1 / 83

Teppei Katori for the MiniBooNE collaboration Massachusetts Institute of Technology

First Measurement of Muon Neutrino Charged Current Quasielastic (CCQE) Double Differential Cross Section . PR D81(2010)092005. Teppei Katori for the MiniBooNE collaboration Massachusetts Institute of Technology Elba XI Workshop, Elba, Italy, June 23, 10.

joylyn
Download Presentation

Teppei Katori for the MiniBooNE collaboration Massachusetts Institute of Technology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. First Measurement of Muon Neutrino Charged Current Quasielastic (CCQE) Double Differential Cross Section PRD81(2010)092005 Teppei Katori for the MiniBooNE collaboration Massachusetts Institute of Technology Elba XI Workshop, Elba, Italy, June 23, 10 Teppei Katori, MIT

  2. First Measurement of Muon Neutrino Charged Current Quasielastic (CCQE) Double Differential Cross Section outline 0. NuInt09 summary 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7. Conclusion PRD81(2010)092005 Teppei Katori, MIT

  3. 0. NuInt09 summary NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation Teppei Katori, MIT

  4. 0. NuInt09 summary Today’s talk NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation CCQE double differential cross section Teppei Katori, MIT

  5. 0. NuInt09 summary by Denis Perevalov NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation Flux-averaged NCE p+n differential cross section Teppei Katori, MIT

  6. 0. NuInt09 summary by Colin Anderson NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation NCpo differential cross section (both n and anti-n) Teppei Katori, MIT

  7. 0. NuInt09 summary by Mike Wilking NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation double differential cross section (both pion and muon) Teppei Katori, MIT

  8. 0. NuInt09 summary by Bob Nelson NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation CCpo Q2 distribution (paper will include absolute cross section) Teppei Katori, MIT

  9. 0. NuInt09 summary by Jarek Novak NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation MA1p fit with Q2 distribution for various nuclear models Teppei Katori, MIT

  10. 0. NuInt09 summary by Steve Linden NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation picture wanted CCp+like/CCQElike cross section ratio Teppei Katori, MIT

  11. 0. NuInt09 summary by Joe Grange NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp NuInt09 MiniBooNE results In NuInt09, MiniBooNE had 6 talks and 2 posters 1. charged current quasielastic (CCQE) cross section measurement by Teppei Katori, PRD81(2010)092005 2. neutral current elastic (NCE) cross section measurement by Denis Perevalov, paper in preparation 3. neutral current po production (NCpo) cross section measurement (n and anti-n) by Colin Anderson, PRD81(2010)013005 4. charged current single pion production (CCp+) cross section measurement by Mike Wilking, paper in preparation 5. charged current single po production (CCpo) measurement by Bob Nelson, paper in preparation 6. improved CC1p+ simulation in NUANCE generator by Jarek Novak 7. CCp+/CCQE cross section ratio measurement by Steve Linden, PRL103(2009)081801 8. anti-nCCQE measurement by Joe Grange, paper in preparation • anti-nCCQE Q2 distribution Teppei Katori, MIT

  12. 0. NuInt09 summary by everyone NuInt09, May18-22, 2009, Sitges, Spain All talks proceedings are available on online (open access), http://proceedings.aip.org/proceedings/confproceed/1189.jsp Some realizations from NuInt09 1. Neutrino cross section measurements are the urgent program, mainly, because of their relationship with neutrino oscillation measurements. 2. Importance to use the better models for neutrino interaction generators 3. Importance to provide data with the form available for theorists, this includes, i) detector efficiency is corrected ii) free from reconstruction biases (data as a function of measured quantities) iii) free from model dependent background subtraction e.g.) MC comparison of double differential cross section of NCpo production with En=0.5GeV, angle=60o Teppei Katori, MIT

  13. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  14. 1. Booster Neutrino Beamline MiniBooNE collaboration, PRD79(2009)072002 Booster Target Hall decay region absorber target and horn FNAL Booster detector dirt nm K+ p+ Booster primary beam secondary beam tertiary beam (protons) (mesons) (neutrinos) MiniBooNE extracts 8.9 GeV/c momentum proton beam from the Booster Teppei Katori, MIT

