[G8b_run] g8b meeting

[Philip L. Cole]

Thanks for the input, Michael.  I certainly did not wish to misrepresent
Patrick's good work.  So clearly I will be careful in the future to be
precise in my language. What is nice is that the results, as you will see,
agree very well with Patrick's work.  Clearly the analyses are predicated
on certain inalienable facts, such as having a pi+, pi-, and pi0 in the
final state, but the analysis chain will not be the same.  So with that
statement, Danny has verified the correctness of Patrick's work.  What we
at ISU wish to do is now pull out the spin density matrix elements and use
the Sigma as a constraint for a combination of the SDMEs.

Cheers,
Phil

>
> Phil,
>
> You should not state:
> "Danny uses a different method than Patrick.  He requires all that there
> be a proton, pi+ and pi- in the final state.  The pi0 is reconstructed
> through missing mass and then the invariant mass of the three pions are
> reconstructed."
>
> For one, Patrick's analysis also requires the exact same signature (p,
> pi+, pi-, and missing mass consistent with pi0). Also, you should not
> state "..the invariant mass of the three pions are reconstructed." When
> you state the reconstruction of the three pions, it is implied that you
> have four vectors for each particle separately determined, where in fact,
> the pi0 four-vector Danny creates is found by using all of the
> four-vectors from all of the other detected particles.
>
> Take care,
> Michael
>
>
> On Tue, 14 Jun 2011, Philip L. Cole wrote:
>
>>
>> All,
>>
>> I am sorry that I did not see the message until this morning, but Danny
>> and I will be traveling on Monday, June 20 to JLab and will not be able
>> to
>> participate in the g8b meeting as currently scheduled.
>>
>> Danny will be presenting on his work on extracting the Photon Asymmetry
>> Parameter at the CLAS collaboration and we were hoping to go over the
>> talk
>> before the meeting.  Is it possible for the meeting to be shifted to
>> Friday and if not, can we send the talk to all of you?  And then solicit
>> your comments.  I have shown the preliminary results to Franz.
>>
>> Danny uses a different method than Patrick.  He requires all that there
>> be
>> a proton, pi+ and pi- in the final state.  The pi0 is reconstructed
>> through missing mass and then the invariant mass of the three pions are
>> reconstructed.  The Sigma is extracted for the omegas using the
>> technique
>> delineated in Daria's thesis.  The standard azimuthal-fitting method.
>> The
>> extracted Sigmas agree well with Patrick's results.  The next step will
>> be
>> to extract the SDMEs.
>>
>> We will have the talk ready by Wednesday evening.
>>
>> Thanks for your patience.  I just did not look at my JLab e-mail
>> yesterday.
>>
>> Phil
>>
>>> Hi All,
>>> As you know I didn't want to have another meeting until there was
>>> something useful to say about beam polarization - or some other
>>> progress.
>>> I hope the new polarization tables will be ready within the next couple
>>> of days, with docmentation to follow immediately.
>>>
>>> Can we please have a meeting before the CLAS meeting. The thursday slot
>>> is now taken up by FROST. I've initiated a doodle poll.
>>> I cannot do any later than 5-6PM UK time, and I know the ASU folks
>>> don't
>>> want to get up at 4.00AM, so we're fairly restricted.
>>>
>>> Can you please fill up your availability.
>>>
>>> http://doodle.com/y7s3nyp85fdys7ai
>>>
>>>
>>> Cheers,
>>> Ken
>>>
>>> --
>>> =======================================================
>>> Ken Livingston
>>>
>>> Dept. of Physics&  Astronomy,        Tel: +44 141 330 6428
>>> University of Glasgow,               Fax: +44 141 330 5889
>>> Glasgow G12 8QQ.
>>> Scotland. UK.
>>> =======================================================
>>>
>>> _______________________________________________
>>> G8b_run mailing list
>>> G8b_run at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/g8b_run
>>>
>>
>>
>> --
>>   Philip L. Cole
>>   Associate Professor
>>   Idaho State University
>>   Department of Physics
>>   Pocatello, Idaho 83209
>>   (208) 282-5799  office
>>            -4649  fax
>>    cole at athena.physics.isu.edu
>>    http://www.physics.isu.edu/staff/cole.html
>>
>>
>>
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-- 
   Philip L. Cole
   Associate Professor
   Idaho State University
   Department of Physics
   Pocatello, Idaho 83209
   (208) 282-5799  office
            -4649  fax
    cole at athena.physics.isu.edu
    http://www.physics.isu.edu/staff/cole.html