[g13] Still-Needed Analysis-Independent g13a Studies

[Paul Mattione]

Here are more details on:

6) Photon Flux Uncertainty: 
 - Page 74 (PDF page 84) of Mike Williams' thesis: http://www.jlab.org/Hall-B/general/thesis/williams_thesis.pdf

7) Target density measurement (who knows how out-of-date the DAQ online scripts are though, we may need to ask the online group where we can get this information):
 - Page 68 (PDF page 78) of Mike Williams' thesis: http://www.jlab.org/Hall-B/general/thesis/williams_thesis.pdf
 - CLAS-Note 2002-003: http://www.jlab.org/Hall-B/notes/clas_notes02/02-003.pdf

 - Paul

On Oct 17, 2012, at 4:39 PM, Paul Mattione wrote:

> Here is the list of the analysis-independent studies that still need to be performed on the g13a data set (excluding polarization studies, which USC is currently working on):
> 
> 1) TOF Track Reconstruction Efficiencies: Determine the efficiency of the TOF paddles.  This needs to be done in a phi-dependent manner (since PMTs on varying sides of the paddle have vastly varying strengths).  For coupled paddles 40-48 this needs to be done as a function of theta instead of scintillator # in order to decouple the paddles.  This is EXTREMELY important for minimum-ionizing particles at large angles (at the moment I have to cut all of paddles 40 - 48 in every sector from my analysis).  I will study this.  
> 
> 2) Determine the trigger efficiency as a function of theta in paddles 40-48 instead of paddle # (to decouple the paddles).  I will do this.  
> 
> 3) SC paddle cuts: come up with and apply a consistent metric for determining which SC paddles should be cut from cross section analyses (so far I just eye-balled it).  The difference between this and #1 is to cut any paddles with misaligned timing and/or mass peaks (will primarily be paddles 40-48).  This should also be used to cut paddles that are effectively completely dead.  
> 
> 4) Tagger counter cuts: Come up with and apply a consistent metric for determining which tagger counters (E & T) should be cut from cross section analyses (so far I just eye-balled it).  For this we should probably either use the flux-corrected track yields by counter, or use the tagging ratios that Chuck determined from the normalization runs.  
> 
> 5) Use PDU to determine the reconstruction efficiency of the DC.  Yordanka is getting in touch with Maurizio about this.  
> 
> 6) Determine the systematic uncertainty of the photon flux.  We can probably just do what other experiments have done for this (I can't remember off the top of my head).  
> 
> 7) Study the density of the target and the systematic uncertainty on it's value.  We can probably just do what other experiments have done for this (I can't remember off the top of my head).  
> 
> 8) Minimum momentum cuts: I'm currently cutting at 400 MeV/c for protons and 100 MeV/c for pions and kaons, but this probably needs to be looked into again and fine tuned.  I'm not sure what the best way is to do this yet.  
> 
> 9) Study the stability of the acceptance corrections: study the g, n -> p, p, pi- cross section as a function of run number to verify there are no problems (I will do this).  
> 
> Yikes!  Quite the long list.  That's why I need help!  I will do 1), 2), and 9).  I will probably end up doing/helping-with more of them, but the more help I can get the better ( 1) is going to be really hard...).  I don't think the other studies will be too involved (besides 5)): for example, I already sort-of did 3 & 4 but eye-balled them instead of coming up with a more rigorous standard.  
> 
> Please let me know what you think you can help with.  I'd like to get these studies done as soon as possible so that I (and others!) can start submitting our analyses for collaboration review.  Thanks!  
> 
> - Paul
> 
> 
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