Study of the ND Data/MC for the CC analysis

October 14, 2005 MINOS collaboration meeting

M.Ishitsuka

Indiana University

Motivation

• Event reconstruction (track, shower)• Detector performance• MC (neutrino interaction, nuclear effect, B-field)• Beam status (vertex, direction, spectrum)• Stability of data

Check of

How should we use ND Data in analysis?

Measurement of neutrino spectrum and y by the ND data

Data/MC and cuts in this talk

Data LE: March 4.23x1017pot

LE: June-September (not all) 8.11x1018pot

pME 5.12x1017pot

pHE 1.58x1018pot

MC LE n13xxxL010185 2.80x1018pot

pME n13xxxL100200 1.40x1018pot

pHE n13xxxL250200 9.74x1018pot

MC in all plots are normalized by the POT of the data.

Beam quality cut by using DB (BEAMMONSPILL)

W/ reconstructed track

Reconstructed vertex in {R from beam center<50cm & 1 < z < 3.5 m} DP’s PID > -0.2

R1.18 LE, pME and pHE Data/MC

Select CC enriched sample (PID by David)

pMELE pHE

Data (March)

Data

MC

Data

MC

Data

MC

NCanti-

CC

R1.18

NC

CC efficiency

NC miss-ID

LE data (March) 511.1+/-11.0 384.3+/-9.5LE data 486.7+/-2.4 365.6+/-2.1LE MC 537.1+/-4.4(86.3%) 423.9+/-3.9(95.8)

pME data 911.8+/-13.3 655.3+/-11.3pME MC 1022.7+/-8.6 (85.0) 781.1+/-7.5 (96.4)

pHE data 1395.8+/-9.4 988.7+/-7.9pHE MC 1521.8+/-12.5 (83.9) 1151.8+/-10.9 (9

6.8)

#events/1017POT before and after PID cut (CC fraction %)

-9.3%

-16.1%

-14.2%

vertex and end point

Track end x Track end y Track end z

March Data: green boxes

June-Sep. Data: black points

MC: red linesLE

Track vertex x Track vertex y Track vertex z

R1.18

vertex and end point

Track vertex x Track vertex y Track vertex z

Track end x Track end y Track end z

Data: black points

MC: red linespMER1.18

vertex and end point

Track vertex x Track vertex y Track vertex z

Track end x Track end y Track end z

Data: black points

MC: Red linespHER1.18

Track momentum

Curvature

pMELE pHE

Track length (fully contained)

March Data

Data

MC

Data

MC

Data

MC

NCanti-

NCanti-

NCanti-

R1.18

Angular difference of track from beam direction

pMELE pHE

Reco. Y < 0.2 for LE

QE enriched sample

Suppression in forward direction (low-Q2) need additional cut to identify the source

March Data

Data

MC

Data

MC

Data

MC

QENC

R1.18

Reco. Y > 0.2 for pME and pHE

DIS enriched sample

Angular difference of track from beam direction for QE and DIS enriched sample

pMELE pHE

Reco. QE Q2

Small forward supression in QE enriched sample (LE) strong suppression in K2K & MiniBoone

Forward suppression in DIS enriched sample (pME,pHE) could be explained by Bodek&Yang

Data

MC

Data

MC

Data

MC

QE

R1.18

Data

MCQE

DIS DIS

Reco. y<0.2 Reco. y>0.2 Reco. Y>0.2

Reco. Y<0.2

Reconstructed shower energy and y

Shower energy = NtpSRShower->ph.linCCgev

y

pMELE pHE

March Data

Data

MC

Data

MC

Data

MC

QERESDISNC

QERESDISNC

QERESDISNC

R1.18

Reconstructed E (= E + Eshw)

pMELE pHE

Better agreement than Ely plots W/ nuclear effect (pME and pHE)

~1 GeV shift still exist better agreement W/ de-weighted shower energy

March Data

Data

MC W/ syst.

Data

MC W/ syst.

Data

MC W/ syst.

QERESDISNC

QERESDISNC

QERESDISNC

Peak position: (Data-MC)/MC

R1.18

Beam profile after reconstruction and comparison with FD spectrum (reco. E

LE

good agreement in all regions

Need more statistic of MC for more detailed study

Data

MC (ND)

Spectrum at FD

R1.18

Rbeam < 10cm

Data

MC (ND)

Spectrum at FD

Data

MC (ND)

Spectrum at FD

Rbeam < 30cm Rbeam < 50cm

Measurement of neutrino spectrum and y by the ND data

• motivation MdEEEEN )()()(

Fluxcross-section

efficiency

Fiducial mass

Parameters measure by the ND data

• procedure

2

2

22

22 ))1((

MCData

MCjiData NfN

True ET

rue

yE (10%) and Eshw (10%) are also considered in fit

Data and bin in this analysis

Reco. y < 0.1

Reco. y > 0.8

0.1 < y < 0.2

0.5 < y < 0.6

0.4 < y < 0.5

0.3 < y < 0.4

0.6 < y < 0.8

0.2 < y < 0.3

Reconstructed E

Data 2.20x1018pot

MC 2.80x1018pot

Beam quality cut

W/ reconstructed track

R<1m & 1<z<5 m DP’s PID > -0.2

R1.18 LE

2 = 919.2/152d.o.f.

Data: black

MC: red (normalized by POT)

MC parameters bin and profile

True E

Tru

e y

CC (8x4)

NC (8)

QE

RES

DIS

-0.1

0.18

Result of fit (1-=20% for all parameters)

Reco. y < 0.1

Reco. y > 0.8

0.1 < y < 0.2

0.5 < y < 0.6

0.4 < y < 0.5

0.3 < y < 0.4

0.6 < y < 0.8

0.2 < y < 0.3

Reconstructed E

2 = 136.6/152d.o.f.

Data: blackMC: red (normalized by POT)Best fit: blue

Best-fit parameters

NC

CC

E=+5%, Eshw=-13%

-0.5

0.3

Should be free parameters?

Reco. y < 0.1

Reco. y > 0.8

0.1 < y < 0.2

0.5 < y < 0.6

0.4 < y < 0.5

0.3 < y < 0.4

0.6 < y < 0.8

0.2 < y < 0.3

Reconstructed E

2 = 107.2/112d.o.f.

Data: blackMC: red (normalized by POT)Best fit: blue

NC

CC

Best-fit parameters

E=+5%, Eshw=-13%

summary

• Study of R1.18 ND Data/MC with CC selection• ~10% difference in #events/POT• Data indicate low-Q2 suppression in DIS (pME, pHE)• ~1GeV shift in pME, pHE spectrum• Measurement of neutrino spectrum and y is carried out by

the ND Data

Plan• CC analysis by using the measured spectrum and y

NDFD

FD/ND error

E scale