[Clas_hadron] abstracts for DNP

Igor Senderovich senderov at jlab.org
Fri Jun 28 20:30:57 EDT 2013 

Agreed - I'll mention exclusive reconstruction rather than "one-step". And yes, even just missing mass reconstruction of the photo-produced system screens out eta+pi emissions.
Best,
-Igor 

----- Original Message -----
From: "Bill Briscoe" <briscoe at gwu.edu>
To: "Viktor Mokeev" <mokeev at jlab.org>
Cc: "Michael Dugger" <michael.dugger at asu.edu>, "Eugene Pasyuk" <pasyuk at jlab.org>, "Barry Ritchie" <Barry.Ritchie at asu.edu>, "clas hadron" <clas_hadron at jlab.org>
Sent: Friday, June 28, 2013 10:10:30 PM
Subject: Re: [Clas_hadron] abstracts for DNP


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 
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>>> https://mailman.jlab.org/mailman/listinfo/clas_hadron 
>>> _______________________________________________ 
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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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