July 5th Here is a summary of the dca (signed dca and dca in Z) for the second P06id production (cucu 200 MinBias). I present also the pull, defined as dca/sigma(dca) vs pt, 1/pt.

P06id

The cuts have changed a little to increase a little bit the statistic in order to get some realistics fits.
Cuts are :

|z vertex | < 10
| eta | < 1
N Fitted Points > 15

Efficiency

plot


Figure 7 : svt efficiency	Figure 9 : ssd efficiency	Figure 10 : svt+ssd efficiency

svt

No of poss hits	0	1	2	3	4	5	6
primary tracks	1	0.1385	0.3938	0.4395	0.2530	0	0

ssd

No of poss hits	0	1	2
primary tracks	0.9996	0.49818	0.09024	0.0000

svt+ssd

No of poss hits	0	1	2	3	4	5	6	7	8
primary tracks	1.0000	0.42575	0.29325	0.44035	0.46838	0.27661	0.18619	0.0000	0.0000

Range in Phi

This plot show the range in phi for this production. Whereas the first P06id production, the coverage for the case (svt+ssd) > 2 in phi is full.

Dca XY


Figure : Signed Dca vs pt	Figure : Signed Dca vs 1/pt

Dca Z

vs transverse momentum pt


Figure : Dca Z vs pt	Figure : Dca Z vs 1/pt

vs momentum P


Figure : Dca Z vs P	Figure : Dca Z vs 1/P

Pull

I look at tracks above differents tracks :

for tracks with 2 (svt+ssd) hits and with a pull in XY above 1,2 and 3
for tracks with 3 (svt+ssd) hits and with a pull in XY above 1,2 and 3
for tracks with 4 (svt+ssd) hits and with a pull in XY above 1,2 and 3

Plots


Figure : pull > 1	Figure : pull > 2	Figure : pull > 3

In these plots , the number of events is in Y and the number of tracks in this event,which passed the cut is in X.

Pt oh these tracks


Figure : pull > 1	Figure : pull > 2	Figure : pull > 3

In these plots , the pt of the previous tracks are shown.

Result of differents fits


Figure : DCA XY vs pt	Figure : DCA XY vs 1/pt

the Dca vs pt was fitted by sqrt((a/p_t)^2 + b); it gives a better approximation than a/p_t;
The Dca vs inv pt was fitted by a pol2, but it doesn't give a better result than a pol1 , as I saw for the Dca in XY for the SSD only.

title 5

Jonathan Bouchet

Last modified: Wed Jul 5 19:38:42 EDT 2006