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One question about tracking efficiency [message #10560] Wed, 21 April 2010 17:51 Go to previous message
Yutie Liang is currently offline  Yutie Liang
Messages: 12
Registered: April 2010
Location: Germany
occasional visitor
From: *physik.uni-giessen.de
Dear all,

I met one problem when I use the PandaRoot to do one simple study. The decay chain of my study is: Psi(3770) -> D+ D- ->(k- pi+ pi+)( k+ pi- pi-)
I simulated 10k signals, but only 300~400 events survived.
I think this efficiency is too low.

The following is the detailed infomation of one event from generator. TrackIDs of (k-, pi+, pi+, k+, pi-, pi-) are always (0,1,2,3,4,5). So, I use this trackID as PID in this study.

-----------------------------------------------------
0 9
N Id Ist M1 M2 DF DL px py pz E t x y z
0 40443 2 -1 -1 1 2 0.00000000 -0.00000000 6.57879835 7.58363969 0.00000000 0.00000000 0.00000000 0.00000
000
1 411 2 0 0 3 5 -0.02342460 -0.12417095 3.72753839 4.17190509 0.00000000 0.00000000 -0.00000000 0.000
00000
2 -411 2 0 0 6 8 0.02342460 0.12417095 2.85125996 3.41173460 0.00000000 0.00000000 -0.00000000 0.00000
000
3 -321 1 1 1 -1 -1 -0.41376210 0.45311777 0.95670547 1.23916104 6.38056669 -0.03582590 -0.18990870 5.700
94639
4 211 1 1 1 -1 -1 0.25929310 -0.57261601 2.59179905 2.67058498 6.38056669 -0.03582590 -0.18990870 5.700
94639
5 211 1 1 1 -1 -1 0.13104440 -0.00467271 0.17903387 0.26215907 6.38056669 -0.03582590 -0.18990870 5.700
94639
6 321 1 2 2 -1 -1 0.01936009 -0.00991458 0.09054525 0.50238581 1.18131702 0.00811080 0.04299434 0.98725
203
7 -211 1 2 2 -1 -1 0.24342156 0.42046406 1.79061469 1.86059797 1.18131702 0.00811080 0.04299434 0.987252
03
8 -211 1 2 2 -1 -1 -0.23935704 -0.28637852 0.97010002 1.04875082 1.18131702 0.00811080 0.04299434 0.9872
5203
---------------------------------------------------------------

I checked, and found that the tracking efficiency of (k-, pi+, pi+, k+, pi-, pi-) is only about 50~60%, when MC trackID' match is required. this low efficiency of each track could explain the low efficiency of this channel.
but, when I did single track study, the tracking efficiency of pi+ with MCtrackID match is close to 80%. This is also low, but still acceptable considering McID match.

It seems that when there are multiple tracks, 6 in my case, the tracking efficiency will become worse. Is this the problem?
I hope that's only one bug of my analysis.


Thanks


yutie
 
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