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SBNW11 Summary June 23, 2011

SBNW11 Summary June 23, 2011. Louis – Experimental Results & Theoretical Interpretations Van de Water – Future Facilities & Experiments. 109 Registrants 44 Institutions Talks are on Web Page https://indico.fnal.gov/event/sbnw2011. What is Short Baseline?.

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SBNW11 Summary June 23, 2011

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  1. SBNW11 SummaryJune 23, 2011 Louis – Experimental Results & Theoretical Interpretations Van de Water – Future Facilities & Experiments

  2. 109 Registrants 44 Institutions Talks are on Web Page https://indico.fnal.gov/event/sbnw2011

  3. What is Short Baseline? “Short” refers to Ln/En and not just Ln Note that Ln/En is proportional to the n lifetime in its CM frame Our definition of “Short” is Ln/En ~ 1 (km/GeV or m/MeV) This definition includes radioactive n source experiments (~1 m/1 MeV), reactor n experiments (~5 m/5 MeV), accelerator n experiments (~1 km/1 GeV), & IceCube atmospheric n (~1000 km/1 TeV)

  4. Motivation for SBNW11 Tantalizing results from short (& long) baseline experiments (LSND, MiniBooNE, MINOS, Reactor Antineutrinos, Radioactive Neutrino Sources, etc.) may possibly have a profound impact on our understanding of particle & nuclear physics. Neutrino cross sections are very interesting: nuclear effects, short-range correlations, pion exchange currents, pion absorption, initial state interactions, & final state interactions make this a rich and compelling area of study. Nuclear effects can affect neutrinos and antineutrinos differently and affect CP violation interpretations.

  5. MiniBooNENeutrino Results – (Mills) • A. Aguilar-Arevalo et al., Phys. • Rev. Lett. 102, 101802 (2009)

  6. LSND & MiniBooNE Antineutrino Results • A. Aguilar-Arevalo et al., Phys. • Rev. Lett. 105, 181801 (2010)

  7. nmCCQE Scattering - (Carlson) A.A. Aguilar-Arevalo, Phys. Rev. D81, 092005 (2010). Extremely surprising result - CCQE C)>6 n) How can this be? Not seen before, requires correlations. Fermi Gas has no correlations and should be an overestimate. A possible explanation involves short-range correlations & 2-body pion-exchange currents: Joe Carlson et al., Phys.Rev.C65, 024002 (2002) & Gerry Garvey. These nuclear effects could have a big effect on searches for CP Violation.

  8. Initial MINOS nm Disappearance Results innMode(Thomas) “The probability that the underlying nm and nm parameters are identical is 2.0%.” (arXiv:1104.0344) Expect nm disappearance above 10 GeV for LSND neutrino oscillations.

  9. Initial MINOS nm Disappearance Results in nMode Expect nm disappearance above 10 GeV for LSND neutrino oscillations.

  10. Reactor Antineutrino Anomaly(Mention) arXiv: 1101.2755 R=0.937+-0.027

  11. Radioactive Neutrino Sources(Gavrin) R=0.86+-0.05 SAGE, PRC 73 (2006) 045805 arXiv:nucl-ex/0512041 Giunti & Laveder, arXiv:1006.3244

  12. Theoretical Interpretations Sterile neutrinos (3+N models with CP violation) - Ignarra Non-standard interactions – Kopp & Friedland Lorentz violation - Diaz CPT violation Sterile n decay - Gninenko

  13. Global Fits to World n Data(Ignarra)(LSND, KARMEN, MiniBooNE, Reactor, MINOS, CDHS, etc.) all n & n n only 3+1 Christina Ignarra; Updated from G. Karagiorgi et al., PRD80, 07300 (2009) Kopp, Maltoni, & Schwetz, arXiv:1103.4570 Key test is a search for nm disappearance!

  14. Non Standard Interactions (Kopp)

  15. SterilenDecay?(Gninenko) • The decay of a ~50 MeV sterile nhas been shown to accommodate the LSND & MiniBooNE excesses • Gninenko, PRL 103, 241802 (2009) • arXiv:1009.5536

  16. Lorentz Violation? (Diaz) arxiv: 1012.5985

  17. Conclusions • World antineutrino data agree very well with a 3+1 model • Key test of 3+1 is a search for nm disappearance • World neutrino + antineutrino data can be explained somewhat well by a 3+2 model with CP violation, although there is tension between appearance and disappearance experiments • Other models are possible besides 3+N: NSI, sterile neutrino decay, Lorentz violation, CPT violation, etc. • Knowledge of cross sections important for interpretations of short and long baseline oscillations

  18. WorkShop Summary of Future Experiments and Facilities: • Key questions • Requirements for future beam experiments • Future experiments/facilities • Short term • Mid term • Long term • Summary

  19. Some Key Questions: • Need to make smoking gun measurement. • How do we do it quickly? • vμ disappearance?? • Need to make a >5 sigma measurement at L/E ~1 to convince ourselves and the community of new physics. • Not sure of underlying physics, so need an experiment (or set of experiments) with diverse capabilities that can test many ideas. • Cross section effects are important, and can change interpretation of oscillation results.

  20. Requirements for next beamline experiments: Need to measure neutrino properties to the few percent level. Rate = Flux x Cross Section x detector response Flux: Intense source -> Booster/MI, CERN-PS, SNS, cyclotrons, LBNE, Project X. Measure flux insitu using H/D2 targets. Cross Section: Need better models, especially to measure correct neutrino energy. Much data on Carbon, need more data for Ar. Detector Response: LAr would allow separation of electrons and gamma-rays. Want good tracking and magnetic fields. Two detectors or long detector to measure L/E effects.

