[Halld-cal] Newer plots

[Mark Macrae Dalton]

Hi all,

The measured attenuation length should be used in the simulation and in the MC reconstruction.  The average of what is measured is 525 cm.  https://logbooks.jlab.org/entry/3316347 <https://logbooks.jlab.org/entry/3316347>

Best,
Mark Macrae Dalton

--
Staff Scientist, Jefferson Lab
office: +1 757 269 6931
mobile: +1 757 849 2929

> On Jun 4, 2015, at 7:31 PM, wmcginle at andrew.cmu.edu wrote:
> 
> Hi all,
> 
> Some time ago Alex Somov was simulating a photon gun at different angles
> and noticed the bcal cluster energy mean was a function of thrown angle
> and Sean made a fix so that the reconstructed cluster energy didn't depend
> on the thrown angle. When that happened I changed the mc variation
> attenuation lengths from 300 to 310 to set the cluster energy
> distributions where we wanted them.  I did not change it in the mc_parms,
> sorry about that.
> 
> Will
> 
>> Hi all,
>> 
>> I've analyzed some bggen data I made for a different study, and found
>> similar results to Tegan's [see attached BCAL_inv_mass-mc-cluster.pdf  and
>> BCAL_inv_mass-mc-shower.pdf].  An un-expert look at the reconstruction
>> code suggests that the attenuation lengths are used in the energy
>> reconstruction and these are indeed different for data and MC.
>> 
>> There might be a mismatch in the values of the attenuation lengths used in
>> the simulation, and reconstruction, though.  When I look at BCAL/mc_parms,
>> I find the parameter ATTEN_LENGTH = 300.  When I look at the mc variation
>> of BCAL/attenuation_parameters, I find the lengths for each channel are
>> set
>> to 310.  Probably these should be set to the same value?
>> 
>> Another discrepancy I noticed was that the efficiency in each layer
>> calculated with Elton's BCAL_Eff plugin was different for MC and data.
>> For
>> example:
>> - Data Run 2931 - bcal_hist_eff-run3185.png
>> - MC - bcal_hist_eff-mc.png
>> I'm not sure if the smaller efficiency in MC is related to problems
>> reconstructing certain BCAL points, or other issues with the clusterizer..
>> 
>> Cheers,
>> Sean
>> 
>> On Thu, Jun 4, 2015 at 2:47 PM beattite <beattite at uregina.ca> wrote:
>> 
>>> Hello.
>>> 
>>> Here are the mcsmear comparison plots using the variation=mc variable.
>>> There are two files.  One is the mass spectra using cluster energies,
>>> the other is using shower energies.
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> 
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