruction.

6 Page

First Setup

First Setup

  • 2 mm Cu + 5 mm Sc (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters
  • Energy reconstruction
  • @ 50 MeV: large fraction at -1 (very delayed events due

to nucleus de-excitations)

  • @ 400 MeV: Rescatter get more pronounced
  • Gets more and more pronounced at higher KE energies
  • Systematic bias of the energy reconstruction to the left
  • Overall picture
  • Bias increases with KE - RMS slightly increases
  • Adding rescatters worsen the bias and resolution

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 βˆ’ 0.1 0.2 0.3 0.4 0.5 0.6

Reco level: Bias and resolution All -bias 1st -bias scatter -bias All resolution 1st resolution scatter resolution

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 7

Neutron energy reconstruction.

7 Page

Second Setup

Second Setup

  • 2 mm Cu + 5 mm Sc with 5% B10 in weight (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters
  • Slight improvement below 200 MeV -> mostly due to

gamma from neutron capture with the B10

Eldwan Brianne | HPgTPC meeting | 14/05/2019

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Efficiency

> 3 MeV

hit

Reco level: At least one E All interactions First interactions Rescatters and others

slide-8
SLIDE 8

Neutron energy reconstruction.

8 Page

Second Setup

Second Setup

  • 2 mm Cu + 5 mm Sc with 5% B10 in weight (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters
  • Slight improvement below 200 MeV -> mostly due to

gamma from neutron capture with the B10

  • Energy reconstruction
  • @ 50 MeV: smaller fraction at -1
  • @ 400 MeV: Rescatter get more pronounced
  • Rescatters seem more prononced
  • Visible peak around -0.5 -> may be due to delayed

neutron capture in B10 (need to check)

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

500 1000 1500 2000 2500 3000

Nevts

, 300 cm lever arm

10

80 modules, 5% B Reco level, KE = 50 MeV All interactions First interaction Rescatters and others

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

200 400 600 800 1000 1200 1400 1600 1800

Nevts

, 300 cm lever arm

10

80 modules, 5% B Reco level, KE = 400 MeV All interactions First interaction Rescatters and others

Eldwan Brianne | HPgTPC meeting | 14/05/2019

slide-9
SLIDE 9

Neutron energy reconstruction.

9 Page

Second Setup

Second Setup

  • 2 mm Cu + 5 mm Sc with 5% B10 in weight (80 layers)
  • Overall efficiency of above 50-60%
  • Mostly dominated by rescatters
  • Slight improvement below 200 MeV -> mostly due to

gamma from neutron capture with the B10

  • Energy reconstruction
  • @ 50 MeV: smaller fraction at -1
  • @ 400 MeV: Rescatter get more pronounced
  • Rescatters seem more prononced
  • Visible peak around -0.5 -> may be due to delayed

neutron capture in B10 (need to check)

  • Overall picture
  • 1st interaction resolution more flat
  • Very similar to 5 mm Sc w/o B10

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 βˆ’ 0.1 0.2 0.3 0.4 0.5 0.6

Reco level: Bias and resolution All -bias 1st -bias scatter -bias All resolution 1st resolution scatter resolution

Eldwan Brianne | HPgTPC meeting | 14/05/2019

slide-10
SLIDE 10

Neutron energy reconstruction.

10 Page

Third Setup

Third Setup

  • 2 mm Cu + 10 mm Sc (45 layers)
  • Overall efficiency of above 50-60%
  • Still dominated by rescatters but smaller contribution ->

mainly due to less layers

  • Slight improvement at low KE for first interactions?

Eldwan Brianne | HPgTPC meeting | 14/05/2019

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Efficiency

> 3 MeV

hit

Reco level: At least one E All interactions First interactions Rescatters and others

slide-11
SLIDE 11

Neutron energy reconstruction.

