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MiniBooNE: Current Status.

MiniBooNE: Current Status. 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

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MiniBooNE: Current Status.

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  1. MiniBooNE: Current Status. DOE Annual Program Review, FNAL.

  2. 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, T. Katori, 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, H. Ray, V. Sandberg, B. Sapp, R. Schirato, R. Van de Water, N. Walbridge, D. H. White Los Alamos National Laboratory, Los Alamos, NM 87545 R. Imlay, W. Metcalf, S. Ouedraogo, M. Sung, M. O. Wascko Louisiana State University, Baton Rouge, LA 70803 J. Cao, Y. Liu, B. P. Roe, H. Yang 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 The BooNE Collaboration - 10 universities and 2 national laboratories DOE Annual Program Review, FNAL.

  3. νμ→νe oscillations at ~4σ The LSND Result: Signal above background: 87.9±22.4±6.0 events Oscillation probability: (0.264±0.067±0.045)% DOE Annual Program Review, FNAL.

  4. Why MiniBooNE? • Results from the LSND experiment and solar and atmospheric neutrino experiments can be explained by neutrino oscillations with distinct values of Δm2. • The Standard Model, with only 3 neutrino flavors, cannot accommodate all the Δm2 values. • Either one or more of the results is not due to oscillations, or there is physics beyond the Standard Model. DOE Annual Program Review, FNAL.

  5. LMC ? m+ K+ νμ→νe 8GeV p+ nm Booster magnetic horn decay pipe 450 m dirt detector absorber and target 25 or 50 m Introducing MiniBooNE: The Booster Neutrino Experiment • Different systematics: beam energy ×10 LSND (same L/E), event signatures and backgrounds different. • Anticipate >4σ significance over entire LSND 90% CL region with 1×1021 protons on target. • The goal: to confirm, or exclude, the LSND result. DOE Annual Program Review, FNAL.

  6. Protons Delivered http://www-boone.fnal.gov/publicpages/progress_monitor.html DOE Annual Program Review, FNAL.

  7. Linac & Booster Improvements New Lambertson Notching in Linac 4 Large Aperture Magnets in MI8 line Collimator System and… LCW upgrade, vacuum upgrade, profile monitor, beam whacker, hose replacement, better survey… New Damper MP01 Supply Dog-Leg Extension Larger RF Cavities Booster Monitoring Radworker Robot DOE Annual Program Review, FNAL.

  8. Linac & Booster Improvements Improvements from the collimator system should be realized very soon as the FNAL AD Rapid Response Team has been assigned to commission it. DOE Annual Program Review, FNAL.

  9. preliminary GFLUKA prediction (no error shown) region where JAM extrapolates Size of JAM error at our Pbeam Pion Production in the Target Y. Cho et al., Phys. Rev. D4, 1967 (1971) • E910 data not used in JAM fit, but good agreement. Combined fit coming soon. • HARP experiment will ultimately address meson production at 8 GeV. DOE Annual Program Review, FNAL.

  10. LMC Update • LMC detects muons at high pt from kaon decay. • Detector installed during fall shutdown 2003. • DAQ fully functional with the LMC datastream integrated into the full MiniBooNE datastream. • Commissioning of the full LMC detector is underway. • Analysis software and Monte Carlo are being written. DOE Annual Program Review, FNAL.

  11. 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. DOE Annual Program Review, FNAL.

  12. Cross Sections • The NUANCE MC, written by Dave Casper (UC Irvine), is used to generate neutrino interactions in the oil. • The MiniBooNE cross section group is rigorously cross checking this code. • Recently, the 1st comparisons of NUANCE (v2 and v3), NEUGEN, and NEUT have been made for the MiniBooNE beam. Not a large amount of data in our region. MiniBooNE (with ~550k events by 2005) will make a significant contribution to CCQE cross section data. DOE Annual Program Review, FNAL.

  13. The MiniBooNE Detector • 12 m diameter detector. • 250,000 gallons of mineral oil. • Optically isolated inner region with 1280 8" PMTs, giving 10% coverage. • Outer veto region of 240 8"PMTs. DOE Annual Program Review, FNAL.

  14. preliminary Understanding the Optics Fluorescence (FS) Wavelength / nm Measurements showing fluorescence spectra made by Anna Pla-Dalmau at the MINOS scintillator test facility, FNAL. DOE Annual Program Review, FNAL.

