Study of Charged-Current neutrino interactions on water with nuclear - - PowerPoint PPT Presentation

▶
study of charged current neutrino interactions on water
SMART_READER_LITE
LIVE PREVIEW

Study of Charged-Current neutrino interactions on water with nuclear - - PowerPoint PPT Presentation

Jan 16, 2023 420 likes •735 views

NINJA Study of Charged-Current neutrino interactions on water with nuclear emulsion in the NINJA experiment Ayami Hiramoto (Kyoto Univ.) Y . Suzuki, T.Fukuda, T,Nakaya for the NINJA collaboration 2019.09.09 2

slide-1
SLIDE 1

Study of Charged-Current neutrino interactions on water with nuclear emulsion in the NINJA experiment

Ayami Hiramoto (Kyoto Univ.) Y.Suzuki, T.Fukuda, T,Nakaya for the NINJA collaboration 2019.09.09

  • ・ NINJA
slide-2
SLIDE 2

Introduction

2 CCQE 2p2h (multi-nucleon)

  • Neutrino-nucleus interaction is one of the major sources of the

uncertainty for neutrino oscillation experiments.

  • 2p2h (multi-nucleon) interactions mimic the CCQE signals.
  • Direct measurement of low momentum protons (and pions)

is very important.

Reconstructed Neutrino Energy (MC)

slide-3
SLIDE 3

GeV/c 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 a.u. 100 200 300 400 500 600 700 800 900

CCQE 2p2h high 2p2h low

NINJA

  • Neutrino Interaction research with Nuclear emulsion and

J-PARC Accelerator.

  • Water target (same as SK) detector @ T2K near detector hall
  • Emulsion: 3D tracking device, sub-micron position resolution.

3

H2O measurement with ~200MeV/c proton threshold

  • Phys. Rev. D 98, 032003 (2018)

Proton Momentum [GeV/c]

Proton momentum @NINJA position @T2K ND280

slide-4
SLIDE 4

Detectors

ECC water + film MRD INGRID or Baby MIND (T2K near detectors) iron + scintillator Time stamper Emulsion shifter or scintillator-based tracker

ν

Emulsion doesn’t have time resolution

4

slide-5
SLIDE 5

ECC (Emulsion cloud chamber)

  • Water target layers, emulsion film + iron plate tracking layers
  • Position, Angle and Energy deposit (blackness) of the tracks

at each plate are provided.

5

ν

Water (2mm)

2cm

slide-6
SLIDE 6

What we measure?

  • Charged particles: mu, charged-pi, proton (, electron)

=> Track multiplicity of charged particles

  • Pβ (momentum) estimation by Multiple Coulomb Scattering
  • Particle identification using energy deposit

=> Momentum & angle distribution of mu, pi, proton

6

Multiple Coulomb scattering in ECC

water

Iron plate (500µm)

slide-7
SLIDE 7

NINJA Beam exposure

PTEP，063C02 (2017) PTEP，063H02 (2017)

7

NEUT5.4.0 + GEANT4 3kg water, 0.7*1021POT anti-nu Today we only have 70% of all data. Data MC ① Pilot run (2014) Detector test run with emulsion shifter -> published ② Test runs 65kg iron target run, 2016 nu + anti-nu -> next talk Water target test run, 2017-2018 anti-nu -> my talk ③ Physics Run (2019) 75kg water -> Data taking from this Nov. Under preparation

slide-8
SLIDE 8

Neutrino Event Candidates

8

All muon ID tracks 10,741

1cm

ECC starting 250 Sand muon H2O layer starting 97 Interactions on H2O 69 Fe starting Interactions on emulsion, base Miss connection Muon momentum consistency check 62

ν

slide-9
SLIDE 9

[GeV/c]

ν

E 1 2 3 4 5 6 7 8 9 10 POT

21

events/10

10

10

11

10

12

10

13

10

14

10

15

10

16

10

17

10

numu numubar nue nuebar

# of Charged Particle Tracks 1 2 3 4 5 6 7 8 9 10 events 10 20 30 40 50 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

Track Multiplicity

  • Since it was anti-neutrino run, most events are single track events.