  21. Near Term Goals (~few years)Search for smoking gun: • Keep running Miniboone to improve antineutrino oscillation statistics (collect ~1.5E21 POT). • Complete SB/MB vμ disappearance. • Oscillation updates from Minos (vμ disappearance, antinu NC, LV). • Analyze IceCube data, look for vμ disappearance. • Make more cross section measurements with Minerva, Minos, Miniboone, ArgoNeut. • Develop better cross section models. ->Apply to recent oscillation results, i.e. shift in reconstructed neutrino energy. Could it explain the difference in Minibooneve and ve appearance result?

  22. IceCube (L/E ~10TeV/10,000km ~1) (Warren Huelsnitz) - They are working on full systematicsand willhave results in the future.

  23. Mid Term Possibilities (3-7 years)Make Detailed measurements to begin understanding the underlying physics: • Run uBooNE to test MB low energy anomaly. • Build BooNE (near detector) – decisive (~5 sigma), quick, inexpensive, on Carbon (measure disappearance/appearance). • Minos+ running to search for sterile nu, NSI, etc. • NOvA 2nd near detector (L/E ~1) and SciNova cross sections. • Build and run two detector LAr experiments at CERN and FNAL to make definitive test of appearance, disappearance, nu decay, etc. • Build OscSNS/cyclotron experiment (stop pion source) to retest LSND directly >5 sigma. • Katrin results (look for kinks in E distribution above end point). • Develop Muon Storage ring, Reactor (SCRAAM) and Source (LENS, Ga, Borexino) experiments.

  24. MicroBooNE'sLArTPC detection technique extremely powerfulSensitivities in neutrino mode (R. Guenette) • e/γ separation capability removes νμinduced single γ backgrounds • electron neutrino efficiency: ~x2 better than MiniBooNE • sensitivity at low energies (down to tens of MeV compared to 200 MeV on MiniBooNE) As a counting experiment: translates to 5σ sensitivity if excess is νe, 4σ if excess is γ Low energy excess above background if excess is electrons Low energy excess above background if excess is photons

  25. BooNE: MB like near detector at 200m, 1E20 POT each mode (only 1 year running) – Full systematics (Mills) Neutrino mode appearance Antineutrino mode appearance - Also >5σ disappearance sensitivity inboth modes.

  26. Minos+ and NoVA(J. Thomas, R. Patterson, J. Cooper) NoVA with a second near detector MINOS+ disappearance • NoVA has also considered a off axis • near detector. • Given the similar energies and signal, • NoVA is taking seriously SB • oscillations/physics as a source of • background they need to understand.

  27. uBoonE and LaLAr on the BNB (Roxanne Guenette) (Stat errors only) (Stat errors only) Assumes 2-3E20 POT/yr > Project X feeding the BNB could significantly (~ x10) reduce the required run time!

  28. Moving ICARUS (600T LAr) to CERN, build a near detector (150T LAr) and rebuild the PS neutrino source (F. Pietropaola). • CERN Science council is seriously considering the proposal and will make a • recommendation soon (June 28) whether to proceed with real design and costing work.

  29. OscSNS at ORNL: A Smoking Gun Measurement of Active-Sterile Neutrino Oscillations MB like detector at the SNS 1kton LS detector At 60m SNS: ~1 GeV, ~1.4 MW • nm -> ne ; nep -> e+n => re-measure LSND an order of magnitude better. • nm -> ns ; Monoenergeticnm; nm C -> nm C*(15.11) => search for sterile ν OscSNS would be capable of making precision measurements of ne appearance & nm disappearance and proving, for example, the existence of sterile neutrinos! (see Phys. Rev. D72, 092001 (2005)). Flux shapes and cross sections are known very well.

  30. Long Term Possibilities (>8 years)Make Precision measurements of new physics: • If smoking gun found, then design/build a series of experiments with Project X to explore in detail the source of new physics: • DIF (300-600kW at 3GeV with a new accumulator) • 15-30 times more flux with reduced Kaon background. • DIF (25-50kW at 8GeV with antiproton accumulator) directly into BNB. • DAR difficult due to long duty cycle. • Beam dump exotics - axions, paraphotons, etc. • Cross sections.

  31. SBNW11 Workshop Summary: • The conference succeeded in starting to build a community to investigate physics at the L/E ~1 scale. • We need to find a smoking gun soon: • More MB running, SB/MB disappearance, BooNE, uBooNE, IceCube. • LAr will play a crucial role in the future, and can test in detail many of the models such as 3+N, nu decay, nuclear effects, LV, etc. • We need to continue work on cross sections for Carbon and Ar. • Nuclear effects are important, especially to energy determination, which can affect oscillation parameters. • Whatever technology/experiments we do, we needoverwhelmingstatistics (protons)to understand details of the new physics. • Project X would be an outstanding opportunity for short baseline physics.

  32. Backup

  33. Global Fits to World n Data all n & n 3+1 Updated from G. Karagiorgi et al., PRD80, 07300 (2009) Kopp, Maltoni, & Schwetz, arXiv:1103.4570

  34. Future Projections Current: 5.66E20 POT: E > 475 MeV MiniBooNEveAppearance Oscillations 8.58E20 POT • We have reprocessed up to 8.58E20 POT and are currently analyzing the data. We will • release updated oscillation results soon (this summer) • - 50% more POT and new K+ constraint from SciBooNE. • Joint SciBooNE/MiniBooNEvμ disappearance analysis ongoing with results in the fall.

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