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Study of the ND Data/MC for the CC analysis

Study of the ND Data/MC for the CC analysis. October 14, 2005 MINOS collaboration meeting M.Ishitsuka Indiana University. Motivation. Check of. Event reconstruction (track, shower) Detector performance MC (neutrino interaction, nuclear effect, B-field)

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Study of the ND Data/MC for the CC analysis

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  1. Study of the ND Data/MC for the CC analysis October 14, 2005 MINOS collaboration meeting M.Ishitsuka Indiana University

  2. Motivation Check of • Event reconstruction (track, shower) • Detector performance • MC (neutrino interaction, nuclear effect, B-field) • Beam status (vertex, direction, spectrum) • Stability of data How should we use ND Data in analysis?  Measurement of neutrino spectrum and y by the ND data

  3. Data/MC and cuts in this talk R1.18 LE, pME and pHE Data/MC 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

  4. Select CC enriched sample (PID by David) R1.18 LE pME pHE LE data (March) 511.1+/-11.0  384.3+/-9.5 LE data 486.7+/-2.4  365.6+/-2.1 LE MC 537.1+/-4.4(86.3%)  423.9+/-3.9(95.8) pME data 911.8+/-13.3  655.3+/-11.3 pME MC 1022.7+/-8.6 (85.0)  781.1+/-7.5 (96.4) pHE data 1395.8+/-9.4  988.7+/-7.9 pHE MC 1521.8+/-12.5 (83.9)  1151.8+/-10.9 (96.8) Data (March) Data MC Data MC Data MC CC NC #events/1017POT before and after PID cut (CC fraction %) NC anti-n CC efficiency -9.3% NC miss-ID -16.1% -14.2%

  5. March Data: green boxes June-Sep. Data: black points MC: red lines vertex and end point LE R1.18 Track vertex x Track vertex y Track vertex z Track end x Track end y Track end z

  6. vertex and end point Data: black points MC: red lines pME R1.18 Track vertex x Track vertex y Track vertex z Track end x Track end y Track end z

  7. vertex and end point Data: black points MC: Red lines pHE R1.18 Track vertex x Track vertex y Track vertex z Track end x Track end y Track end z

  8. Track momentum R1.18 LE pME pHE Track length (fully contained) Data MC Data MC March Data Data MC Curvature NC anti-n NC anti-n NC anti-n

  9. Angular difference of track from beam direction R1.18 LE pME pHE March Data Data MC Data MC Data MC QE NC Suppression in forward direction (low-Q2)  need additional cut to identify the source Reco. Y < 0.2 for LE  QE enriched sample Reco. Y > 0.2 for pME and pHE  DIS enriched sample

  10. Angular difference of track from beam direction for QE and DIS enriched sample R1.18 LE pME pHE Data MC Data MC Data MC Reco. y>0.2 Reco. y<0.2 Reco. Y>0.2 DIS QE DIS 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 QE Reco. Y<0.2

  11. Reconstructed shower energy and y R1.18 LE pME pHE Shower energy = NtpSRShower->ph.linCCgev Data MC Data MC March Data Data MC QE RES DIS NC QE RES DIS NC QE RES DIS NC y

  12. Reconstructed En (= Em + Eshw) R1.18 LE pME pHE March Data Data MC W/ syst. Data MC W/ syst. Data MC W/ syst. QE RES DIS NC QE RES DIS NC QE RES DIS NC Peak position: (Data-MC)/MC • Better agreement than Ely plots W/ nuclear effect (pME and pHE) • ~1 GeV shift still exist  better agreement W/ de-weighted shower energy

  13. Beam profile after reconstruction and comparison with FD spectrum (reco. En) R1.18 LE Rbeam < 10cm Rbeam < 30cm Rbeam < 50cm Data MC (ND) Spectrum at FD Data MC (ND) Spectrum at FD Data MC (ND) Spectrum at FD • good agreement in all regions • Need more statistic of MC for more detailed study

  14. Measurement of neutrino spectrum and y by the ND data • motivation efficiency Flux Fiducial mass cross-section Parameters  measure by the ND data • procedure True y dEm (10%) and dEshw (10%) are also considered in fit True En

  15. Data and bin in this analysis R1.18 LE Reco. y > 0.8 Data 2.20x1018pot MC 2.80x1018pot 0.6 < y < 0.8 0.5 < y < 0.6 • Beam quality cut • W/ reconstructed track • R<1m & 1<z<5 m • DP’s PID > -0.2 0.4 < y < 0.5 0.3 < y < 0.4 0.2 < y < 0.3 Data: black MC: red (normalized by POT) 0.1 < y < 0.2 Reco. y < 0.1 c2 = 919.2/152d.o.f. Reconstructed En

  16. MC parameters bin and profile NC (8) CC (8x4) True y QE RES DIS True En

  17. Result of fit (1-s=20% for all parameters) Data: black MC: red (normalized by POT) Best fit: blue Reco. y > 0.8 0.6 < y < 0.8 c2 = 136.6/152d.o.f. 0.5 < y < 0.6 Best-fit parameters dEm=+5%, dEshw=-13% 0.4 < y < 0.5 0.18 NC -0.1 0.3 < y < 0.4 0.2 < y < 0.3 CC 0.1 < y < 0.2 Reco. y < 0.1 Reconstructed En

  18. Should be free parameters? Data: black MC: red (normalized by POT) Best fit: blue Reco. y > 0.8 0.6 < y < 0.8 c2 = 107.2/112d.o.f. 0.5 < y < 0.6 Best-fit parameters dEm=+5%, dEshw=-13% 0.4 < y < 0.5 0.3 NC -0.5 0.3 < y < 0.4 0.2 < y < 0.3 CC 0.1 < y < 0.2 Reco. y < 0.1 Reconstructed En

  19. 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 E scale ND FD FD/ND error

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