Re: More on BCAL energy deposition

[beni zihlmann <bzihlman@indiana.edu>]

Hi Alex,
when you do the analytical calculation you are assuming that the shower 
starts
right at the beginning of layer 1. correct? In the simulation the shower 
will
begin usually inside layer one or even deeper. This might be one of the 
reasons for
the discrepancy.

cheers,
Beni

Alex Dzierba wrote:
> Hi All
>
> Please see the attached.  In this note I show calculations of BCAL
> energy loss per layer as calculated using the analytical form for
> longitudinal energy profile, under different assumptions about
> the critical energy and Pb/SciFi matrix radiation length and comparing
> these with Blake's GEANT-based simulations at 90 degree and
> 40 degrees incidence.  At 90 degrees incidence it does not seem
> possible to simultaneously get good agreement between analytical
> and simulations for layers 1 and 2.  Perhaps it is important to
> take into account the transverse shape of the shower.  The latter
> information is probably even more critical in extending the analytical
> results to 40 degrees incidence.  The goal, of course, is to validate
> the simulations and then use information on the expected deposition
> per layer as a constraint in the calibration.
>
> I understand that Zisis is re-calculating the effective radiation
> length for the matrix.
>
> Cheers
> Alex

-- 

B. Zihlmann
Indiana University
Physics Department
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Bloomington, IN 47405
phone: (812) 855 6973
Fax:   (812) 855-5533