[SBS_sim] Important Bug Fix on background sampling

[Evaristo Cisbani]

Dear Vahe,

thanks for the quick analysis.

Likely the algorithm of uncorrelated background hit suppression works
better, being the background signal has expected.

Evaristo


On Fri, 2011-05-20 at 09:17 -0400, Vahe Mamyan wrote:
> Hi Evaristo,
> 
> It looks like efficiency is higher with this mistake fixed. See
> attached file. 
> 
> Vahe
> 
> On Fri, May 20, 2011 at 6:08 AM, Evaristo Cisbani
> <evaristo.cisbani at iss.infn.it> wrote:
>         Dear All,
>         
>         Bogdan found a bug in the digitization: the background signal
>         is not
>         sampled correctly.
>         
>         The error is in the transformation of time coordinate, I used
>         for
>         sampling, that is:
>         
>          tT is the trigger time (that I assume 0)
>          t0 is the first sampling (e.g. -100 ns)
>          tH is the hit time (from -400 ns to 100 ns for background,
>         around 0 for
>         signal)
>         
>         The sampling time I used was: t=t0+tH, while the correct one
>         is: t=t0-tH
>         This affects the background but not the signal (being tH ~ 0).
>         
>         Unfortunately this may have impact on the results.
>         
>         I fixed the bug and ran digitization again for g20 and g21.
>         The new data
>         are posted in the usual directory (wrong data removed).
>         
>         http://www.iss.infn.it/cisbani/atmp/gemc/production/
>         
>         I apologize for the mistake!
>         
>         Evaristo
>         
>         
>         --
>          Evaristo Cisbani                      office : +39 06 4990
>         2847
>          Istituto Superiore di Sanita`         lab    : +39 06 4990
>         2347
>          Department of Technology and Health   fax    : +39 06 4990
>         2137
>          and Istituto Nazionale di Fisica Nucleare Roma - gruppo
>         Sanita`
>          via Regina Elena 299 - 00161 Rome     web    :
>         www.iss.infn.it/cisbani
>          Italy
>         ------------------------------------------------------------------------
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-- 
 Evaristo Cisbani                      office : +39 06 4990 2847 
 Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
 Department of Technology and Health   fax    : +39 06 4990 2137 
 and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
 via Regina Elena 299 - 00161 Rome     web    : www.iss.infn.it/cisbani
 Italy
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