[Clas_hadron] abstracts for DNP

Bill Briscoe briscoe at gwu.edu
Fri Jun 28 17:10:30 EDT 2013 

Go for it! Sounds good.

BB

On Fri, Jun 28, 2013 at 7:09 PM, Viktor Mokeev <mokeev at jlab.org> wrote:

>  I support this suggestion.
>
>  Best Regards,
>                   Victor
>
> ----- Original Message -----
> From: "Michael Dugger" <dugger at jlab.org>
> To: "Barry Ritchie" <Barry.Ritchie at asu.edu>
> Cc: "Viktor Mokeev" <mokeev at jlab.org>, "Michael Dugger" <
> michael.dugger at asu.edu>, "Eugene Pasyuk" <pasyuk at jlab.org>, "clas hadron"
> <clas_hadron at jlab.org>
> Sent: Friday, June 28, 2013 1:06:21 PM
> Subject: Re: [Clas_hadron] abstracts for DNP
>
>
> Hi,
>
> That makes it nice and clear. Sounds good to me.
>
> Take care,
> Michael
>
> On Fri, 28 Jun 2013, Barry Ritchie wrote:
>
> > So maybe it would be better to go ahead and have the opening sentence
> speak about "exclusive eta photoproduction on the proton", which then would
> not need the qualifier about "one-step excitation". "Generic" eta
> photoproduction can be inclusive, so saying exclusive cleans that up. As
> Mike indicates, we only discuss exclusive production in the abstract.
> >
> > Barry G. Ritchie
> > Vice Provost for Academic Personnel
> > Arizona State University
> > 300 E. University Ave, Suite 420
> > Tempe, AZ 85287-7805
> >
> > Phone: 480-965-7405
> > Fax: 480-965-0785
> >
> >
> > -----Original Message-----
> > From: Viktor Mokeev [mailto:mokeev at jlab.org]
> > Sent: Friday, June 28, 2013 9:43 AM
> > To: Barry Ritchie
> > Cc: clas hadron; Michael Dugger; Eugene Pasyuk
> > Subject: Re: [Clas_hadron] abstracts for DNP
> >
> >  Dear Barry,
> >
> > It is true, but this problem should be resolved in the selection of
> exclusive events and related corrections for exclusive cross sections
> should be incorporated.
> >
> >  Best Regards,
> >                         Victor
> >
> > ----- Original Message -----
> > From: "Barry Ritchie" <Barry.Ritchie at asu.edu>
> > To: "Michael Dugger" <michael.dugger at asu.edu>, "Eugene Pasyuk" <
> pasyuk at jlab.org>
> > Cc: "clas hadron" <clas_hadron at jlab.org>
> > Sent: Friday, June 28, 2013 12:33:20 PM
> > Subject: Re: [Clas_hadron] abstracts for DNP
> >
> > But we could have an undetected pion flying around, though, in the 2pi
> steradians CLAS doesn't cover.
> >
> > Barry G. Ritchie
> > Vice Provost for Academic Personnel
> > Arizona State University
> > 300 E. University Ave, Suite 420
> > Tempe, AZ 85287-7805
> >
> > Phone: 480-965-7405
> > Fax: 480-965-0785
> >
> >
> > -----Original Message-----
> > From: clas_hadron-bounces at jlab.org [mailto:clas_hadron-bounces at jlab.org]
> On Behalf Of Michael Dugger
> > Sent: Friday, June 28, 2013 9:26 AM
> > To: Eugene Pasyuk
> > Cc: clas hadron
> > Subject: Re: [Clas_hadron] abstracts for DNP
> >
> >
> > Hi,
> >
> > Since we have the final state as
> > p eta,
> > we can't have an extra pion flying about. We can probably safely remove
> the "in one-step excitation processes" part.
> >
> > Take care,
> > Michael
> >
> > On Fri, 28 Jun 2013, Eugene Pasyuk wrote:
> >
> >> Igor,
> >>
> >> As alternative to single step you may say that N\eta final state cannot
> be directly coupled to \Delta resonances.
> >>
> >> -Eugene
> >>
> >> ----- Original Message -----
> >>> From: "Igor Senderovich" <senderov at jlab.org>
> >>> To: "Viktor Mokeev" <mokeev at jlab.org>
> >>> Cc: "clas hadron" <clas_hadron at jlab.org>
> >>> Sent: Friday, June 28, 2013 5:07:33 PM
> >>> Subject: Re: [Clas_hadron] abstracts for DNP
> >>>
> >>> Dear Viktor,
> >>>
> >>> What I would call a two-step process is one in which the state
> >>> de-excites via two emissions - say Delta excitation decaying with
> >>> pion emission to an N* which then emits an eta. This illustrates a
> >>> case when detection of an eta would not offer isospin filtering. I am
