Efficiency of cal-slt electron finder

Efficiency of the cal-slt electron finder

Last update: 8 dec 1997

L.W. Wiggers

In this study I used a dst tape and selected the different tlt electron finders. Then I looked whether I could find a cal-slt electron (see algorithm) in the same theta-range. The other way around, I also looked when selecting the cal-slt electron, whether there was a tlt electron:

total number of events: 17031,
run: 25189 (970224),
DST-tape without further selection.

cuts:

cal-slt electron energy > 2.5 GeV and theta>0.5,
tlt electron energy >3 GeV , probablity (if appropriate) > 0.75 and 0.5<theta<3.1,
*if selection on tlt electron then cal-slt electron should be within 0.1 rad of tlt electron.

Results per event (the 4 tlt electron finders are: Elec, Local, Sinistra and Emille).
condition cal-slt* cal_slt tlt1 tlt2 tlt3 tlt4 flt iso-e golden nc exo nc 4

cal-slt electron - 4679 1939 2808 2779 1418 4289 1068 1256

tlt1-electron 1938 1939 1943 1859 1909 1350 1942 693 695

tlt2-electron 2722 2808 1859 3000 2416 1357 2882 904 1045

tlt3-electron 2735 2779 1909 2416 2814 1387 2789 961 1042

tlt4-electron 1417 1418 1350 1357 1387 1421 1418 487 497

tlt4-electron (prob>0.5) - 1696 1572 1619 1660 1700 1697 612 629

flt iso-e - 4289 1942 2882 2789 1418 5511 1156 1264

golden nc bit - 1068 693 904 961 487 1156 1175 632

exo nc 4 bit - 1256 695 1045 1042 497 1264 632 1330

Results per event (the 4 tlt electron finders are: Elec, Local, Sinistra and Emille).
condition	cal-slt*	cal_slt	tlt1	tlt2	tlt3	tlt4	flt iso-e	golden nc	exo nc 4
cal-slt electron	-	4679	1939	2808	2779	1418	4289	1068	1256
tlt1-electron	1938	1939	1943	1859	1909	1350	1942	693	695
tlt2-electron	2722	2808	1859	3000	2416	1357	2882	904	1045
tlt3-electron	2735	2779	1909	2416	2814	1387	2789	961	1042
tlt4-electron	1417	1418	1350	1357	1387	1421	1418	487	497
tlt4-electron (prob>0.5)	-	1696	1572	1619	1660	1700	1697	612	629
flt iso-e	-	4289	1942	2882	2789	1418	5511	1156	1264
golden nc bit	-	1068	693	904	961	487	1156	1175	632
exo nc 4 bit	-	1256	695	1045	1042	497	1264	632	1330

To find out what the rates are in the input sample for the SLT, passthrough events were selected from the same run:

Results for 17786 passthrough events of the same run.
condition cal-slt tlt1 tlt2 tlt3 tlt4 flt iso-e golden nc exo nc 4

cal-slt electron 1436 76 209 122 47 1233 29 43

tlt1-electron 76 76 71 73 44 76 22 26

tlt2-electron 209 71 254 108 45 226 24 36

tlt3-electron 122 73 108 127 46 126 26 37

tlt4-electron 47 44 45 46 47 47 13 15

flt iso-e 1233 76 226 126 47 2651 31 46

golden nc bit 29 22 24 26 13 31 32 21

exo nc 4 bit 43 26 36 37 15 46 21 48

Results for 17786 passthrough events of the same run.
condition	cal-slt	tlt1	tlt2	tlt3	tlt4	flt iso-e	golden nc	exo nc 4
cal-slt electron	1436	76	209	122	47	1233	29	43
tlt1-electron	76	76	71	73	44	76	22	26
tlt2-electron	209	71	254	108	45	226	24	36
tlt3-electron	122	73	108	127	46	126	26	37
tlt4-electron	47	44	45	46	47	47	13	15
flt iso-e	1233	76	226	126	47	2651	31	46
golden nc bit	29	22	24	26	13	31	32	21
exo nc 4 bit	43	26	36	37	15	46	21	48

Plots for the DST events:

Cal-Slt electron energy vs. TLT Emille electron energy (tltelec(4)). The cal-slt electron had to be within 0.1 rad from the tlt electron. If no cal-slt electron was found, the cal-slt electron energy was set to 1 GeV.

Cal-Slt electron energy vs. TLT SINISTRA electron energy (tlt3):

Moreover, Cal-Slt electron energy vs. TLT ELEC (tlt1) and LOCAL (tlt2) electron energy.