  15. preliminary Energy Reconstruction DOE Annual Program Review, FNAL.

  16. Neutrino Events - the world’s best short baseline ν beam • Beam comes in 1.6 μsec spills at up to 5 Hz. • Detector triggered on signal from the accelerator complex. 19.2 μsec of activity read out. • No high level analysis needed to see neutrino events. Backgrounds from cosmic ray muons and subsequent decay electrons. • 240k neutrino candidates in 2.2 x 1020 protons on target. DOE Annual Program Review, FNAL.

  17. Michel e candidate MiniBooNE Particle ID Beam μ candidate Beam π0 candidate DOE Annual Program Review, FNAL.

  18. resonant: coherent: Z p/n p/n Early Data NC π0 Production CC Quasi-elastic NC Elastic Scattering • Simple topology. • Kinematics give Eν and Q2 from Eμ and Θμ. • νμ disappearance analysis. • π0→γγ. • Reconstruct invariant mass of the two photons. • Background to the νe appearance analysis. • Usually sub-Čerenkov, dominated by scintillation light. • Low tank PMT multiplicity. DOE Annual Program Review, FNAL.

  19. preliminary Yellow band: Monte Carlo with current uncertainties from These uncertainties will improve. • flux prediction. • σCCQE • optical properties. CC νμ Quasi-elastic Selection based on PMT hit topology and timing. ~88% purity in remaining dataset. Data and MC relatively normalized. DOE Annual Program Review, FNAL.

  20. preliminary Monte Carlo CC νμ Quasi-elastic CC νμ energy resolution. a = 3.79×10-2 b = 8.36×10-2 <10% for Eν>800 MeV DOE Annual Program Review, FNAL.

  21. preliminary NC π0 Production • NTANK>200, NVETO<6, no decay electron. • Perform two ring fit on all events. • Require ring energies E1, E2 > 40 MeV. • Fit mass peak to extract signal yield and background (shape from Monte Carlo). DOE Annual Program Review, FNAL.

  22. preliminary NC π0 Production Sensitive to production mechanism. Coherent is highly forward peaked. Data and MC are relatively normalized. MC shape assumes Rein-Sehgal cross sections. DOE Annual Program Review, FNAL.

  23. preliminary CM frame lab frame small γ γ opening angle ΘCM = π/2 a cosΘCM= 0 ΘCM = 0 photon energies asymmetric a cosΘCM= 1 NC π0 Production DOE Annual Program Review, FNAL.

  24. preliminary Select NTANK < 150 and NVETO< 6. Background subtraction required. NC Elastic Scattering DOE Annual Program Review, FNAL.

  25. preliminary NC Elastic Scattering DOE Annual Program Review, FNAL.

  26. 1×1021 pot SignalMis IDIntrinsic νe Estimates of νμ  νe Appearance • Look for appearance of νe events above background expectation. • Fit to Eν distribution used to separate background from signal. DOE Annual Program Review, FNAL.

  27. 1×1021 pot Δm2 = 1 eV2 Δm2 = 0.4 eV2 MiniBooNE Oscillation Sensitivity - systematic errors on backgrounds average ~5% 1.6σ 3σ 5σ 2σ 1σ DOE Annual Program Review, FNAL.

  28. Future Possibilities • Statistics limited until about 2×1021 protons on target. • Antineutrino running provides the ability to check for CP and CPT violation, and gives important systematic cross checks. (LSND signal was νμ→νe). • Running with 25m absorber would also give important systematic cross checks. • If a signal is seen, a second detector would be built and the current detector upgraded, enabling a high precision measurement of the mixing parameters. DOE Annual Program Review, FNAL.

  29. Conclusions • MiniBooNE is running well. • Analyses are progressing steadily. • 1×1021 protons should be enough for MiniBooNE to achieve its neutrino goals. • Results mid 2005. A decisive result from MiniBooNE, either confirming or excluding the LSND result, would be a huge success for Fermilab.If oscillations are seen, important new physics beyond the Standard Model will have been confirmed. DOE Annual Program Review, FNAL.

  30. Not Enough Protons? - only 5 ×1020 pot could leave questions open… 5σ 3σ 1.6σ DOE Annual Program Review, FNAL.

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