1 / 24

Mini Overview Peter Kasper NBI 2002

Mini Overview Peter Kasper NBI 2002. The MiniBooNE Collaboration. University of Alabama, Tuscaloosa Bucknell University, Lewisburg University of California, Riverside University of Cincinnati, Cincinnati University of Colorado, Boulder Columbia University, Nevis Labs, Irvington

sukey
Download Presentation

Mini Overview Peter Kasper NBI 2002

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. Mini OverviewPeter KasperNBI 2002

  2. The MiniBooNE Collaboration University of Alabama, Tuscaloosa Bucknell University, Lewisburg University of California, Riverside University of Cincinnati, Cincinnati University of Colorado, Boulder Columbia University, Nevis Labs, Irvington Embry Riddle Aeronautical University Fermi National Accelerator Laboratory Indiana University, Bloomington Los Alamos National Laboratory Louisiana State University, Baton Rouge University of Michigan, Ann Arbor Princeton University, Princeton

  3. MiniBooNE Goals • MiniBooNE’sprimary goal is to unequivocally confirm or refute the LSND oscillation signal for   e • Similar L/E ~ 1 to LSND but ~10x higher energy • En ~ 0.5 - 1 GeV • L = 500 m • Experimental signatures and backgrounds are completely different from LSND • provides a truly independent test of their result. • If the signal is confirmed, a second detector will be built ... • i.e. full BooNE

  4. LSND and KARMEN Results • KARMEN limits • Solid curve calculated with the Feldman & Cousins approach • Dashed curve is experiment’s sensitivity • LSND signal region •  90% Lmax - L < 2.3 •  99% Lmax - L < 4.6

  5. The LSND Signal • Signal discrimination is encapsulated into a variable Rg • Ratio of likelihood that e+and g are correlated to likelihood that g is accidental. • 87.9 ± 22.4 ± 6.0 event excess consistent with ne p e+ n followed by np d g. • 4 times the expected rate from beamne`s signal

  6. LSND Implications • What we know from other experiments • Atmospheric nm’s oscillate at Dm2 ~ 10-3 with maximal mixing ( e.g. SuperK ) • nm nt favored • Solar ne’s oscillate at Dm2 < 10-4 ( e.g. SNO ) • nm nt/e favored • LSND results has Dm2~ 10-1 fornmne • hence require  4 neutrino mass states • Only 3 active flavors ( LEP ) • hence sterile n’s are required OR • neutrino masses  antineutrino masses

  7. An Experimentally Allowed Model • Bimaximal mixing in 3 + 1 models • W. Krolikowski HEP-PH/0106350 • R.N.Mohapatra Phys.Rev. D64 (2001) 091301, n4 Dm2 LSND ne n3 nm Dm2 Atm. nt n2 Dm2 Solar ns n1

  8. An Alternative Model • Maximal CPT violation in Dirac mass terms • Barenboim, Borissov, Lykken & Smirnov HEP-PH/0108199 • Generates independent masses for n’s andn’s • Motivated by branes with extra dimensions n3 ne nm nt Dm2 LSND n3 n2 Dm2 Atm. n2 n1 Dm2 Solar n1

  9. Proton Beam • MiniBooNE’s neutrino beam will be produced with a high intensity ( 5E12 @ 5 Hz ) 8 GeV proton beam from the Fermilab Booster. • The Booster cycles at 15 Hz and produces 1.6 msec beam pulses. New construction • Proton beam line • Target Hall • Decay pipe • Detector building

  10. Beam Layout • Civil construction for the 8 GeV Beamline, Target Hall, and Decay Pipe began in June 2000. • 50m long decay pipe

  11. Beam Line Construction • Civil Construction is complete and component installation is well advanced. Ready for beam tests this April. 24-Jan-02

  12. Target Hall Construction • Civil and target pile construction is complete. Horn installation is scheduled to start in early May. 24-Jan-02 24-Jan-02

  13. Decay Pipe Construction • Two absorbers at 25m (removable) and 50m (fixed) provide a cross check of the intrinsicnecomponent in the beam. 50m absorber with muon counters 24-Jan-02 Air heat exchanger for cooling berm 25m absorber 13-Nov-00

  14. The Target A 65cm, air cooled Be target will be inserted inside a single focussing horn 7-Feb-02 Hadroproduction studies will be done for our energy and target. (BNL910 and HARP)

  15. The Horn • A single horn system will be used ( proposal had two ) • Less flux but also less background from high energy (>1 GeV) neutrinos than the original 2 horn design • Horn has been built and tested for > 107 pulses 20-Jun-01

  16. The Neutrino Beam • Intrinsic ne contamination can be .. • Inferred fromnm events • Simulated using hadroproduction measurements • Measured using muon counters in and around the decay pipe • Checked by comparing 50m and 25m absorber results

  17. The Detector • The detector is a 40ft (12.2m) diameter sphere filled with 800 tons of pure mineral oil and instrumented with ~1500 8” PMTs. • It is housed underground in order to provide some cosmic ray shielding.

  18. The Detector (cont.) • It will consist two optically separated regions ... • An inner sphere with 1280 PMTs viewing a 445 ton fiducial volume ( 10% photocathode coverage) • An outer veto shell 35cm thick monitored by 240 PMTs.

  19. Detector Status • The detector enclosure was completed in December 2000. • The PMT installation was completed in October 2001. • Oil fill started early January and the detector is now 60% full. Detector Enclosure Jan 2001 PMT installation Sept. 2001

  20. A Possible Stopping Cosmic Ray Muon

  21. Event Reconstruction • MiniBooNE will reconstruct quasi-elastic ne interactions by identifying the characteristic Cerenkov rings produced by the electrons ...

  22. Approximate # of Events after 1-2 Years

  23. MiniBooNE Sensitivity: 2 yr’s of nm • The major backgrounds • misid m’s from CC nm • misid p0’s from NC nm • Uncertainties in these rates to be < 5% in each case. • ne‘s Intrinsic to the beam have a different energy distribution than oscillation ne‘s • Event energy can be measured using scintillation light

  24. Summary • All civil construction projects for MiniBooNE are essentially complete. • The detector instrumentation is complete and the oil fill is well under way. • MiniBooNE is on schedule for taking first data later this summer. • The biggest issue facing the experiment at this point is the Booster’s ability to deliver the required number of protons. • The limits will be due to radiation levels both in the tunnel and above ground.

More Related