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Road Map of Future Neutrino Physics A personal view

Road Map of Future Neutrino Physics A personal view. Ken Peach Round Table discussion at the 6 th NuFACT Workshop Osaka, Japan 26 th July – 1 st August 2004. Key questions. Is the LSND effect real? (Desperately waiting for MiniBooNE) If LSND effect real

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Road Map of Future Neutrino Physics A personal view

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  1. Road Map of Future Neutrino PhysicsA personal view Ken Peach Round Table discussion at the 6th NuFACT Workshop Osaka, Japan 26th July – 1st August 2004

  2. Key questions • Is the LSND effect real? • (Desperately waiting for MiniBooNE) • If LSND effect real • What happens to the Standard Model? • What experimental programme is required? • Is q13>0? • Need T2K, “child-of-CHOOZ”, … • If q13=0 (or <<1o) • Why? • What next? • What is the absolute mass scale? • KATRIN, 0nbb, cosmology/astrophysics? • It makes a difference if mlightest = 0eV, 10-10eV, 10-1eV • Do neutrinos have a Majorana component? • 0nbb • If not, why not? • If yes • How to measure the phases? • What is the Majorana mass mechanism?

  3. Let us assume When? • LSND is not confirmed • q13>0 … then we need to measure… • q13 precisely • Need to understand the hierarchy of the angles • Phase angle dprecisely • Need to look for CP/T violation • d may not be large • Determine the sign of Dm223 • Possibly parasitic on one of the above • Determine the absolute mass scale • KATRIN, 0nbb, cosmology/astrophysics • Look for 0nbb Note LSND apart SK, SNO, KL, K2K show that non-standard n effects are small

  4. Neutrinos ne disappearance ne nm appearance ne nt appearance nm disappearance nm ne appearance nm nt appearance … and the corresponding antineutrino interactions Oscillations: What to Measure? Note: the beam requirements for these experiments are: high intensity known flux known spectrum known composition (preferably no background)

  5. CP sensitivity domain of 99% CL effect for maximal CP violation 0.3 0.5 2 5 Degeneracies – need complementary measurements (baselines, energies, flavours, channels) Bouchez

  6. Build the Neutrino Factory as soon as possible Numi/CNGS, Off-Axis Beams, SuperBeams, Beta Beam, Neutrino Factory How to get there? The Fast Train The Slow Train

  7. The Fast Train Advantages fastest route (possibly) cheapest route (possibly) Disadvantages money (big commitment) politics (related to money) The Slow Train Advantages incremental (duplication?) lower risk (e.g. if no CPV) Disadvantages costs more (duplication) may never get there (why measure better?) How to choose?

  8. A Neutrino Factory is … Target Capture Proton Driver … an accelerator complex designed to produce >1020 muon decays per year directed at a detector thousands of km away Principal Components High Power H(-) source ‘far’ detector (5000-8000km) Muon Storage Ring Cooling Muon Acceleration ‘local’ detectors ‘near’ detector (1000-3000km)

  9. Neutrino Factory Challenges       9 36 72 5184 Not all match efficiently • Technology • Proton driver • RCS or LINAC? • Proton energy? • HARP, E910, MIPP • Target • MW beam power • Mercury, solid, liquid-cooled, pellet, … • Pion/muon collection and/or cooling • Magnetic Horns or Solenoids? • Phase Rotators, FFAG’s, cooling (ring, linear, …)? • RF and acceleration • RLA’s or FFAG’s? • Muon Storage Ring • Racetrack, triangular or bow-tie • Conventional or FFAG? Options 2 6 3 2 x 6 2 3 x 2 ¾ don’t make any sense ~ 9 feasible NF designs!!!! Some don’t work – divide by 2

  10. Neutrino Factory R&D • High Power proton drivers • MW power, ns pulses • RF • 30% of the cost? • Cooling • How much? (20% of the cost?) • RLA or FFAG? • Which is cheaper? BNL Feasibality Study 2

  11. Summary • My view • we will need a neutrino factory • especially if the neutrino sector is more complicated than 3 generation mixing • there are enough technology options to be confident that it will work • but we need demonstrators • need to avoid (too much) duplication • (how many Megaton Water Cerenkov’s equal one Neutrino Factory?)

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