From: Heidi Schellman totnue oscnue nomass negative 20GeVnf 6472.89 162.895 107.032 45.1315 30GeVnf 21896.7 288.07 223.239 115.141 50GeVnf 101494 515.511 463.249 282.504 totnumu oscnue he 6475.63 155.326 98.1059 40.3612 me 2845.61 108.25 49.5294 15.6122 le 1086.82 28.3479 12.1083 5.899 sin13 0.05 dm23 0.0035 ev^2 rho 2.7 gr/cm^3 l 2900 km m 10 kt N mu 10^20 mudecay N numi 4 nominal I considered positive, neutral and negative mass effects ------------------------------------------------------------------------- In the meeting I was wondering if the matter effects resonance might actually make longer baselines much more attractive for high background experiments. The idea is that the matter enhancement is growing as l^2 while the flux is falling as l^2. The statistics for the signal thus are ~ the same at either baseline but the overall neutrino flux falls as l^2 so one can gain quite a lot. This is a mathematica calculation with constant density and dm12 = 0 and theta23 = pi/4 delta = 0. sin2theta13 is 0.05, dm23 = 0.0035 ev^2, density of earth is 2.7 gm/cm&3 target is 10 kt, 10^20 muon decays compared to 4 times present numi flux The beamlines are neutrino factories storing positive muons and the NUMI lo,me and he fluxes scaled up by a factor of 4. I have checked the neutrino factory fluxes against the plots in Bueno et al with similar parameters. For 2900 km 2900 totnue oscnue nomass negative osc/tot 20GeVnf 6472.89 162.90 107.03 45.13 0.025 30GeVnf 21896. 288.07 223.24 115.14 0.013 50GeVnf 101494. 515.51 463.25 282.50 0.005 totnumu oscnue he 6475.63 155.33 98.11 40.36 0.024 me 2845.61 108.25 49.53 15.61 0.038 le 1086.82 28.35 12.11 5.90 0.026 for 7200 km 7200 totnue oscnue nomass negative osc/tot 20GeVnf 1050.10 101.87 14.59 5.25 0.097 30GeVnf 3552.30 223.99 73.36 6.18 0.063 50GeVnf 16465.4 405.14 270.16 9.94 0.025 totnumu oscnue he 1050.54 86.05 16.20 4.31 0.082 me 475.81 24.14 6.65 2.32 0.051 le 176.31 8.39 2.11 1.19 0.048 note that for the NUMI he beam, the loss of statistics is a factor of 2 in the signal and a factor of 6 in the beam - the actual gain is a factor of 3.4 over 2900 in S/N. For the 50 GeV beam, the gain is a factor of 4.8 and the oscillation fraction is close to 10%.