11 Page

Third Setup

Third Setup

  • 2 mm Cu + 10 mm Sc (45 layers)
  • Overall efficiency of above 50-60%
  • Still dominated by rescatters but smaller contribution ->

mainly due to less layers

  • Slight improvement at low KE for first interactions?
  • Energy reconstruction
  • @ 50 MeV: smaller fraction at -1 - sharper peak
  • @ 400 MeV: Rescatter get more pronounced
  • Rescatters seem more prononced - double peak ->

needs investigations

  • First interaction peak more gaussian-like

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

200 400 600 800 1000 1200 1400 1600 1800

Nevts

45 modules, 10 mm Sc, 300 cm lever arm Reco level, KE = 50 MeV All interactions First interaction Rescatters and others

1 βˆ’ 0.8 βˆ’ 0.6 βˆ’ 0.4 βˆ’ 0.2 βˆ’ 0.2 0.4 0.6 0.8 1

(Reco - True) / True KE

200 400 600 800 1000 1200 1400 1600

Nevts

45 modules, 10 mm Sc, 300 cm lever arm Reco level, KE = 400 MeV All interactions First interaction Rescatters and others

Eldwan Brianne | HPgTPC meeting | 14/05/2019

slide-12
SLIDE 12

Neutron energy reconstruction.

12 Page

Third Setup

Third Setup

  • 2 mm Cu + 10 mm Sc (45 layers)
  • Overall efficiency of above 50-60%
  • Still dominated by rescatters but smaller contribution ->

mainly due to less layers

  • Slight improvement at low KE for first interactions?
  • Energy reconstruction
  • @ 50 MeV: smaller fraction at -1 - sharper peak
  • @ 400 MeV: Rescatter get more pronounced
  • Rescatters seem more prononced - double peak ->

needs investigations

  • First interaction peak more gaussian-like
  • Overall picture
  • Similar conclusions as 5 mm Sc
  • Bias and resolution slightly more flat

100 200 300 400 500 600 700 800 900

Neutron kinetic energy [MeV]

0.1 βˆ’ 0.1 0.2 0.3 0.4 0.5 0.6

Reco level: Bias and resolution All -bias 1st -bias scatter -bias All resolution 1st resolution scatter resolution

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 13

Conclusions and Outlook.

13 Page

Next steps (for neutrons)

  • Neutron energy reconstruction is challenging but possible
  • Increase of scintillator thickness may improve the efficiency

at lower neutron KE

  • Number of layer will influence the number of rescatters ->

less would improve the Eres

  • Loaded-boron Sc -> may be a very nice solution to improve

efficiency at low neutron KE + Can we differentiate proton recoil from gamma emissions by timing?

  • Next steps:
  • Looking at MC in more details to get a better

understanding

  • Investigate efficiency and purity in background

environment

  • Investigate Gadolinium coating (would not change
  • ptical properties of the Sc) and Lead absorber

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 14

First look into neutral pion reconstruction.

14 Page

Motivation

  • Identification of pi0s to constrain pi0 background to nue

events

  • Provide a constrain on the pi0 misID in the LArTPC
  • Provide a high purity sample of NC pi0 events to study

inclusive and exclusive neutrino interaction cross sections - > can yield information about nu-nucleon interactions

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 15

First look into neutral pion reconstruction.

15 Page

Setup and method

  • Shooting pi0s between 0 and the TPC radius at intervals of

15 cm (x position fixed)

  • Simple Method (no MC info used):
  • Take the two most energetic clusters (some case have

more than two clusters)

  • Take the direction from the cluster main axis and

calculate the PCA between the two cluster axis

  • Calculate the angle between the two cluster axis and

reconstruct the pi0 mass

  • Calculate the distance between the true vertex and the

geometrical determined one

  • Chi2 minimization can be done after using the energy

and geometrical information combined

  • Very preliminary study

Eldwan Brianne | HPgTPC meeting | 14/05/2019 Cluster 1 - Main axis Cluster 2 - Main axis PCA

ΞΈ

Truth Cluster 1 - CoG Cluster 2 - CoG

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SLIDE 16

Conclusions and Outlook.

16 Page

Next steps

  • Starting to investigate neutral pion reconstruction

capabilities with the current detector design

  • Need more optimizations
  • Use of time information combined with determined

vertex?

  • Need to perform same study with backgrounds…

Eldwan Brianne | HPgTPC meeting | 14/05/2019

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SLIDE 17

Backup Slides.