[Clas_hadron] abstracts for DNP

burkert burkert at jlab.org
Fri Jun 28 13:18:38 EDT 2013 

It is amusing to see how many email exchanges
one can have on a small topic. Keep it up! :-)
Volker

On 6/28/13 1:09 PM, Viktor Mokeev 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.
>>>> _______________________________________________
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