[DIRC] dircprop

[hyde at jlab.org]

Jochen and Carsten,
Thank you for the answers.
A great deal of of the variation in performance we are finding
in drcprop comes from the simple fact that the number of produced
cherenkov photons scales as thickness/sin\theta.
However, multiple scattering will scale as the square root of the
same number, and may exceed 1 mr at the smallest angles we are considering.
As we understand better our lens performance, we will have to include
these effects as well.
Charles


> Dear Charles,
>
> Carsten should confirm or contradict but I believe that drcprop does not
> process the track, only handles ray tracing of the photons.
> If you're asking because of the question of total Cherenkov track
> resolution: the resolution defined as single photon resolution divided
> by sqrt(N) is the DIRC-only part of the resolution, the appropriate
> contribution from multiple scattering and tracking resolution need to be
> added (in quadrature) to get to the separation power performance.
> One of the reasons for pursuing Geant4 in parallel with drcprop is
> indeed the option to include tracking/multiple scattering as well as
> physics generators to simulate the particle and photon phase space.
>
> Cheers,
> 	Joe
>
> hyde at jlab.org wrote the following on 5/16/2013 16:54:
>> Carsten,
>> Does dircprop include multiple scattering of the primary charged
>> particle in the DIRC bar?
>>
>> Charles
>>
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