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Results from Miniboone and Sciboone Results from MiniBooNE and SciBooNE Users Meeting 2010 Joseph Walding College of William and Mary 2nd June 2010 Outline Joseph Walding Fermilab Users Meeting 2nd June 2010 ● MiniBooNE and SciBooNE Refresher Course ● Physics Results From The Last Year... – Neutrino Cross-sections – Neutrino Oscillations ● Summary 2 MiniBooNE Collaboration Joseph Walding Fermilab Users Meeting 2nd June 2010 ● University of Alabama ● Saint Mary's University of Minnesota ● Bucknell University ● Virginia Tech. ● University of Cincinnati ● Western Illinois University ● University of Colorado, Boulder ● Yale University ● Columbia University ● Embry-Riddle Aeronautical University ● Fermi National Accelerator Laboratory ● University of Florida ● University of Illinois ● Indiana University ● Los Alamos National Laboratory ● Louisiana State University ● MIT ● University of Michigan 3 ● Princeton University SciBooNE Collaboration Users Meeting 2010 ● Universitat Autonoma de Barcelona ● Purdue University Calumet ● University of Cincinnati ● Universita degli Studi di Roma "La Sapienza" & INFN ● University of Colorado, Boulder ● Saint Mary's University of Minnesota ● Columbia University ● Tokyo Institute of Technology ● Fermi National Accelerator Laboratory ● Unversitat de Valencia ● High Energy Accelerator Research Organization (KEK) ● Imperial College London A selection of SciBooNE collaborators at the ● Indiana University London Collaboration Meeting. March 2008 ● Institute for Cosmic Ray Research (ICRR) ● Kyoto University ● Kamioka Observatory ● Los Alamos National Laboratory ● Louisiana State University ● MIT 4 Outline Joseph Walding Fermilab Users Meeting 2nd June 2010 ● MiniBooNE and SciBooNE Refresher Course ● Physics Results From The Last Year... – Neutrino Cross-sections – Neutrino Oscillations ● Summary 5 The Booster n Experiments Joseph Walding Fermilab Users Meeting 2nd June 2010 50 m 440 m SciBooNE MiniBooNE ● Booster Proton accelerator: 8 GeV protons sent to target ● Target Hall: Beryllium target. 174kA magnetic horn with reversible horn polarity ● 50m decay volume: Mesons decay to m & n . Short decay pipe minimises m®ne decay m 6 ● SciBooNE: 100m baseline; MiniBooNE: 540m baseline Neutrino Beam Joseph Walding Fermilab Users Meeting 2nd June 2010 ● Use HARP experiment pBe®p± production data to predict our neutrino flux – ● Kaon production: Primary source of ne's ● Reversible horn polarity used to sign select mesons – Run in neutrino or anti-neutrino mode MiniBooNE Neutrino-Mode Flux MiniBooNE Antineutrino-Mode Flux ν ν µ ν µ µ ν µ ν ν e e ν e ν e 7 Wrong sign flux: ~6% Wrong sign flux: ~18% Intrinsic ne flux: ~0.5% Intrinsic ne flux: ~0.5% SciBooNE Joseph Walding Fermilab Users Meeting 2nd June 2010 SciBar Electron-Catcher (EC) 14,336 Scintillator bars 'Spaghetti' Calorimeter 15 tons (10 tons F.V.) 2 planes (x&y) 11X p/p separation using dE/dx 0 0 identify p & ne Muon Range Detector (MRD) 12 2” iron planes 362 scintillator panels stop m's with p < 1.2 GeV/c n beam All detectors have X&Y views SciBar & EC used at K2K 4m MRD 'new' detector built at FNAL 2008 DOE P2* Environmental Award 2m 8 MiniBooNE Joseph Walding Fermilab Users Meeting 2nd June 2010 Cherenkov Detector Specification Events identified using: 12 m diameter tank Ring topology 900 tons mineral oil (CH2) m-decay Michel signal 1280 inner PMTs (signal region) Scintillation light 240 outer PMTs (veto region) Able to distinguish nm from ne Physics Goals: Principally a neutrino oscillation experiment. Also able to measure neutrino cross-sections 9 Huge data-set in neutrino and antineutrino mode Data Sets Joseph Walding Fermilab Users Meeting 2nd June 2010 MiniBooNE SciBooNE ) 30 T O P mode 6 1 E 4 / ( n mode 20 _ e t a n _ r t mode n n e mode v E 10 mode mode 0 J un J ul Oct Nov Dec J an Feb Mar Apr May J un J ul Aug '07 '08 Date 0 1 ● 20 2n: 0.99x10 POT _ ● n: 1.53x1020 POT ● n: 6.5x1020 POT _ ● 95% POT efficiency ● n: 5.8x1020 POT _ Thank you to the Beams Division! ● Currently running in n mode 10 – Approved for 1x1021 POT Outline Joseph Walding Fermilab Users Meeting 2nd June 2010 ● MiniBooNE and SciBooNE Refresher Course ● Physics Results From The Last Year... – Neutrino Cross-sections – Neutrino Oscillations ● Summary 11 Neutrino Cross-Sections Joseph Walding Fermilab Users Meeting 2nd June 2010 _ ● Previous measurements from ● No measurements of sub-GeV n 1970's-1980's cross-sections ● Mostly H2 & D2 targets ● Important for CP studies _ ● Small sample sizes (100's of events) ● n and : n Different oscillation probabilities _ n CC cross-section G. Zeller n CC cross-section G. Zeller T2K NOvA T2K NOvA 12 LBNE LBNE Neutrino Cross-Sections Joseph Walding Fermilab Users Meeting 2nd June 2010 Good understanding of high E cross-sections (DIS) Low E is different regime: Quasi-elastic (QE) and single pion (1p) events dominate Important for future neutrino oscillation experiments _ n CC cross-section G. Zeller n CC cross-section G. Zeller T2K NOvA T2K NOvA 13 LBNE LBNE Neutrino Cross-Sections Joseph Walding Fermilab Users Meeting 2nd June 2010 Expected statistic error (T2K) K. Hiraide 5% systematic 20% systematic Wish to know T2K cross-sections better than 10% n CC cross-section G. Zeller quasi-elastic (QE) signal NC π 0 (background to ν e appearance) CC π + T2K NOvA (background to 14 ν disappearance) LBNE µ Quasi-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 'Typical' muon ring in MiniBooNE - nm m CCQE W+ n p ● MiniBooNE uses muon kinematics to describe event ● Identify muons from decay signature ● Measuring total and differential cross- sections – Not ratios with respect to Charged 15 Current inclusive events Quasi-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 eff 2 MA = 1.35 ± 0.17 GeV/c cf. K2K: MA = 1.20 ± 0.12 (SciFi) MA = 1.14 ± 0.11 (SciBar) ● Very different from light target experiments and for higher energy interactions ● First double differential CCQE cross-section – Model Independent 146,070 events: 77.0% purity, 26.6% efficiency J.Phys. G28 , R1 (2002) , R1 16 T. Katori: arXiv:1002.2680, accepted by PRD Quasi-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 'Typical' 2-track CCQE event in SciBooNE - nm m CCQE W+ m n p p ● SciBooNE uses muon and proton kinematics to describe event ● Identify muons using MRD or from decay signature 17 Quasi-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 ● Extraction of CCQE absolute cross-section J. Alcaraz – MRD-matched sample MRD-Matched Sample: 13,585 1-track events: 66.2% purity, 10.8% efficiency 2,915 2-track events: 68.5% purity, 2.3% efficiency Preliminary SciBar-Contained SciBar-Contained 1-track sample 2-track sample ● SciBar-contained 1-track (m) sample: Excess in backwards muon tracks ● Not seen in 2-track (m+p) sample 18 J. Walding: Thesis Quasi-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 ● SciBooNE and MiniBooNE data in good agreement ● Low to high energy discrepancy – Minerva to fill in the gaps... Minerva, MINOS Preliminary 19 NC-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 n n m m ● Neutral Current – NCE Z0 SciBooNE: Proton track – MiniBooNE: Scintillation light ● Proton typically below n,p n,p Cherenkov threshold ● SciBooNE: – NC/CCQE ratio calculation in progress – watch this space! 