[SBS_sim] g15 replay results

[Bogdan Wojtsekhowski]

Hi Ole,

I would like to check that you have these selection parameters
which Lubomir used (attached). More see in his report 1/22/2010.
I would like also to remind recommendation to made simple
event display. You can not miss hits at "0%" background.

> Hi folks,
>
> attached are two plots with the tracking efficiency and ghost track
> fraction of Evaristo's latest g15 replay. The replay was done with
> analyzing only the first 6 planes and so should be directly comparable to
> last week's results. Interesting points:
>
> 1) The tracking efficiency with 0% background is only ~78%.  This gives us
> a good handle on chasing an obvious bug in the reconstruction.
>
> 2) I get slightly higher tracking efficiencies than I got with g9-g14 for
> all background strengths except 100%.  For example, for 10% I get 72% vs.
> 65% before.  This is odd since nothing should have changed.
>
> 3) The 100% background run seems to have only ~3810 events.  We could use
> a little more statistics. Recently, I've been replaying 5000 events for
> each setting.
>
> Results as a function of number of planes will follow shortly.
>
> Regards,
> Ole
>
> PS: To reproduce these results, please check out the current software as
> follows:
>
> setenv CVS_RSH ssh
> cvs -d :ext:cvs.jlab.org:/group/halla/analysis/cvs co TreeSearch-GEM
>
> PPS: If you'd like to get regular updates on the SBS tracking simulations,
> please subscribe to this mailing list. You can do so via a web interface
> at JLab (see the signature for the link).
>
> --------------------------------------------
> Parameters (for reference/expert use):
>
> number replayed = 5000
>
> search_depth = 12
> 3d_ampcorr_maxmiss = 4
> 3d_ampcorr_nsigma = 0.18
> 3d_chi2_conflevel = 1e-6
> 3d_maxmiss = 4
> maxmiss  = 3
> maxpat   = 1000
> maxslope = 0.1
> chi2_conflevel = 1e-6
> xp.res       = 7e-5
> maxclustsiz  = 4
> adc.min      = 200
> split.frac   = 0.1
> maxhits      = 1000
> maxsamp      = 3
> adc.sigma    = 0.2
>
>
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>


-- 
Bogdan Wojtsekhowski
TJNAF, 757-269-7191
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