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Neutrino Baseline Experiments for Precise Oscillation Parameters Determination

Explore the physics of 9400 km baseline experiments, disappearance and appearance experiments, oscillation patterns, matter effects, and determination of neutrino oscillation parameters with high energy resolution and minimal systematic uncertainties.

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Neutrino Baseline Experiments for Precise Oscillation Parameters Determination

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  1. Physics of 9400 km Baseline Experiments • Fermilab-Beijing: • Disappearance experiment: • First oscillation minimum at 17 GeV. • ‘High energy’ beam called for. Good for the event rates • Good energy resolution. Relatively free of the systematic uncertainties  precise determination of the m223 • Second minimum at 5 GeV: spectacular oscillation pattern well visible. • Full oscillation observed  decoupling of m223 and mixing angle determination  precise determination of sin2(223) • Appearance experiment(s): • ()(): systematic similar to CNGS, but the signal 40  higher (at the oscillation maximum!) • ()(e): matter enhancement, clean determination of the mass hierarchy, relative insensitivity to CP violation APS Neutrino Study Meeting, June 28-30, 2004, Snowmass

  2. Physics of 9400 km Baseline Experiments(cont…) • Strong matter effect: •  20 amplification in ()(e) probability over max in vacuum •  20 improvement in S/N • Signal rate is ~ 200 events/Mton-year for sin2(213) = 0.01.    • Sign of M2 unambiguously determined     • Weak dependence on : • Signal compared with that from a shorter baseline (2100 km) can constrain  Constraints (1,2,3 ) after 2 years of running and a 1 Mton detector, input parameters marked with X. APS Neutrino Study Meeting, June 28-30, 2004, Snowmass

  3. Physics of “9400 km+2100” km 2-Baseline Experiments • Fermilab-Beijing + JPARC-Beijing: • Ultimate ()(e)appearance experiment: • Different energies/baselines  different relative contributions of matter enhancements and CP violating effects  clean determination of the neutrino oscillation parameters, breaking degeneracy of interpretation APS Neutrino Study Meeting, June 28-30, 2004, Snowmass

  4. Detector Issues • Disappearance experiment: known beam flavor, do not need charge determination. Need • muon identification • Good energy resolution • Appearance : • (): very good granularity and high resolution (a la ICARUS) • (e): • good and efficient electron identification in complex inelastic events (even for the JPARC beam) • excellent e/0 separation  Large Liquid Argon TPC a natural candidate  APS Neutrino Study Meeting, June 28-30, 2004, Snowmass

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