Short-­‐baseline appearance ߥߤ՜ߥe with off-­‐axis NuMI ( ) ( ) Fermilab Site Ryan Patterson * Caltech Oscillation interpretation of LSND and MiniBooNE excesses suggests 'm2 ~ few eV2. Off-­‐axis NuMI: Eߥ ~ 2 GeV ֜Place ߥe-­‐sensitive detector off-­‐axis at L ~ 1 to 2 km ՜Osc. sensitivities? (* for R. Patterson and M. Messier) depth of on-­‐axis beam Short-­‐baseline appearance ߥߤ՜ߥe with off-­‐axis NuMI ( ) ( ) Ryan Patterson * Caltech Oscillation interpretation of LSND and MiniBooNE excesses suggests 'm2 ~ few eV2. Off-­‐axis NuMI: Eߥ ~ 2 GeV ֜Place ߥe-­‐sensitive detector off-­‐axis at L ~ 1 to 2 km ՜Osc. sensitivities? (* for R. Patterson and M. Messier) Fermilab Site NuMI/MINOS shaft 105 meters (approx. cost today) $4M + 15% (overruns) + 30% (inflation) This shaft: $7.5M (125 m, out of plane) or $9.2M (153 m, in plane) depth of on-­‐axis beam Experimental configurations examined A) EKǀ͛Ɛ ͞ƐƉĂƌĞ͟EK^ as 2nd detector + 0.7 MW beam >ŽǁĐŽƐƚ͕ďƵƚĚŽĞƐŶ͛ƚƋƵŝƚĞŚĂǀĞƚŚĞƐĞŶƐŝƚŝǀŝƚLJŶĞĞĚĞĚ B) ߤBooNE-­‐scale LAr TPCs at 1 km (existing site) and 2 km (new site) + 0.7 MW beam Not bad, but could do better C) Larger LAr TPC at 2 km site (210 ton fiducial) + 2.4 MW beam (Project X) >5ߪ coverage of region of interest Efficiencies assumed in sensitivities are shown in the table below. -­‐ ͞>ƌϭ͟: ~2п increase in signal efficiency over the NOvA detectors -­‐ ͞>ƌϮ͙͗͟ƉůƵƐ~2п decrease in mis-­‐ID rates Synergy with long-­‐baseline program -­‐ Reduced solid angle off-­‐axis ND -­‐ Serve as LAr near detectors -­‐ Improved understanding of backgrounds in NOvA using LAr NDdata Ryan Patterson, Caltech 3 Showing antineutrino numbers here ՜ Neutrino case is easier due to cross section ĂĚǀĂŶƚĂŐĞƐ͕ĂŶĚLJŽƵ͛ůůǁĂŶƚĂƚůĞĂƐƚƚŽ have sensitivity in antineutrino mode. For an LSND-­‐like scenario with the intermediate ĞdžƉĞƌŝŵĞŶƚĂůƐĞƚƵƉ;Ϳ͕ĞdžƉĞĐƚĂƚƚŚĞϮŬŵƐŝƚĞ͙ 10,800 background events ..1,300 signal (appearance) events 5ߪ sensitivities shown Ryan Patterson, Caltech Above: all experimental scenarios on one plot Left: dependence on baseline (e.g., can do better at low 'm2 with slightly longer baseline) Systematic errors do matter here. Assumptions used are shown in backup slides. May find that LAr performance (efficiency, systematics) even surpasses the assumptions here as R&D continues. Backups Ryan Patterson, Caltech 5 Ryan Patterson, Caltech 6 Ryan Patterson, Caltech 7 For short-­‐baseline osc. ͙ Far and Near detectors take on non-­‐traditional roles͙;EĞdžƚϯƉĂŐĞƐͿ Signal in Far ‫ ׈‬ (Neutrino parent decay locations are folded in using Flugg-­‐based NuMI beamline simulation) Ryan Patterson, Caltech 8 Signal in Near ‫ ׈‬ (Neutrino parent decay locations are folded in using Flugg-­‐based NuMI beamline simulation) Ryan Patterson, Caltech 9 Signal in Both ‫ ׈‬ (Neutrino parent decay locations are folded in using Flugg-­‐based NuMI beamline simulation) Ryan Patterson, Caltech 10