  15. 1. Booster Neutrino Beamline MiniBooNE collaboration, PRD79(2009)072002 Magnetic focusing horn nm target and horn FNAL Booster decay region absorber detector K+ p+ Booster dirt primary beam secondary beam tertiary beam (protons) (mesons) (neutrinos) Protons are delivered to a beryllium target in a magnetic horn (flux increase ~6 times) p- p+ p+ p- Teppei Katori, MIT

  16. 1. Booster Neutrino Beamline MiniBooNE collaboration, PRD79(2009)072002 HARP experiment (CERN) Modeling of meson production is based on the measurement done by HARP collaboration - Identical, but 5% l Beryllium target - 8.9 GeV/c proton beam momentum HARP collaboration, Eur.Phys.J.C52(2007)29 Booster neutrino beamline pion kinematic space HARP kinematic coverage Majority of pions create neutrinos in MiniBooNE are directly measured by HARP (>80%) Teppei Katori, MIT

  17. 1. Booster Neutrino Beamline MiniBooNE collaboration, PRD79(2009)072002 HARP experiment (CERN) Modeling of meson production is based on the measurement done by HARP collaboration - Identical, but 5% l Beryllium target - 8.9 GeV/c proton beam momentum HARP collaboration, Eur.Phys.J.C52(2007)29 HARP data with 8.9 GeV/c proton beam momentum The error on the HARP data (~7%) directly propagates. The neutrino flux error is the dominant source of normalization error for an absolute cross section in MiniBooNE. Teppei Katori, MIT

  18. 1. Booster Neutrino Beamline MiniBooNE collaboration, PRD79(2009)072002 nm target and horn detector FNAL Booster decay region absorber Booster dirt primary beam secondary beam tertiary beam (protons) (mesons) (neutrinos) Predicted nm-flux in MiniBooNE The decay of mesons make the neutrino beam. The neutrino beam is dominated by nm (93.6%), of this, 96.7% is made by p+-decay For all MiniBooNE cross section measurements, neutrino flux prediction is not tuned from our neutrino measurement data. p- p+ K+ p+ p+ p- Teppei Katori, MIT

  19. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  20. MiniBooNE collaboration, NIM.A599(2009)28 2. MiniBooNE detector • The MiniBooNE Detector • - 541 meters downstream of target • - 3 meter overburden • - 12 meter diameter sphere • (10 meter “fiducial” volume) • - Filled with 800 t of pure mineral oil (CH2) • (Fiducial volume: 450 t) • - 1280 inner phototubes, • - 240 veto phototubes • Simulated with a GEANT3 Monte Carlo Teppei Katori, MIT

  21. MiniBooNE collaboration, NIM.A599(2009)28 2. MiniBooNE detector • The MiniBooNE Detector • - 541 meters downstream of target • - 3 meter overburden • - 12 meter diameter sphere • (10 meter “fiducial” volume) • - Filled with 800 t of pure mineral oil (CH2) • (Fiducial volume: 450 t) • - 1280 inner phototubes, • - 240 veto phototubes • Simulated with a GEANT3 Monte Carlo 541 meters Booster Teppei Katori, MIT

  22. MiniBooNE collaboration, NIM.A599(2009)28 2. MiniBooNE detector • The MiniBooNE Detector • - 541 meters downstream of target • - 3 meter overburden • - 12 meter diameter sphere • (10 meter “fiducial” volume) • - Filled with 800 t of pure mineral oil (CH2) • (Fiducial volume: 450 t) • - 1280 inner phototubes, • - 240 veto phototubes • Simulated with a GEANT3 Monte Carlo Teppei Katori, MIT

  23. MiniBooNE collaboration, NIM.A599(2009)28 2. MiniBooNE detector • The MiniBooNE Detector • - 541 meters downstream of target • - 3 meter overburden • - 12 meter diameter sphere • (10 meter “fiducial” volume) • - Filled with 800 t of pure mineral oil (CH2) • (Fiducial volume: 450 t) • - 1280 inner phototubes, • - 240 veto phototubes • Simulated with a GEANT3 Monte Carlo Teppei Katori, MIT

  24. MiniBooNE collaboration, NIM.A599(2009)28 2. MiniBooNE detector • The MiniBooNE Detector • - 541 meters downstream of target • - 3 meter overburden • - 12 meter diameter sphere • (10 meter “fiducial” volume) • - Filled with 800 t of pure mineral oil (CH2) • (Fiducial volume: 450 t) • - 1280 inner phototubes, • - 240 veto phototubes • Simulated with a GEANT3 Monte Carlo Teppei Katori, MIT