Track Criteria:

  • |tanθx|≦1.3, |tanθy|≦1.3, Number of emulsion layers ≧ 2

(↑ will be increased to |tanθ|<4.0 at physics run)

9 Total: 62 events (MC: 66.2) MC is normalized by POT with the estimated detector efficiency

Neutrino Flux (MC) Track multiplicity

Anti-neutrino mode @ on-axis Work in Progress

slide-10
SLIDE 10

θ Muon cos 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Number of events 5 10 15 20 25 30 muon (numubar) muon (numu) pion (numubar) pion (numu) proton (numubar) proton (numu) Muon Momentum [GeV/c] 0.2 0.4 0.6 0.8 1 events 10 20 30 40 50 60

muon pion proton

µ

ν

Muon Tracks

  • Muons are limited by acceptance of the MRD.
  • MRD: 6.5cm*9 iron plates => most muons are penetrating tracks
  • Require to penetrate at least two iron plates at MRD.

10

Muon angle

Pµ estimated from MRD range

Work in Progress Work in Progress

slide-11
SLIDE 11

Particle Identification

  • Blackness of a track = Energy deposit
  • Proton-like / Pion–like separation is performed by Likelihood

ratio using blackness parameter.

11 Pβ: 0.2-0.3GeV/c angle: 0.5-0.7 rad Proton: Purity 90.2% Eff. 85.3% Pion: Purity 84.7% Eff. 89.8%

Blackness (MC) PID Likelihood ratio (MC)

Blackness

slide-12
SLIDE 12

# of Protons 1 2 3 4 5 6 7 8 9 10 events 10 20 30 40 50 60 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν # of Pions 1 2 3 4 5 6 7 8 9 10 events 10 20 30 40 50 60 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

  • Our understanding of vertexing efficiency is not sufficient yet.
  • We are trying to confirm all backgrounds, detector efficiency

and systematic uncertainties.

# of Proton/Pion Tracks

12

# of Proton tracks # of Pion tracks

Work in Progress Work in Progress

slide-13
SLIDE 13

Proton Momentum [GeV/c] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 events 2 4 6 8 10 12 14 16 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν Proton Angle [deg] 20 40 60 80 100 120 140 160 180 events 2 4 6 8 10 12 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

Proton Angle and Momentum

  • Protons down to 200MeV/c are detected on water!

13

Proton angle Proton momentum

200MeV/c Work in Progress Work in Progress

slide-14
SLIDE 14

Proton Momentum [GeV/c] 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Proton Angle [deg] 20 40 60 80 100 120 140 160 180

0.2 0.4 0.6 0.8 1

Proton Angle and Momentum

  • Protons down to 200MeV/c are detected on water!

14

Work in Progress

slide-15
SLIDE 15

Pion Momentum [GeV/c] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 events 1 2 3 4 5 6 7 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν Proton Angle [deg] 20 40 60 80 100 120 140 160 180 events 1 2 3 4 5 6 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

  • Pion-like tracks are also detected.

Pion Angle and Momentum

15

Pion angle Pion momentum We will update our results with full data quickly

Work in Progress Work in Progress

slide-16
SLIDE 16

Physics run 2019

  • Data taking from Nov. 2019
  • Placed among T2K-WAGASCI
  • 75kg water target
  • ~0.5*1021POT

=> 3000 CC interactions First goals:

  • # of proton, pion and their momentum/angle distribution
  • Cross section measurement divided by number of protons

and pions

16

H2O: 75kg Fe: 130kg CH: 15kg

emulsion: 30kg

Wall Wall

slide-17
SLIDE 17

Summary and Prospects

  • NINJA measures neutrino interactions on water with 200MeV/c

proton threshold.

  • First measurement of muon, proton and pion kinematics using

water target ECC was shown. => Protons >200MeV/c were detected on water target

  • We will increase statistics (×1.4) and update our results

including all systematic uncertainties. Next talk => Fe ECC test run results

17

slide-18
SLIDE 18

18

slide-19
SLIDE 19

Nuclear Emulsion

  • Photographic films which have sensitivity to charged particles.

=> No time resolution

  • A charged particle passing through emulsion makes AgBr
  • crystals. After developing, we can see silver grains in films.
  • Automatic scanning by microscope provide us position, angle

and dE/dx information of tracks.

