Difference between revisions of "CDC run 2551 drift time fits"
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+ | <pre> | ||
+ | Fit function: | ||
+ | TF1 *g2 = new TF1("g2","[0] * (1 + [1]*exp(([3]-x)/[2]) + [7]*exp(([3]-x)/[8]) ) / ( (1+exp(([3]-x)/[5])) * (1+exp((x-[4])/[6])) )"); | ||
+ | |||
+ | [0] overall height | ||
+ | [1] amplitude of 1st exp contrib to peak | ||
+ | [2] first exp fall-off | ||
+ | [3] t0 | ||
+ | [4] tmax | ||
+ | [5] slope up of t0 edge | ||
+ | [6] slope down of tmax edge | ||
+ | [7] amplitude of 2nd exp contrib to peak | ||
+ | [8] second exp fall-off | ||
+ | |||
+ | </pre> | ||
+ | |||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|[[Image:cdc_run2551_t0.png|thumb|x200px|Drift time fit t0]] | |[[Image:cdc_run2551_t0.png|thumb|x200px|Drift time fit t0]] |
Revision as of 12:27, 23 March 2015
Fit function: TF1 *g2 = new TF1("g2","[0] * (1 + [1]*exp(([3]-x)/[2]) + [7]*exp(([3]-x)/[8]) ) / ( (1+exp(([3]-x)/[5])) * (1+exp((x-[4])/[6])) )"); [0] overall height [1] amplitude of 1st exp contrib to peak [2] first exp fall-off [3] t0 [4] tmax [5] slope up of t0 edge [6] slope down of tmax edge [7] amplitude of 2nd exp contrib to peak [8] second exp fall-off