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Background Subtraction Fitting technique: Fit mass with G 1 + G 2 + a + b/x Background is G 1 + a + b/x Use 3 cut Goal: put limit on systematic error
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Problems with Fits 1. Low mass background 2. High mass background
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1. Low mass background TDC cut can help No TDC cutTDC cut Background reduced
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2. High mass background No solution yet Other functions tried: G + G + a + b/x +c/x 2 G + G + a + bx +cx 2 G + G + a + bx G + G + exp(a + bx) Other techniques tried: bound parameters change range of fit better worse
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Results G = 41.5 G = 46.5 3% shift 11% shift 0.5% shift
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-t dependence G = 41.5G = 46.5
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A N -t dependence G = 41.5G = 46.5
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-t dependence of background G = 46.5 G = 41.5
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Unpolarized beam G = 46.5 -t dependence
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