[G8b_run] mom corr function and histos

[Franz Klein]

Ok, Ken. I'll do it. There are classes next week and I will be at Catholic 
on thursday at noon (I assume the time is still 12pm?!)

Franz

On Fri, 28 Aug 2009, Ken Livingston wrote:

> Hi Eugene, Mike,
> I think we should have the meeting if possible. Can anyone initiate it,
> or does it have to be done by someone from Jlab.
>
> Cheers,
> Ken
>
>
>
> Eugene Pasyuk wrote:
>> Mike et al.,
>>
>> I'll be out of the country next week. If you decide to have conference
>> call next week, then someone else will have to initiate the call.
>>
>> -Eugene
>>
>>
>> Michael Dugger wrote:
>>
>>> g8b run group,
>>>
>>> Chuck: Nice job :)
>>>
>>> The run group should come to an agreement as to the energy and momentum
>>> corrections. It would be best if we all used the same corrections and had
>>> some sort of documentation to point to.
>>>
>>> My feeling is that a kinematic fitting routine should give the best
>>> results for this sort of study. Since replacing the confidence level cut
>>> with a missing mass cut does not change the results in any real meaningful
>>> way, the selection of events due to confidence level does not appear to
>>> be very important in the end analysis. As long as the pull distributions
>>> look good, I feel comfortable going with Chuck's results.
>>>
>>> Assuming that I read the plots correctly, Chuck's results suggest that the
>>> photon energies in the range of interest (0.9 to 2.0 GeV) are within 0.3
>>> MeV ! If this is the case, we do not need to worry about the photon energy
>>> correction and we state the width of an eid as being the uncertainty in
>>> the photon energy.
>>>
>>> Question: Should meet next week to discuss this?
>>>
>>> Take care,
>>> Michael
>>>
>>> On Thu, 27 Aug 2009, Charles Hanretty wrote:
>>>
>>>
>>>> Hello all,
>>>>     Here is my momentum correction function and array again.  You can find
>>>> it at:
>>>> /u/home/hanretty/rootbeer2.1/NTuple_code/corrected_proton_mom.cc
>>>>
>>>> the array needed can be found at:
>>>> /u/home/hanretty/rootbeer2.1/NTuple_code/mom_corr_array.pro
>>>>
>>>> The function requires you to give it the proton's 4-vec as it
>>>> comes from the data file, no corrections should be made to this 4-vec
>>>> prior to the call to the function.  This 4-vec is used to find the correct
>>>> bin in momentum, theta, and phi and the appropiate correction factor.  The
>>>> function also needs a 3-vec vertex position and the run number.  The 3-vec
>>>> and run number are needed to apply the ELoss package to the 4-vector both
>>>> before the corrections are applied and after. This function does not
>>>> apply ELoss twice to the same 4-vector though.  ELoss is first applied to
>>>> the 4-vec so the binning can be determined.  The correction factors are
>>>> then applied to the (raw) 4-vec components and the momCorred 4-vec then
>>>> has ELoss applied to it.  The function then returns the corrected
>>>> 4-vec.
>>>>
>>>> I have also made some plots for tht tagger sag using a different
>>>> confidence level cut and also the suggested mm^2 cut.  The first of the
>>>> two plots I'd like to share show the taggerSag distributions using a conf
>>>> lvl cut of 10% and 0.1%. In the histo, the lower distribution comes from
>>>> using a conf lvl cut of 10% while the upper comes from using a conf lvl
>>>> cut of 0.1%.  The low points of the two distributions are almost the same
>>>> but the "humps" of the distribution using the lower conf lvl cut are more
>>>> pronounced:
>>>> http://hadron.physics.fsu.edu/~hanretty/Files/TaggerSag/EtrueMinusEmeas_v_Emeas_FitMeans_BothConfCuts.gif
>>>>
>>>> The second plot again has two taggerSag distributions.  The bottom one is
>>>> the original dist (the one using a conf lvl cut of 10%) and the top one is
>>>> the distribution made using the mm^2 cuts that were suggested by Mike.
>>>> The effect of this mm^2 cut is almost exactly the same as the effect from
>>>> making a conf lvl cut of 0.1%:
>>>> http://hadron.physics.fsu.edu/~hanretty/Files/TaggerSag/EtrueMinusEmeas_v_Emeas_ConfCutAndMM2Cut.gif
>>>>
>>>> -Chuck
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>>>>
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>
>
> -- 
> =======================================================
> Ken Livingston
>
> Dept. of Physics & Astronomy,        Tel: +44 141 330 6428
> University of Glasgow,               Fax: +44 141 330 5889
> Glasgow G12 8QQ.
> Scotland. UK.
> =======================================================
>
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===============================================================
                   Franz J. Klein, Associate Professor
                   CUA, Department of Physics
                   Washington, DC 20064
   office: Hannan Hall 206          phone: 202-319-6190
   or: Jefferson Lab,CC F-243       phone: 757-269-6671
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