[G12] Proton, Electron, Positron, Photon acceptance

[Michael C. Kunkel]

On 7/31/12 5:26 PM, mpaolone at jlab.org wrote:
> Ken,
>
> The dip is something that comes from lepton-selection process in the
> center of the sector.  It's either due to a reduced cherenkov efficiency
> there, or/and a poorer pion/lepton separation.  I have some plots showing
> this, but they are on my other computer which is still packed from the
> move.  I'll post them as soon as I am up and running.
>
> What's more bothersome to me, is that the dip isn't represented in the data.
>
> Also MK,
>
> It looks like your MC beam distribution is not Bremsstrahlung.  Are you
> generating your beam as 1/E?  You could try to weight your events to make
> the MC and the data beam energy match, and see how that affects your
> proton (and t) distributions.
>
> -Michael
>
>
>> MK,
>>
>> Why do you have a dip in the middle of each sector for the plot labeled
>> "phi of e+" on page 1?  (Similar for the e- on page 2).  This doesn't look
>> correct.  What happens if you don't do the preliminary cut on leptons?
>>
>> Ken
>>
>>
>> -----Original Message-----
>> From: g12-bounces at jlab.org [mailto:g12-bounces at jlab.org] On Behalf Of
>> Michael C. Kunkel
>> Sent: Tuesday, July 31, 2012 4:12 PM
>> To: g12
>> Subject: [G12] Proton, Electron, Positron, Photon acceptance
>>
>> Greetings G12,
>>
>> I seem to having issues with my acceptance and would appreciate comments.
>> Please refer to the link
>> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/PEpEmGamPhase_Acceptance#Tuesday_July_31.2C_2012
>> where I have plots showing acceptance plots. The issue I am having is in
>> the proton and beam acceptance, which does not match the data, however the
>> e+e-gamma acceptance does.
>>
>> I generate my beam spectrum with a 1/e function and before I send into
>> gsim I do a preliminary cut on the leptons/photons to be kinematic angles
>> of the EC/CC. This cut is what distorts my proton, beam and t spectrum.
>>
>> Any thoughts on why?
>>
>> Thanks
>> MK
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Thanks Mike,

I do generate with a 1/E bremstrahlung profile, however when I make the 
preliminary cuts for the leptons/final photon, this 1/E spectrum does 
not survive. This was my original question in the first email as to why 
this 1/E spectrum would distort my spectrum.

MK