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Optimizing Neutrino Facilities for Large q13: A Discussion from NuFact 2011

This discussion explores the comparison of facilities for CP violation and mass ordering measurements in the context of large q13. Topics include facility optimization, systematics, impact factors, performance comparison, and related questions in neutrino physics. The aim is to understand how to improve experimental fits, address theoretical challenges, and express sensitivities effectively. Key considerations include precision on dCP, choice of experimental setups, and potential implications for new physics.

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Optimizing Neutrino Facilities for Large q13: A Discussion from NuFact 2011

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  1. Comparison of facilities (discussion, my point of view) NuFact 2011 August 1-6, 2011 Geneva, Switzerland Walter Winter Universität Würzburg TexPoint fonts used in EMF: AAAAAAAA

  2. Comparison: CP violation CP fraction Global fitFogli et al, 2011 P. Huber @ ECFA Panel review, May 2011

  3. Comparison: Mass ordering CP fraction Do we really want a facilitywhich cannot measure the mass orderingif T2K is confirmed? Need longer L! Global fitFogli et al, 2011 P. Huber @ ECFA Panel review, May 2011

  4. Optimization for large q13 Do we know how the optimal setups for large q13 look like? Are the proposed setups optimal?

  5. Beta beams: Optimization for large q13? • “Minimal“ beta beam for T2K hint:L > 500 km, g>160 • Lower g possible for B, Li if high enough Lumi(Earth matter effects!) q13>0, 5s, all dCPMH, 3s, all dCPCPV, 3s, 80% dCP (arXiv:0804.4000)

  6. Neutrino Factory: Optimization for large q13? Open questions: Staging? Platinum channel? Matter density uncertainty? q13>0, 5s, all dCPMH, 3s, all dCPCPV, 3s, 80% dCP Optimized MIND, CPV 20 kt TASD, 4 GeV Tang, Winter, 0911.5052 Agarwalla, Huber, Tang, Winter, 1012.1872

  7. Superbeams: Optimization for large q13? • Some general optimization performed (e.g. Barger et al, hep-ph/0607177) • However:Not so clear (to me) how “minimal“ setup would look like • A high intensity upgrade of MINOS?(possibly with lower Ep: need just long enough L to measure mass ordering) From early WBB optimization … CP fracs 0, 0.5, 1 CP fracs 0, 0.5,0.75

  8. Optimization: conclusion? • For NF, BB, we can predict the optimal setup as a fct. of sin22q13 and detector performance • For SB, typically external boundary conditions have lead to a particular optimization; also more complicated function of Ep, OA, horn tune  can that be further optimized for a particular q13?

  9. Systematics: Cross secs. • Normalization error especially important for precision measurements for large q13! Backgrounds less relevant! • Superbeam:nm ne,nm nm: Where ne X-sec measured? • Beta beam:ne nm: Wherenm X-sec measured? • Superbeam+Beta beam:ND in SB measures X-sec needed for FD in BB, and vice versa  synergy? • NuFact:Only nm X-Secsneeded (at ND,if both polarities) (Tang, Winter, arXiv:0903.3039)

  10. Other impact factors? • Can luminosity be easily achieved? How robust are these predictions? • Can the experiment constrain the oscillation parameters in a self-consistent way by using different osc. channels? • Are there other, potentially dangerous, systematics? • What happens if there is new physics? Can the experiment be upgraded? • How should one show these impacts in a comparison plot?

  11. Performance comparison … for large q13? T2K+NOvA+Double Chooz+Daya BayHuber, Lindner, Schwetz, Winter, 2009 • The key question: How can future experiment improve the fit expected from the next gener.? • The key problems: • Theory: How much precision on dCP do I want? E. g. Precision ~ quark sector, error on dCP ~ qC (QLC), etc. • The value of dCP will likely remain rather vague (since reactor exps have no dCPsensitivity) • Two solutions: • Show funct. dep. on dCP? • Choose „benchmark“ points? b) a) (NF, Laing) T2HK, hep-ph/0310307

  12. Related questions • Which setup would one choose for large q13 (physics wise)? A superbeam? The one with the best dCP precision? The one with the best potential to search for new physics? The most robust setup? • How to express sensitivities in terms of error on parameters? No systematics vs. conservative systematics? Who defines that? How quantify luminosity impact/cross section impact?

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