1. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. The Neutrino Flux At MiniBooNE.

2. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 2 The BooNE Collaboration Y. Liu, I. Stancu University of Alabama, Tuscaloosa, AL 35487 S. Koutsoliotas Bucknell University, Lewisburg, PA 17837 E. Hawker, R. A. Johnson, J. L. Raaf University of Cincinnati, Cincinnati, OH 45221 T. Hart, R. H. Nelson, E. D. Zimmerman University of Colorado, Boulder, CO 80309 A. A. Aguilar-Arevalo, L. Bugel, J. M. Conrad, J. Formaggio, J. Link, J. Monroe, D. Schmitz, M. H. Shaevitz, M. Sorel, G. P. Zeller Columbia University, Nevis Labs, Irvington, NY 10533 D. Smith Embry Riddle Aeronautical University, Prescott, AZ 86301 L. Bartoszek, C. Bhat, S. J. Brice, B. C. Brown, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, P. Kasper, T. Kobilarcik, I. Kourbanis, A. Malensek, W. Marsh, P. Martin, F. Mills, C. Moore, P. Nienaber, E. Prebys, A. D. Russell, P. Spentzouris, R. Stefanski, T. Williams Fermi National Accelerator Laboratory, Batavia, IL 60510 D. Cox, A. Green, H. Meyer, R. Tayloe Indiana University, Bloomington, IN 47405 G. T. Garvey, C. Green, W. C. Louis, G. A. McGregor, S. McKenney, G. B. Mills, V. Sandberg, B. Sapp, R. Schirato, N. Walbridge, R. Van de Water, D. H. White Los Alamos National Laboratory, Los Alamos, NM 87545 R. Imlay, W. Metcalf, M. Sung, M. O. Wascko Louisiana State University, Baton Rouge, LA 70803 J. Cao, Y. Liu, B. P. Roe University of Michigan, Ann Arbor, MI 48109 A. O. Bazarko, P. D. Meyers, R. B. Patterson, F. C. Shoemaker, H. A. Tanaka Princeton University, Princeton, NJ 08544

3. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 3 MiniBooNE Overview 8GeV Booster ? magnetic horn and target decay pipe 25 or 50 m LMC 450 m dirt detector absorber   e K+K+ ++  ++ The FNAL Booster delivers 8 GeV protons to the MiniBooNE beamline. The protons hit a beryllium target producing pions and kaons. The magnetic horn focuses the secondary particles towards the detector. The mesons decay, and the neutrinos fly to the detector.  Signal from  +   +  …then…   e …which produces… e - in the detector.

4. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 4 Meson Production in the Target Sanford-Wang parameterizations (pions): Cho Fit. K2K Fit. JAM Fit (MiniBooNE internal). MARS Monte Carlo (pions and kaons † ). GFLUKA Monte Carlo (pions and kaons). † MARS does not store neutral kaons and so these are constructed from K + using the GFLUKA K 0 L /K + yield ratio.

5. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 5 Sanford-Wang Parameterization Empirical parameterization with 8 free parameters: where: P π is the momentum of the pion. P p is the momentum of the proton. Θ π is the production angle of the pion in the lab frame. c 1-8 are the parameters determined by fitting to available data.

6. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 6 Detector Pion Acceptance MARS production model used. momentum angle

7. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 7 S-W Fit Results MiniBooNE fit ( Jocelyn Monroe, Columbia University) used the following data: Vorontsov,1983. Cho, 1971. Marmer, 1969. Dekkers, 1964 (subset).

8. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 8 Vorontsov 1983.

9. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 9 Cho 1971.

10. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 10 Marmer 1969.

11. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 11 Dekkers 1964.

12. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 12 Beamline Modeling GEANT 4 Monte Carlo used for beam simulations. Meson productions models from external sources (MARS, GFLUKA, S-W etc.) are implemented within G4. GEANT 4 implementation principally by Michel Sorel, Columbia University. Neutrino flux which intersects the detector is boosted by redecaying mesons.

13. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 13 GEANT 4 Geometry

14. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 14

15. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 15

16. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 16

17. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 17

18. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 18

19. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 19 Horn Field Simulation Horn provides a ×7 increase in the flux and it is therefore necessary to check the motion of charged particles in its magnetic field. Horn field was mapped during testing: 300 positions between inner and outer conductor were mapped. G4 results have been checked, and agree, with a standalone calculation based on the CERNLIB routine DRKNYS (numerical integration routine).

20. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 20

21. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 21

22. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 22 G4 Neutrino Flux Predictions JAM CHO MARS GFLUKA

23. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 23 E910 Data Data taken on Au, Cu, Pb, U and Be. Be data taken at momenta of 17.5, 12.3 and 6.4GeV. About 1M events at 12.3GeV. Unfortunately only about 5k events at 6.4GeV. Currently analyzing 12.3 and 6.4GeV data. Initial Sanford-Wang parameterization results look encouraging.

24. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 24 HARP (PS214) Data Secondary particle production from 8 GeV protons on an actual MiniBooNE target has been measured at HARP. Over 5 million interactions have been recorded. Analysis of data has started.

25. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 25 Detector Response NUANCE Monte Carlo used to model particle production in the MiniBooNE detector. BooDetMC used to simulate detector response (GEANT 3 based). Uncertainties associated with each of these.

26. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 26 Abundance ~40%. Simple topology. Kinematics give E ν and Q 2 from E μ and Θ μ. CC ν μ Quasi-elastic data

27. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 27 Yellow band: Monte Carlo with current uncertainties from flux prediction. σ CCQE optical properties. CC ν μ Quasi-elastic preliminary Selection based on PMT hit topology and timing. Variables combined in a Fisher discriminant, yielding ~88% purity in remaining dataset. Data and MC relatively normalized.

28. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 28 800 MeV CC ν μ Quasi-elastic preliminary CC ν μ energy resolution. Monte Carlo a = 3.79×10 -2 b = 8.36×10 -2

29. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 29 Resistive Wall Monitor DAQ PC GPS Waveform Analyser RWM MI12 MiniBooNE Detector short Discriminator Detector Electronics Amplifier hi Z

30. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 30 Utilizing RWM Timing The goal is to combine the RWM bunch timing with the reconstructed event time in the detector to identify different classes of events. target interaction point proton meson neutrino decay Given that: all mesons do not travel at the same speed. prompt detection of interaction does not always occur. The timing distributions of events with respect to the beam may vary for different event samples. Intrinsic smearing and resolutions may be a problem to achieve powerful discrimination.

31. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 31 The RF Bucket Structure t 1 and t 2 are the midpoints to adjacent buckets. unofficial

32. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 32 Muon Sample Example unofficial event time, wrt nearest bunch peak / ns

33. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 33 Conclusions Lots of work ongoing on the neutrino beam simulation. Shape agreement between data and MC is reasonable. E910 and especially HARP data should provide an accurate description of target meson production.

34. Gordon McGregor Saturday, November 8, 2003. NBI03, Tsukuba, Japan. 34 8 GeV protons on Be target gives: p + Be   +, K +, K 0  from:  +   +  K +   +  K 0   -  +  e from:  +  e + e  K +   0 e + e K 0   - e + e L L L Flux at the Detector preliminary Pion contribution from JAM S-W parameterization. MARS/GFLUKA for kaon contribution.