[G12] Minutes from 03/3/10 meeting

[Dennis Weygand]

If I understand you correctly , this now is in agreement with my back-of-the-envelope estimate:

5X10^7 photons/sec X 40 days X 24 hours/day X 3600 sec/hour = 1.7X10^14

Dennis


On Mar 3, 2010, at 3:39 PM, Diane Schott wrote:

> Hi Guys,
> 
> I made a slight mistake in the meeting, using the first couple hundred
> files I estimated about 1.947e14 (not the 1.947e16 I said in the meeting)
> photons over the entire data set.
> 
> Sorry,
> Diane
> 
>> Hi folks,
>>  Minutes from today's meeting can be found at:
>> 
>> http://clasweb.jlab.org/rungroups/g12/wiki/index.php/03Mar10
>> 
>> and pasted below:
>> 
>> Agenda
>> 
>>    * gflux
>>    * cascades
>>    * momentum corrections
>>    * gagik's missing tracks
>>    * Sasha Starostin's cascade analysis (bottom of the page)
>>    * Mike's latest fit to the rho
>> 
>> [edit]
>> Minutes
>> 
>>    * Attending: Sasha S., John P., Miles, Dennis, Diane, Heghine, Carlos,
>> Will, Craig, Paul, Sasha O., Mukesh, Ben, Michael Paolone, Lei
>>    * Diane is gonna run gflux on all of the g12 raw files -- they are
>> quick jobs but the files need to be pulled down off the silo.
>>    * Sasha is trying to reconcile with reality his numbers for the number
>> of photons with g12 -- Diane will send him a few of her files so he
>> can check. The number should be on the order of 1e14.
>>    * Johann reports that he's getting a mass for the ground state cascade
>> 15 MeV higher than the PDG mass. The data is 3 MeV off. Johann is
>> going to check that gsim uses the correct magnetic field for swimming
>> tracks. The MAGSCALE parameter in the gsim ffread card might be the
>> culprit -- we've been using 0.502 when perhaps 0.5 is the correct
>> number. He also will check which run number he's using to grab the
>> parameters from the DB. a1c also needs the -X option to reconstruct
>> gsim data correctly.
>>    * Johann will also provide Craig with some p pi+pi- MC so he can
>> kinematically fit it and get a look at the pull distributions.
>>    * Heghine is going to rework the momentum corrections with better
>> selections on exclusive events. The pions should have no background
>> when they are treated as the missing particle.
>>    * Ben would like Sasha S. to give a spectroscopy working group talk at
>> the upcoming collaboration meeting. Paul would also like Johann to
>> give an update on g12 status. Sasha S. seems to be doing the same
>> analysis as Johann but he has a different interest in the results,
>> namely to push forward a different proposal. The selections Sasha S.
>> was making on his data were unclear to the group and we would like to
>> postpone a talk until we can agree on the results. Paul suggests with
>> getting together with Sasha S. during the collaboration meeting and
>> prior to the SWG meeting to get to a group consensus.
>> 
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> 
> 
> -- 
> 
> 
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--
Dennis Weygand
weygand at jlab.org
(757) 269-5926