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Appearance in MINOS. University of Minnesota A.P. Schreckenberger DPF 2011. Introduction. A new MINOS analysis Complementary to appearance study First-time look at this oscillation mode by MINOS Currently under development – results in not too distant future Brief recap of apperance

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appearance in minos

Appearance in MINOS

University of Minnesota

A.P. Schreckenberger

DPF 2011

introduction
Introduction
  • A new MINOS analysis
    • Complementary to appearance study
    • First-time look at this oscillation mode by MINOS
    • Currently under development – results in not too distant future
  • Brief recap of apperance
  • Motivation for analysis
  • Dataset & sensitivity estimates
appearance in minos1
Appearance in MINOS
  • 8.2e20 protons-on-target analysis
    • 90% CL below the CHOOZ limit with normal hierarchy
    • Θ13 = 0 hypothesis disfavored at 89% CL
    • Less sensitive to inverted mass hierarchy
slide4
Why
  • Greater sensitivity to inverted hierarchy
  • Δ
  • δ is CP-violating phase
slide5
Why
  • A, Δ and α flip signs in hierarchy change
  • A and δ flip signs under charge conjugation

Normal Hierarchy Inverted Hierarchy

What happens to the three terms?

slide6
Why
  • A, Δ and α flip signs in hierarchy change
  • A and δ flip signs under charge conjugation

Normal Hierarchy Inverted Hierarchy

slide7
Why
  • A, Δ and α flip signs in hierarchy change
  • A and δ flip signs under charge conjugation

Normal Hierarchy Inverted Hierarchy

slide8
Why
  • A, Δ and α flip signs in hierarchy change
  • A and δ flip signs under charge conjugation

Normal Hierarchy Inverted Hierarchy

slide9
Why
  • Appearance Probability as a function of energy
    • Generated using full probability expression
slide10
Why
  • Is there new physics to be seen?
    • Are there matter effects specific to ?
    • Access to energies beyond the scope of reactor experiments
  • Experimental motivations
    • MiniBooNE & LSND
    • MINOS: and observations
      • Consistent at 2.0% CL withidentical oscillation parameterhypothesis
h ow do we get
How do we get
  • Horns focus off-axis particles of designated charge
  • Polarity determines which charge is focused

Focusing Horns

Target

2 m

π−

νμ

νμ

π+

30 m

15 m

675 m

how do we get
How do we get
  • event rate suppressed due to decreased cross-section

Neutrino Mode vs. Antineutrino Mode spectra

νμ: 58.1%

͞νμ: 39.9%

͞νe+νe : 2.0%

νμ: 91.7%

͞νμ: 7.0%

͞νe+νe : 1.3%

dataset
Dataset

Neutrinos ~ 8.2e20 POT

Antineutrinos ~ 3.0e20 POT

Special Run Periods

combining analyses
Combining & Analyses
  • Improve limits on θ13 with joint analysis
  • Similarly sized POT additions have constrained contours in the past
  • Pursue whether combined analysiswill facilitate more significantdisfavoring of the θ13 = 0 hypothesis
summary conclusion
Summary & Conclusion
  • Set limits on θ13 using an antineutrino beam
    • Estimated 3.5e20 POT exposure
    • Access to GeV energy scale neutrinos
  • Search for new physics
    • Anomalous matter effects
    • Antineutrino behavioral differences
  • Improve measurement of θ13 through a combined analysis
appearance pids
Appearance PIDs
  • Have used two particle identification algorithms (PIDs) in the past to select signal events
    • ANN11 – an artificial neural network
      • 11 input variables generate a PID output for analysis use
    • LEM – Library Event Matching
      • Matches topologies of candidate to library consisting of simulated background and signal events
      • Also produces a PID for analysis use
      • Offered increased sensitivity compared to ANN11