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As Sho mentioned, the decay length I applied, which did not take the boost into account, would make the actual decay length much larger than intended. It would probably be best to test the procedure with known
(short) decay lengths to ensure that things actually pass through the SVT. I tried some mock data (mentioned in the track-assigning problem some time ago) and it had the same behavior, but you should also probably use your own, as opposed to tm_17mm as it
currently is.
-Brad
Here’s a dump of the header and first event in the stdhep file.
The electron and positron from pdgid=622 do have a displaced vertex.
====== File Header ===========
total blocks: 848
version: 2.01
title: tm_17mm.stdhep
comment: No comment
date: Sat Mar 28 13:43:27 2015
closing date: Sat Mar 28 13:43:27 2015
expected events: 1000
events: 4593
firstTable: -1
dimTable: 100
nNTuples: 0
nBlocks: 8
block names:
: Standard HEP COMMON block, see STDHEP Product
: Standard HEP COMMON block with multiple interaction, see STDHEP Product
: Stdhep begin run record, see STDHEP Product
: Stdhep end run record, see STDHEP Product
: Standard HEP COMMON block with Les Houches, see STDHEP Product
: Standard HEP COMMON block with Les Houches and multiple interaction
: Les Houches HEPEUP common block
: Les Houches HEPRUP common block
=============================
event has 6 particles
Track: 0, id: 11, vtx: (0, 0, 0, 0), mom: (0, 0, 6.6, 6.6, 0.0005111)
Track: 0, mother1: 0, mother2: 0, daughter1: 3, daughter2: 6, status: 3
Track: 1, id: -623, vtx: (0, 0, 0, 0), mom: (0, 0, 7.56373e-012, 171.24, 171.24)
Track: 1, mother1: 0, mother2: 0, daughter1: 3, daughter2: 6, status: 3
Track: 2, id: 622, vtx: (0, 0, 0, 0), mom: (0.03307, 0.0049935, 6.03357, 6.03736, 0.211)
Track: 2, mother1: 1, mother2: 2, daughter1: 4, daughter2: 5, status: 2
Track: 3, id: -11, vtx: (0.44637, 0.067401, 81.4396, 0), mom: (0.0372964, -0.063853, 5.30674, 5.30725, 0.0005111)
Track: 3, mother1: 3, mother2: 3, daughter1: 0, daughter2: 0, status: 1
Track: 4, id: 11, vtx: (0.44637, 0.067401, 81.4396, 0), mom: (-0.00422642, 0.0688465, 0.726836, 0.730102, 0.0005111)
Track: 4, mother1: 3, mother2: 3, daughter1: 0, daughter2: 0, status: 1
Track: 5, id: 11, vtx: (0, 0, 0, 0), mom: (-0.00857002, 0.0259785, 0.561974, 0.56264, 0.0005111)
Track: 5, mother1: 1, mother2: 2, daughter1: 0, daughter2: 0, status: 1
Here’s the output from slic:
And the start positions are all (0,0,0).
I’ll continue to investigate.
Norman
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