July 3th Here is a summary of the dca (signed dca and dca in Z). I present also the pull, defined as dca/sigma(dca) vs pt, 1/pt.

P06ib

No svt,ssd hits.

cucu62

DCA_XY

For the 2d plot of sDca vs pt


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

DCA_Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

P06ic

P06id

This is for the first P06id : tracks are selected with (svt+ss hits >=2 ).
According to the gaps of the svt, I look only in the range in phi where there are at least 2 svt hits.

cucu62

DCA_XY


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

DCA_Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

cucu200

DCA_XY


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

DCA_Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

pull

For each column, the 3 cases correspond to the tracks with 2,3 and 4 (svt+ssd) hits


Figure : pull XY vs pt (cucu62)	Figure : pull XY vs pt (cucu200)

Comparing with ssd only (CuCu62)

Then I looked for tracks with only ssd hits.
Again , the range in phi is shown in the next pictures, since of there were 2 ssd ladders off.

DCA XY


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

DCA Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

Result of differents fits


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

new P06id

cucu200

DCA_XY


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

DCA_Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

pull

Then 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


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

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

cucu200 bis

I didn't look first at the dca vs phi to see the corrections from this production.
In fact, the coverage in phi seems to be better now .


Figure : svt+ssd > 2	Figure : svt+ssd > 3	Figure : svt+ssd > 4

Efficiency


Figure : svt	Figure : ssd	Figure : svt+ssd

DCA_XY


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

DCA_Z


Figure : DCA Z vs pt	Figure : DCA Z vs 1/pt

pull

Then 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


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.

Jonathan Bouchet

Last modified: Tue Jul 4 19:30:27 EDT 2006