Embed Size (px)
Citation preview
First results on 6M training sample and Bs->mumu analisys
F. Crescioli, M. Dell'Orso, P. Giannetti, G. Punzi, G. Volpi
23/01/2007 Francesco Crescioli 2
Sample and programs
Training sample 6M evts by Erik (12.0.31)
Bs->mumu sample 27k evts by Erik (12.0.31)
All samples with ATLAS-CSC-01-02-00 geom
ftksim with RW and HW enabled, variable plane layout
Old plane conf: 2 Pixel Layers (1st and 2nd) - 4 SCT Layers
New plane conf: 3 Pixels Layers - 3 SCT Layers (1st, 3rd , 4th)
ftksim_comp (matching program) with loose match requirements for phi and ctheta
23/01/2007 Francesco Crescioli 3
Training results
~61k sectors with constants
~160k patterns per bank (8 banks)
Overall efficiency ~50% (computed on bs->mumu sample)
Checks on training gives results similar to v10, BUT:
Better impact parameter 5/6 resolution with 3 Pixel 3 SCTs layer setup
Sligth asymmetry on resolution shapes (expecially ctheta) in 5/6 mode. To be investigated.
23/01/2007 Francesco Crescioli 4
Bs->mumu fake analisys - cuts
Asym in ctheta distance.To be investigated.
Distance from the nearest truth.
Log scale.
C phi
ctheta z0
23/01/2007 Francesco Crescioli 5
Bs->mumu fake analisys - chi2Old layer configuration
New layer configuration
23/01/2007 Francesco Crescioli 6
Bs->mumu fake analisysimpact param distribution
Old Layer configuration
New Layer configuration
23/01/2007 Francesco Crescioli 7
Bs->mumu fake analisysimpact param distribution (mu)
Old Layer configuration
New Layer configuration
23/01/2007 Francesco Crescioli 8
Bs->mumu fake analisysimpact param resolution
Old Layer configuration
New Layer configuration
23/01/2007 Francesco Crescioli 9
Bs->mumu fake analisysimpact param /non- (good)
Old Layer configuration
New Layer configuration
23/01/2007 Francesco Crescioli 10
Bs->mumu fake analisysimpact param /non- (fake)
Old Layer configuration
New Layer configuration
23/01/2007 Francesco Crescioli 11
Truth problems?
Bs->mumu sample: some tracks have vertex exactly (0,0,0) in the truth
Mostly pi and protons, never muons
Training sample: no tracks have exactly (0,0,0)
Precision problem?
jobOption problem?
Is it a problem?
23/01/2007 Francesco Crescioli 12
Bs->mumu fake analisysimpact param distribution (no
0)All tracks.
New Layer configuration
Non zero impact parameter.
New Layer configuration
IP distribution is larger, because it's rich in muons
23/01/2007 Francesco Crescioli 13
Bs->mumu fake analisysimpact param resolution (no 0)
All tracks
New plane configuration
Non zero impact parameter
New plane configuration
Resolution are slightly better with the non-zero impact parameter sample
23/01/2007 Francesco Crescioli 14
Good/Fake missplane distr
Old plane configuration
New plane configuration
23/01/2007 Francesco Crescioli 15
Conclusion
Version 12.0.31 training data seems ok
First results on Bs->mumu sample highlight improvement with new plane configuration
Fake tracks are now mostly real tracks with few parameters reconstructed bad
Impact parameter seems to be better measured
We should repeat analisys on Wuu/Wbb sample
Investigate minor strange things (zero impact parameter tracks, ctheta asymmetries, ...)
23/01/2007 Francesco Crescioli 16
BACKUP
23/01/2007 Francesco Crescioli 17
Fake failed parameter distr
Old plane configuration
New plane configuration
23/01/2007 Francesco Crescioli 18
Fake missplane/parameter distr
Old plane configuration
New plane configuration
23/01/2007 Francesco Crescioli 19
Good/Ghost/Fake
Old plane configuration
New plane configuration
