residual studies

RESIDUAL STUDIES

ANALISYS UNDER DIFFERENT SITUATIONS

13/05/2008 1Simone Brusa, INFN-Ferrara

Residual comparison between old ntupla (TOTdebug3.root, gauss v25r12) and new geometry new gauss (v30r4) just first pad selected (M2-M3 are rebinned 4 also in the next slides)

13/05/2008 Simone Brusa, INFN-Ferrara 2

OLD

NEW

COMPARISON BETWEEN OLD NTUPLA GAUSS V25R12 & THE SAME NTUPLA REPROCESSED USING THE LAST VERSION OF

AllineaBrunel (not big pad)

29/04/2008 Simone Brusa, INFN sezione di Ferrara 3

OLD

REPR

OC

ESSED

What is it changed?Did we changed the selection Algorithm?

Brunel ntupla reprocessed with last version of root`s macro, no big pad.

Old digi reprocessed under new Brunel version (v32r1), same root`s macro

13/05/2008 Simone Brusa, INFN-Ferrara 4

Response: no!

Selected just the first pad for both.

13/05/2008 Simone Brusa, INFN-Ferrara 5

From the previous slides. we can see that the results obtained using the last version of AllineBrunelCTalk, are comparable.It`s even better than before, remember that we are using the right pad size (different from TDR) and a new binning.

Now the question is:why the residual distributions are so bad now?It depends on the geometry?No (see the plot)!

OLD GEOMETRY, NEW GAUSS V30R4

New geometry, old Gauss v25r12, just first pad selected

13/05/2008 Simone Brusa, INFN-Ferrara 6

BOTH NEW GEOMETRY & FIRST PAD SELETCTED GAUSS V25R12 GAUSS V30R4

13/05/2008 Simone Brusa, INFN-Ferrara 7

They are comparable!B is on for both! Is it the source of the problem?

RESUMING TABLEB field Geomet

ryGauss Boole Brunel Root `s

macroResults Slide #

On New New New New New Bad M4 2

On Old New New New New Bad M4 5

Off Old Old Old Old From Saint Nectaire

OK 2

Off Old Old Old Old New OK 3

Off Old Old Old New New OK 4

On New Old Old Old New Bad M4 6

Off New New New New New Ok Next slide

13/05/2008 Simone Brusa, INFN-Ferrara 8

New geometry, new Gauss, Boole & Brunel, just first pad selected & Boff (172k muon

tracks reconstructed)

13/05/2008 Simone Brusa, INFN-Ferrara 9

Conclusions & to do 1/2• Seems that the source of our problem is a bad

pattern recognition with the magnetic field on.• The selection used is just the first pad;• Respect to the last report, I found a my mistake

in the code and the Z correction doesn`t remove the jumps in the Xpad-XMChit distribution between adjacent rows & columns of chambers

• I would to check the results one more time in order to guarantee them.

13/05/2008 Simone Brusa, INFN-Ferrara 10

Conclusions & to do 2/2

• Next step will be run Brunel setting properly the flag B field to false (should not change the results);I already submit the jobs;

• Remove the cut on the mchits inside the pads;• Modify the pattern recognition algorithm to work

properly also with B on;• Do you have any suggestion?(example look at the

center of the B field instead on IP, …)

13/05/2008 Simone Brusa, INFN-Ferrara 11