  25. 2. Events in the detector MiniBooNE collaboration, NIM.A599(2009)28 • Muons • Sharp, clear rings • Long, straight tracks • Electrons • Scattered rings • Multiple scattering • Radiative processes m n Teppei Katori, MIT

  26. 2. Events in the detector MiniBooNE collaboration, NIM.A599(2009)28 • Muons • Sharp, clear rings • Long, straight tracks • Electrons • Scattered rings • Multiple scattering • Radiative processes e n Teppei Katori, MIT

  27. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  28. 3. CCQE event measurement in MiniBooNE nmcharged current quasi-elastic (nmCCQE) interaction is an important channel for the neutrino oscillation physics and the most abundant (~40%) interaction type in MiniBooNE detector MiniBooNE detector (spherical Cherenkov detector) 12C n Teppei Katori, MIT

  29. 3. CCQE event measurement in MiniBooNE nmcharged current quasi-elastic (nmCCQE) interaction is an important channel for the neutrino oscillation physics and the most abundant (~40%) interaction type in MiniBooNE detector MiniBooNE detector (spherical Cherenkov detector) muon like Cherenkov light and subsequent decayed electron (Michel electron) like Cherenkov light are the signal of CCQE event Cherenkov 1 e m n-beam 12C Cherenkov 2 n p (Scintillation) Teppei Katori, MIT

  30. 3. CCQE event measurement in MiniBooNE nm CCQE interactions (n+n m+p) has characteristic two “subevent” structure from muon decay  nm + ne+ e- + p 1 2  m-+ p nm+ n muon high hits Michel electron low hits 27% efficiency 77% purity 146,070 events with 5.58E20POT Teppei Katori, MIT

  31. 3. CCQE event measurement in MiniBooNE Em m 12C n-beam cosq All kinematics are specified from 2 observables, muon energy Em and muon scattering angle qm Energy of the neutrino EnQEand 4-momentum transfer Q2QEcan be reconstructed by these 2 observables, under the assumption of CCQE interaction with bound neutron at rest (“QE assumption”) Teppei Katori, MIT

  32. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  33. 4. CC1p background constraint, introduction data-MC comparison, in 2 subevent sample (absolute scale) CCQE sample shows good agreement in shape, because we tuned relativistic Fermi gas (RFG) parameters. However absolute normalization does not agree. The background is dominated with CC1p without pion (CCQE-like). We need a background prediction with an absolute scale.  nm + ne+ e- + p 1 1 2 2 CCQE nm+ n CC1p nm+ N MiniBooNE collaboration, PRL100(2008)032301  m-+ p  m-+ p+ + N (p-absorption)  nm +ne+ e- + N Teppei Katori, MIT

  34. 4. CC1p background constraint, introduction data-MC comparison, in 3 subevent sample (absolute scale) CCQE-CC1p simultaneous measurement is performed. nm + ne + e+ + N  nm +ne+ e-+ N 1 3 2 CC1p nm+ N  m-+ p+ + N nm + m+ Teppei Katori, MIT

  35. 4. CC1p background constraint data-MC comparison, before CC1p constraint (absolute scale) CCQE-CC1p simultaneous measurement is performed. We use data-MC Q2 ratio in CC1p sample to correct all CC1p events in MC. Then, this “new” MC is used to predicts CC1p background in CCQE sample This correction gives both CC1p background normalization and shape in CCQE sample Teppei Katori, MIT

  36. 4. CC1p background constraint data-MC comparison, after CC1p constraint (absolute scale) Now we have an absolute prediction of CC1p background in CCQE sample. We are ready to measure the absolute CCQE cross section! Precise background prediction is essential for precise cross section measurement Teppei Katori, MIT

  37. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  38. 5. Relativistic Fermi Gas (RFG) model Smith and Moniz, Nucl.,Phys.,B43(1972)605 Relativistic Fermi Gas (RFG) Model Carbon is described by the collection of incoherent Fermi gas particles. All details come from hadronic tensor. We tuned following 2 parameters using Q2 distribution by least c2 fit; MA = effective axial mass k= Pauli blocking parameter Teppei Katori, MIT

