[Clas_hadron] abstracts for DNP

[Michael Dugger]

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
>> https://mailman.jlab.org/mailman/listinfo/clas_hadron
>>
> _______________________________________________
> Clas_hadron mailing list
> Clas_hadron at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas_hadron
>