[Clas_hadron] abstracts for DNP

[Eugene Pasyuk]

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.
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