HAWC Sensitivity Andrew Smith April 20-21,2007 Collaboration Meeting.

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Presentation transcript:

HAWC Sensitivity Andrew Smith April 20-21,2007 Collaboration Meeting

Sensitivity with vs trigger threshold. No gamma/hadron separation

Sensitivity after gamma/hadron separation. Require at least 20 bkg events passing cuts.

nTop/cxPE distributions for various thresholds

Sensitivity after g/h separation. Based on extrapolation of fits to the bkg. Require >30% of gammas pass. No nTop/cxPE cuts>12. G/h separation breaks down for large events.

Relative sensitivity (compared to Milagro at 22 o ) as a function of source transit angle.

Sensitivity of HAWC: Integral sensitivity for Crab spectrum.

Do same analysis with slices in nTop instead of >trigger threshold. Combining slices in quadrature --> 117  /year

Effect of Elevation Raises threshold -> Changes Physics ~5x less EM energy at Milagro elevation compared to 4100m -> ~sqrt(5) lower sensitivity Using a 100 PMT trigger compare sensitivity: Eff of background is ~2x better at lower elev. Reletive sensitivity ~1.6

Effect of Curtains