[G12] similar study of eloss in g11

[Craig Bookwalter]

I don't recall a conclusive answer as to whether or not GSIM data 
requires eloss to be applied (see attached).


On 09/13/2011 02:41 PM, Lei Guo wrote:
> HI, Craig,
>
> Nathan Baltzell did a very comprehensive study of eloss for g11. What 
> I recall is that he uncovered quite a few mistakes here and there, 
> mostly on the gsim side,  by comparing the delta_P (momentum change) 
> as a function of various variables (vertex positions, theta, momentum, 
> etc) using both real data and simulation. I think you already have the 
> all the info now. It might be worthwhile now to make sure that we did 
> eloss correctly, by checking the delta_p's as a function of z, theta, 
> p, and it should be similar to what gsim has, if we are doing eloss 
> correctly.
>
> Personally, I still think the low mass might come from the shifted 
> electron beam energy.
>
> Lei
>
>
>
> On Sep 14, 2011, at 6:45 AM, Craig Bookwalter wrote:
>
>> Hi folks,
>>     I've posted a few more things to the wiki in relation to our
>> discussion Friday about the issues I'm having with energy loss and the
>> mass of the neutron being too low:
>>
>> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/Charged_3pi_event_selection#Neutron_Mass 
>>
>>
>> Specifically, Mike Paolone and I each did our own eloss corrections to a
>> common set of events and I find our corrections to be identical. In
>> addition, I've examined a sample of p pi+ pi- events and when I
>> reconstruct the proton via missing mass off the pi+pi-, I see a similar
>> underestimation of the mass of the proton.
>>
>> Feel free to ponder this til Friday, or respond now via the list if you
>> so desire. Any ideas are welcome.
>>
>> --cb
>>
>>
>> -- 
>> ------------------------------------------------------------------------- 
>>
>>  Craig Bookwalter            FSU Office:  (850) 644 3808
>>  Department of Physics            JLab Office: (757) 269 5465
>>  Florida State University        craigb at hadron.physics.fsu.edu
>>  Tallahasse, FL 32306            craigb at jlab.org
>>
>> "Tower, this is Ghostrider requesting a flyby."
>> ------------------------------------------------------------------------- 
>>
>>
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>
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-- 
-------------------------------------------------------------------------
  Craig Bookwalter			FSU Office:  (850) 644 3808
  Department of Physics			JLab Office: (757) 269 5465
  Florida State University		craigb at hadron.physics.fsu.edu
  Tallahasse, FL 32306			craigb at jlab.org		

"Tower, this is Ghostrider requesting a flyby."
-------------------------------------------------------------------------

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