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

Tue May 21 10:16:02 EDT 2013

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.
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> _______________________________________________
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> >> 
> >> Igor Strakovsky, SAID CNS The George Washington University
> >> Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
> >> Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org
> >> _______________________________________________
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> 
> Igor Strakovsky, SAID CNS The George Washington University
> Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
> Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org
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