  39. 5. MAeff-k shape-only fit • goes down and MA goes up from previous study, due to the shape change of the background. Now k is consistent with 1. • MAeff - k shape-only fit result • MAeff = 1.35 ± 0.17 GeV (stat+sys) • = 1.007 ± 0.12 (stat+sys) • c2/ndf = 47.0/38 Q2 fits to MBnmCCQE data using the nuclear parameters: MAeff - effective axial mass k- Pauli Blocking parameter Relativistic Fermi Gas Model with tuned parameters describes nmCCQE data well Q2 distribution before and after fitting Teppei Katori, MIT

  40. 5. MAeff-k shape-only fit Caution! This new CCQE model doesn’t affect our cross section result • MAeff - kshape-only fit result • MAeff= 1.35 ± 0.17 GeV (stat+sys) • = 1.007 ± 0.12 (stat+sys) • c2/ndf = 47.0/38 Data-MC agreement in Tm-cosq kinematic plane is good. World averaged RFG model MAeff = 1.03, k = 1.000 data-MC ratio in Tm-cosq kinematic plane after fit Teppei Katori, MIT

  41. 5. Tm-cosqm plane MiniBooNE collaboration, PRL100(2008)032301 Without knowing flux perfectly, we cannot modify cross section model Data-MC ratio for Tm-cosqm plane, before tuning Teppei Katori, MIT

  42. 5. Tm-cosqm plane MiniBooNE collaboration, PRL100(2008)032301 Without knowing flux perfectly, we cannot modify cross section model Data-MC mismatching follows Q2 lines, not En lines, therefore we can see the problem is not the flux prediction, but the cross section model Data-MC ratio for Tm-cosqm plane, before tuning Teppei Katori, MIT

  43. 5. Tm-cosqm plane MiniBooNE collaboration, PRL100(2008)032301 Without knowing flux perfectly, we cannot modify cross section model Data-MC mismatching follows Q2 lines, not En lines, therefore we can see the problem is not the flux prediction, but the cross section model Data-MC ratio for Tm-cosqm plane, before tuning Data-MC ratio for Tm-cosqm plane,after tuning Teppei Katori, MIT

  44. 1. Booster neutrino beamline 2. MiniBooNE detector 3. CCQE events in MiniBooNE 4. CC1p background constraint 5. CCQE MAeff-k shape-only fit 6. CCQE absolute cross section 7 Conclusion Teppei Katori, MIT

  45. 6. CCQE absolute cross section Flux-integrated single differential cross section (Q2QE) The data is compared with various RFG model with neutrino flux averaged. Compared to the world averaged CCQE model (red), our CCQE data is 30% high. Our model extracted from shape-only fit has better agreement with (within our total normalization error). Teppei Katori, MIT

  46. 6. CCQE-like absolute cross section Flux-integrated single differential cross section (Q2QE) Irreducible background distribution is overlaid. Sum of CCQE cross section and irreducible background makes cross section of CCQE-like sample. Teppei Katori, MIT

  47. 6. CCQE absolute cross section Flux-unfolded total cross section (EnQE,RFG) New CCQE model is tuned from shape-only fitin Q2, and it also describes normalizationwell. Teppei Katori, MIT

  48. 6. CCQE errors Error summary (systematic error dominant) Flux error dominates the total normalization error. Cross section error is small because of high purity and in situ background measurement. Detector error dominates shape error, because this is related with energy scale. Unfolding error is the systematic error associated to unfolding (iterative Bayesian method). 4.60% 8.66% 4.32% 0.60% total 10.7% Teppei Katori, MIT

  49. 6. QE cross section comparison with NOMAD NOMAD collaboration, Eur.Phys.J.C63(2009)355 Flux-unfolded total cross section (EnQE,RFG) New CCQE model is tuned from shape-only fit in Q2, and it also describesnormalizationwell. Comparing with NOMAD, MiniBooNE cross section is 30% higher, but these 2 experiments leave a gap in energy to allow some interesting physics. Teppei Katori, MIT

  50. 6. CCQE total cross section model dependence NOMAD collaboration, Eur.Phys.J.C63(2009)355 Flux-unfolded total cross section (EnQE,RFG) Unfortunately, flux-unfolded cross section is model dependent. Reconstruction bias due to “QE” assumption is corrected under “RFG” model assumption. One should be careful when comparing flux-unfolded data from different experiments. Teppei Katori, MIT

More Related