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Current Status of the MiniBooNE Neutral Current  0 Analysis

Explore the current measurements, event selection process, reconstructed mass peak, and kinematic variables in the MiniBooNE neutrino current π0 analysis, with insights on crucial measurements and future endeavors. Contact Heather Ray at hray@fnal.gov for more information.

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Current Status of the MiniBooNE Neutral Current  0 Analysis

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  1. Current Status of the MiniBooNE Neutral Current 0 Analysis Heather Ray hray@fnal.gov Los Alamos National Lab

  2. Outline • Current world measurements • Event selection • Reconstructed mass peak • Kinematic variables • Future Plans H. Ray

  3. Current Measurements • Oneabsolute measurement : Gargamelle Cross section for  - p Cross section for  - n Hawker, Morfin, and Pohl : NuInt ‘02 H. Ray

  4. Current Measurements • Rest of measurements exist as NC/CC  ratios • (bubble, spark chambers) NC  / CC  = 0.064  0.001(stat)  0.007(syst) K2K, hep-ex/0408134 R0 = (0/ )data = 1.03  0.02(stat)  0.09(syst) (0/  )MC C. Mauger for K2K, Nucl.Proc.Suppl. 112 (2002) H. Ray

  5. Why Measure 0 Cross Sections? • MiniBooNE : dominant mis-id background for e appearance oscillation analysis • NC0  used to limit the sterile neutrino component present in atmospheric oscillations • crucial for distinguishing  from s • + angular distribution constrains mechanisms for NC 0 production H. Ray

  6. Event Selection candidate • Identify events using hit topology • Minimum tank hits, maximum veto hits, no decay electrons, 2 Cerenkov rings > 40 MeV each, opening angle cut, minimum allowed reconstructed mass • signal yield extracted from fit with bgd MC : fit assuming 2 rings • Collected ~2x1020 pot for this analysis ecandidate 0 candidate H. Ray

  7. NC 0 Candidate Events • Mass peak : 55% sample purity with 42% efficiency • Signal from NC resonant and coherent production • Resonant •  + (p/n)   +    (p/n)+ 0 • Background to e appearance • Coherent •  + C  + C + 0 • Background from all other events (some multi- and non-NC final state 0 expected) H. Ray

  8. NC 0 Kinematic Distributions Errors are shape errors Dark grey : flux errors Light grey : representative oil optical model variation bands • Fit to mass peak to extract signal yields in each kinematic bin • high purity! • Angular distribution of production as a function of reconstructed 0 direction relative to beam direction (Cos 0) • sensitive to production mechanism (coherent = forward, resonant = not so forward) H. Ray

  9. NC 0 Kinematic Distributions • 0 momentum = good data/mc agreement • Falloff at high momentum due to flux (less 0 at high momentum) • Cosine of COM angle • Important for appearance search : CCQE e has large values H. Ray

  10. Summary • Lack of cross section measurements in MiniBooNE energy range • On the way to analyzing the coherent contribution to production • Next step : NC 0 cross section! H. Ray

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