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Measuring Oscillation Parameters: Hadron Production Models Comparison

This study compares four different hadron production models by analyzing predicted far neutrino muon charged current spectra. Using MC and data samples, parameters are measured via energy spectrum analysis at the Far Detector. Results show confidence limits on best-fit parameters for the models.

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Measuring Oscillation Parameters: Hadron Production Models Comparison

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  1. Measuring Oscillation Parameters • Four different Hadron Production models  Four predicted Far nm CC spectrum

  2. Measuring Oscillation Parameters • 25,000 MC n events for LE beam, ~18,500 CC • Split sample into small “DATA” sample (~2 years) and large “MC” sample (~5 years) • Using DATA truth info: • Reweight according to a hadron production model • Reweight with oscillation prob (Dm2=0.0025, sin22q=1) • Smear muon energy (6% stopping, 15% exiting) • Using MC truth info: • Carry out same procedure for a range of oscillation parameters • Calculate and compare Chi-Squared with DATA

  3. Measuring Oscillation Parameters • Attempt to measure parameters using only muon energy spectrum at Far Detector • Better energy resolution • Independent of energy calibration • Reject Em<0.6 GeV to reduce NC background • Reject events with Eshw>20 GeV since n does not contribute to oscillation signal

  4. Measuring Oscillation Parameters • After 2 years, 68.3% confidence limits on MC best fit for the four hadron production models: • Using all muons: measure Dm2 to ~20% , sin22q to ~18% • Contained muons: measure Dm2 to ~22% , sin22q to ~20% (“worst case” errors from models)

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