20 NC-Elastic Scattering Joseph Walding Fermilab Users Meeting 2nd June 2010 d ● Extracted dQ2 ● MiniBooNE CCQE value for MA better description of data than world average ● Isolating a Cherenkov proton sample – Ratio: p p / N N Preliminary – Strange spin component of the nucleon, Ds ● Ds= 0.08±0.26, systematics limited D. Perevalov: arXiv D. 0909.4617Perevalov: Preliminary Preliminary 21 NC p 0 Production Joseph Walding Fermilab Users Meeting 2nd June 2010 nm nm Z0 p0 n,p n,p ● SciBooNE: Two measurements – Inclusive NC p0 – Coherent NC p0 22 Inclusive NC p 0 Production Joseph Walding Fermilab Users Meeting 2nd June 2010 ● Charged current events rejected by looking for muon decay signature ● Vertex reconstruction used to reject external neutrino events (dirt events) from sample ● Able to reconstruct the p0 mass ● Extract_ model independent cross-section ratio (En = 0.8 GeV): 657 events selected, 240 expected background events 0 0 0 NC NC NC N obs −N bck CC = CC CC CC − 0 N obs N bck NC Y. Kurimoto: Phys. Rev. D81, 033004 Kurimoto: Phys. Rev. Y. =7.7±0.5stat±0.5sys×10−2 cf. MC prediction = 6.8x10-2 23 Error < 10% Coherent NC p 0 Production Joseph Walding Fermilab Users Meeting 2nd June 2010 ν Without vertex activity µ ν µ π0 ● Neutrino interacts coherently with whole nucleus – No nucleon recoil, forward tracks only – SciBar sensitive to proton recoil ● Not possible in MiniBooNE With vertex activity ● Define region around reconstructed vertex to look for proton recoil activity ● Extract model-dependent coherent fraction ● Fraction of NC π0 events from coherent channel: 17.9% (cf. MiniBooNE: 19.5%) – Agrees with Rein-Sehgal (RS) prediction – CC (K2K, SciBooNE): No evidence of coherent 24 production - disagrees with RS prediction by PRD accepted Kurimoto: arXiv 1005.0059, Y. MB: NC p0 Production Joseph Walding Fermilab Users Meeting 2nd June 2010 nm nm Z0 p0 n,p n,p ● Cross-section extraction in neutrino and antineutrino mode 25 MB: NC p0 Production Joseph Walding Fermilab Users Meeting 2nd June 2010 ● More model-independent measurements _ ● Flux averaged differential cross-sections (n and n mode) – Already being used by T2K! 26 C. Anderson: Phys. Rev. D81, 013005 CC p Production Joseph Walding Fermilab Users Meeting 2nd June 2010 n m- m ● + CC-p : Background to nm disappearance – If pion not identified event looks W+ CCQE-like p – Mis-reconstruction of neutrino energy n,p n,p ● For T2K need to know CC-p+ cross- section to <10% ● CC-p0: Not an oscillation background – Completes p production picture 27 MB: CC p + Production Joseph Walding Fermilab Users Meeting 2nd June 2010 ● Ability to separate pion and muon tracks Kink point – Hadronic interactions ® kinked tracks ● Absolute and multiple differential cross-sections calculated: Model ∂ ∂ ∂ ∂ ∂2 ∂2 Independent , , , , , ∂KE ∂cos ∂KE ∂ cos ∂ KE ∂cos ∂KE∂cos Model ∂ E , dependent ∂Q2 Preliminary Preliminary M.
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