Neutrino Physics Opportunities for Fermilab Steering Group 6/12/07 Andy Lankford UC Irvine

NPG: Presentations 5/10 Gene Beier: NuSAG Status Report to NSAC 5/14 Peter Meyers: NuSAG 5/22 Henryk Piekarz: A Double, 480 GeV, Fast Cycling Proton Accelerator for Production of Neutrino Beams at Fermilab 5/22 Janet Conrad: An Ultra-High Statistics Muon Neutrino Scattering Experiment at the TeVatron 5/29 Mats Lindroos: Beta-beams 5/31 Bonnie Fleming: Ideas on LArTPC Detectors 5/31 Kate Scholberg: Neutrino Physics with a Stopped Pion Source

Long-Baseline Oscillation Experiments Flagship of neutrino physics –theta_13, mass hierarchy, CP violation NuSAG is addressing –Report to HEPAP expected in mid-July –NuSAG is relying heavily on BNL-FNAL study Examining options for next generation: –Off-axis Beam vs. Wide-band Beam –Liquid argon TPC vs. Water cerenkov Experiments require as many neutrino interactions as possible –Neutrino flux –Detector mass –Next generation would benefit more from an order of magnitude improvement than a factor of two improvement Possible conclusion: Need results from current generation before finalizing next generation NPG is to build upon NuSAG report

Double 480 GeV Proton Accelerator H. Piekarz Two super-ferric rings in TeVatron –Designed for high beam power Note: current booster cannot provide current for more than 4.8 MW Note: power via intensity rather than energy preferred Produces high energy neutrinos –Needs very long baselines –Energies much higher than optimum for U.S.-based experiments High energy comes with high intrinsic neu_e bkgd. Not rated highly by NPG

Neutrino Scattering using TeVatron Beam J. Conrad Deep inelastic scattering –100x NuTeV –50k neu_mu + e elastic scatters Needs high statistics –3x NuTeV fiducial volume –20x NuTeV proton intensity (5E19 POT/yr) –2x NuTeV running period Unique precision electroweak experiment –Complements direct BSM exploration of LHC NPG viewed physics opportunity favorably

Beta-beams M. Lindroos Presentation heard by FSG Probably for far future Akin to neutrino factory Not examined carefully for roadmap

LArTPC Detectors B. Fleming Roadmap from R&D to multi-kiloton –Includes ton experiments on site Several options mentioned –Cross-sections, fine-grained near-detector for NOvA microBooNE: 50T fiducial –Investigate MiniBooNE low-E discrepancy Physics program now + LAr R&D for future program –Using existing beams NPG found above synergy very enticing

Physics with Stopped Pion Source K. Scholberg Based on SNS proposal Stopped pion produces 3 low-energy neus Physics: –Cross-sections for astrophysics (SN physics) –Coherent elastic neu-nucleus scattering (ambitious) –Sterile neutrino oscillations Requires ~1 MW NPG found interesting

Facilities for Neutrino Beams - 1 #2 High Intensity Proton Sources –Should include 8 GeV beams –Supports: Oscillation program LArTPC experiments onsite Stopped pion source #7 Proton sources by reconfiguring FNAL collider complex –Similar to above; supports same physics #8 Proton sources with New Booster + 1 GeV Linac –Similar to above; supports same physics #9 Double, 480 GeV, Fast Cycling Proton Accelerator –Supports oscillation program, but not well –Competes with other uses of TeVatron

Facilities for Neutrino Beams - 2 #10 1 TeV protons from TeVatron –Supports precision deep-inelastic scattering program –Could also measure cross-sections with LArTPC –Competes with other uses of TeVatron #13 Beta-beams –Supports future oscillation program –In post-ILC era Neutrino Factories (should be on list) –Supports future oscillation program –In post-ILC era

Facilities for Neutrino Beams - 3 Summary: –Interesting for Neutrino Physics: Mid-term #2 High Intensity Proton Sources #7 Proton sources by reconfiguring FNAL complex #8 Proton sources with New Booster + 1 GeV Linac #10 1 TeV protons from TeVatron –Interesting for Neutrino Physics: Long-term #13 Beta-beams Neutrino Factories –Not particularly interesting for Neutrino Physics #9 Double, 480 GeV, Fast Cycling Proton Accelerator –More protons are better Competition with other programs (proton economics0 No clear breakpoints in required intensities Could foresee using >1 MW at low energy (e.g. 8 GeV) For fixed neutrino flux, NuMI energy may be higher than optimum

FY09 Opportunities Possible investment ideas for FY09 based on neutrino presentations –LArTPC R&D E.g. towards neu_e monitor for NuMI –Hall for near-detector in NuMI line –TeVatron neutrino line