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Physics of 9400 km Baseline Experiments

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

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Physics of 9400 km Baseline Experiments

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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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