[SBS_sim] g15 replay results

[Ole Hansen]

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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