First results on 6M training sample and Bs->mumu analisys F. Crescioli, M. Dell'Orso, P....

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