> >>> just being careful to avoid such a counterexample to my statement.
> >>>
> >>> All the best,
> >>> -Igor
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Viktor Mokeev" <mokeev at jlab.org>
> >>> To: "Igor Senderovich" <senderov at jlab.org>
> >>> Cc: "clas hadron" <clas_hadron at jlab.org>
> >>> Sent: Thursday, June 27, 2013 4:55:15 PM
> >>> Subject: Re: [Clas_hadron] abstracts for DNP
> >>>
> >>>   Dear Igor,
> >>>
> >>>  You abstracts look good.
> >>>
> >>>  Could you explain what you mean by one-step excitation processes?
> >>>
> >>>  Best Regards,
> >>>                       Victor
> >>>
> >>> ----- Original Message -----
> >>> From: "Igor Senderovich" <senderov at jlab.org>
> >>> To: "clas hadron" <clas_hadron at jlab.org>
> >>> Sent: Thursday, June 27, 2013 11:30:15 AM
> >>> Subject: [Clas_hadron] abstracts for DNP
> >>>
> >>> Dear Colleagues,
> >>>
> >>> I would like to submit the two abstracts that follow this e-mail for
> >>> the meeting of the DNP and appreciate any feedback you can offer.
> >>> Best regards,
> >>> -Igor Senderovich
> >>>
> >>> ----------
> >>> For the mini-symposium (14e. Mini-Symposium on the Excited Nucleon
> >>> State Spectrum and Structure):
> >>> Title: Studies of $\eta$ photo-production in the baryon resonance
> >>> excitation region with CLAS
> >>> Abstract:
> >>> Because the pseudoscalar $\eta$ meson has zero isospin, $\eta$
> >>> photo-production offers the feature of isolating N* (I=1/2) resonance
> >>> states in one-step excitation processes. This ``isospin''
> >>> filter property can be very useful in helping disentangle the broad
> >>> and overlapping excitations that make up the nucleon resonance
> >>> spectrum. For that reason, a program of measurements on $\eta$
> >>> photo-production for the reaction $\gamma p \rightarrow \eta p$ has
> >>> been conducted using the Hall B CEBAF Large Acceptance Spectrometer
> >>> at Jefferson Lab. Results for the differential cross-section and for
> >>> single- and double-polarization observables will be summarized. The
> >>> general outlook for the ``complete experiment'' program for
> >>> disentangling nucleon resonances decaying to the $p \eta$ channel
> >>> will be discussed.
> >>>
> >>>
> >>> A general DNP submission:
> >>> Title: Double-polarization E and G observables in $\eta$
> >>> photo-production on the CLAS Frozen Spin Target
> >>> Abstract:
> >>> $\eta$ photo-production is an important tool in baryon spectroscopy,
> >>> allowing isolation of N* (I=1/2) resonances in one-step excitation
> >>> processes. Furthermore, it has long been recognized that due to
> >>> significant overlapping of resonances in the baryon spectrum,
> >>> differential cross-sections are not enough; measuring polarization
> >>> observables is vital. Extensive data have been collected at Jefferson
> >>> Lab in Hall B with circularly and linearly polarized tagged photon
> >>> beams incident on longitudinally polarized protons provided by the
> >>> Frozen Spin Target (FROST). The presentation will cover analysis and
> >>> preliminary results of double-polarization observables E and G in
> >>> $\eta$ photo-production - data entirely missing from the world
> >>> database.
> >>> _______________________________________________
> >>> Clas_hadron mailing list
> >>> Clas_hadron at jlab.org
> >>> https://mailman.jlab.org/mailman/listinfo/clas_hadron
> >>> _______________________________________________
> >>> Clas_hadron mailing list
> >>> Clas_hadron at jlab.org
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> >>>
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-- 
William J. Briscoe
Department of Physics
The George Washington University
Director, GW Institute for Nuclear Studies (GWINS)
Director, Data Analysis Center (DAC)
202-994-6788 (Foggy Bottom Campus)
703-726-8340 (Virginia Science and Technology Campus)
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