[Clas_hadron] [G14_run] Draft slides for my talk on NSTAR2013

[Igor Strakovsky]

Thank you, Eugene, for your clarification.  Now it works (more or less) for
me

Cheers, Igor

On Tue, 21 May 2013 10:16:02 -0400 (EDT), Eugene Pasyuk <pasyuk at jlab.org> 
wrote:

> Igor,
> 
> Coplanarity cut and missing proton (spectator) momentum cut are used for 
>"quasi-free" reaction selection. pi- threshold is to large extent irrelevant 
>for selection of "quasi-free" events. It only affects accessible kinematic 
>range. Nobody argues that these cuts do not remove all FSI. 
> 
> -Eugene
> 
> ----- Original Message -----
>> From: "Igor Strakovsky" <igor at va.gwu.edu>
>> To: "Eugene Pasyuk" <pasyuk at jlab.org>
>> Cc: "g14 run" <g14_run at jlab.org>, "CLAS Hadron Spectroscopy" 
>><clas_hadron at jlab.org>
>> Sent: Tuesday, May 21, 2013 9:45:54 AM
>> Subject: Re: [Clas_hadron] [G14_run] Draft slides for my talk on NSTAR2013
>> 
>> Eugene,
>> 
>> If g14 analysis is using pi- to get gn-->pi-p from gd-->pi-pp then it
>> is difficult task but that is doable for specific kinematics.
>>  Meanwhile
>> there is a cut-of for charged pions as well, say 100 MeV/c - please
>> correct if I am wrong
>> 
>> igor
>> 
>> 
>> On Tue, 21 May 2013 09:30:41 -0400 (EDT), Eugene Pasyuk
>> <pasyuk at jlab.org>
>> wrote:
>> 
>> > Igor,
>> > 
>> > Your statement about threshold for proton would be correct if we
>> > would
>> >attempt to detect spectator proton.
>> > We don't do that, spectator is reconstructed as a missing particle.
>> > For
>> >missing particle there is no threshold problem. If you look at the
>> >spectrum
>> >you will see it starts at 0.
>> > 
>> > -Eugene
>> > 
>> > ----- Original Message -----
>> >> From: "Igor Strakovsky" <igor at va.gwu.edu>
>> >> To: "Reinhard Schumacher" <schumacher at cmu.edu>, "Tsuneo Kageya"
>> >><kageya at jlab.org>
>> >> Cc: "g14 run" <g14_run at jlab.org>, "CLAS Hadron Spectroscopy"
>> >><clas_hadron at jlab.org>
>> >> Sent: Tuesday, May 21, 2013 9:25:23 AM
>> >> Subject: Re: [G14_run] Draft slides for my talk on NSTAR2013
>> >> 
>> >> Dear Reinhard,
>> >> 
>> >> I am afraid to try to correct you but the "select quasi-free
>> >> neutrons"
>> >> condition is not possible for CLAS.  CLAS cannot make a deal with
>> >> proton
>> >> with p < 200 MeV/c - there is a cut-off.  The 'quasi-free neutron'
>> >> term
>> >> is applying to the protons for p = 50 MeV/c or less.
>> >> 
>> >> Best, Igor
>> >> 
>> >> On Tue, 21 May 2013 09:18:49 -0400, Reinhard Schumacher
>> >> <schumacher at cmu.edu>
>> >> wrote:
>> >> 
>> >> > Hello Tsuneo,
>> >> > 	I took a look at your slides for NSTAR2013 and have a few
>> >> > 	suggestions
>> >> > about them.  Overall, they look to be in good shape.
>> >> > 
>> >> > Slide 11:  the position of the coplanarity cuts seems quite
>> >> > arbitrary.
>> >> > I would ask:  how does the result change if you double the width
>> >> > of
>> >> > the cut?
>> >> > 
>> >> > Slide 13: For this slide you state the energy range as 1.1 to
>> >> > 1.3,
>> >> > whereas the previous two slides had 0.7 to 1.3.  For
>> >> > consistency,
>> >> > maybe
>> >> > keep the energy range the same?  Also, on this slide you have
>> >> > the
>> >> > phrase
>> >> > "excludes bound neutrons".  This is needlessly obscure and not
>> >> > strictly
>> >> > correct.  Maybe you want to say "select quasi-free neutrons"
>> >> > 
>> >> > Have a great trip.
>> >> > 
>> >> > Reinhard.
>> >> > 
>> >> > ___________________________________________________________________
>> >> > Reinhard Schumacher         Department of Physics, 5000 Forbes
>> >> > Ave.
>> >> > Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.
>> >> > phone: 412-268-5177         web: www-meg.phys.cmu.edu/~schumach
>> >> > ___________________________________________________________________
>> >> > 
>> >> > On 05/20/2013 11:12 PM, Tsuneo Kageya wrote:
>> >> >> Hi,
>> >> >>
>> >> >>   I would like to get some comments and suggestions for my
>> >> >>   slides
>> >> >>   on
>> >> >>NSTAR2013.
>> >> >> My talk is related to the preliminary double spin asymmetries
>> >> >> on
>> >> >> g14
>> >> >>experiments.
>> >> >> I have 20 minutes including the discussion.
>> >> >> I got comments from Volker and others when I showed slides and
>> >> >> tried talking
>> >> >>about this this Monday.
>> >> >> I modified based on their comments, but I have still homework
>> >> >> to
>> >> >> do; page
>> >> >>10, need to show the graph
>> >> >> with colors.   Most of others have been changed.
>> >> >>
>> >> >>   Some of you may have different aspects; please let me know,
>> >> >>   if
>> >> >>   you have
>> >> >>comments.
>> >> >> A pdf file is attached.
>> >> >>
>> >> >>         Regards, Tsuneo Kageya.