19

Nuclear Emulsion

Charged particle Silver grains Developing

slide-20
SLIDE 20

# of Pions 1 2 3 4 5 6 7 8 9 10 events 20 40 60 80 100 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

Fe interactions

20

# of Charged Particle Tracks 1 2 3 4 5 6 7 8 9 10 events 10 20 30 40 50 60 70 80 90 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν # of Protons 1 2 3 4 5 6 7 8 9 10 events 20 40 60 80 100 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν θ Muon cos 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Number of events 10 20 30 40 50 muon (numubar) muon (numu) pion (numubar) pion (numu) proton (numubar) proton (numu)

Muon Angle Track Multiplicity # of Proton tracks # of Pion tracks

slide-21
SLIDE 21

Fe interactions

21

Proton Angle [deg] 20 40 60 80 100 120 140 160 180 events 1 2 3 4 5 6 7 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν Proton Angle [deg] 20 40 60 80 100 120 140 160 180 events 2 4 6 8 10 12 14 16 18 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν Pion Momentum [GeV/c] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 events 2 4 6 8 10 12 14 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν Proton Momentum [GeV/c] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 events 5 10 15 20 25 30 35 CCQE 2p2h CC1pi CC Multi-pi CC Other NC events

µ

ν

Proton Angle Proton Momentum Pion Angle Pion Momentum

slide-22
SLIDE 22

Momentum Reconstruction / PID

22

All tracks from vertices µ candidates

  • thers

Momentum reconstruction using ECC MCS Pβ by ECC MCS PID by VPH If proton, Momentum estimation by ECC range

slide-23
SLIDE 23

Momentum Reconstruction

  • Measure scattering angle at each iron plate (δθi)
  • θ0 is the RMS of δθi
  • Scattering at water and emulsion should be considered as well

23

  • δθ1

δθ2 δθ3 Film Iron Water Film

slide-24
SLIDE 24

Momentum Reconstruction

  • Proton/Pion momentum reconstruction by MCS angle method
  • Measurement error is ~30% for MCS, <10% for Range

24

[GeV/c] β P 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 2 4 6 8 10 12 14

MC true MC recon

Momentum [GeV/c]

Proton momentum (range+MCS)

Momentum [GeV/c] 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 2 4 6 8 10 12 14

MC true MC recon

Pion momentum (MCS only)

slide-25
SLIDE 25

Muon Momentum Reconstruction

  • Muon momentum reconstruction (MC)
  • MCS angle method saturate around 1.5GeV/c

=> coordinate method will be used [Nucl. Instrum. Meth. A574 (2007) 192-198.]

25

Muon momentum [GeV/c] 0.5 1 1.5 2 2.5 3 3.5 4 POT

21

events/200MeV/10 1 2 3 4 5

CCQE 2p2h CC1pi CC Multi-pi CC Other NC

µ

ν

Muon momentum at INGRID mod.4

slide-26
SLIDE 26

Vertex reconstruction efficiency

  • There are several causes to decrease the vertexing efficiency.

We need to check them carefully.

26 Miss connection Film inefficiency Connection inefficiency

slide-27
SLIDE 27

Kink events

  • Some tracks have kink. They could be backward pions.
  • Blackness, momentum, position and angle difference will be

checked.

  • Attaching track search around the kink position is also helpful.

27 Kink or backward pion?

slide-28
SLIDE 28

Short proton backgrounds

  • There are many tracks that have # of plates = 2
  • These tracks are cosmic rays accumulated before the ECC

construction.

  • Chance coincidence of making a vertex to such short tracks

can be happened. (Blackness cut has been applied already.)

28

water

slide-29
SLIDE 29

Manual check

  • We can easily get the z position if it’s a multiple track event.
  • For single track events, track stopping position was checked by

microscope.

29 Water event Emulsion event Base event Iron event Iron Base Emulsion gel Water

slide-30
SLIDE 30

PID

  • PID performance.

30

[GeV/c] β P

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Blackness

100 200 300 400 500 600 700

proton pion

LR

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 2 4 6 8 10 12 14 16 18 20

proton pion

Pβ vs Blackness PID Likelihood ratio