[Clas_hadron] Baryons 2013 Talk for Stuart Fegan

[A.M. Sandorfi]

Ken,
Some qualifying statements about slide 21 are certainly needed. Your
suggested projections for what will eventually be achievable are certainly a
positive spin, but I would suggest not promising too much yet. "G" is the
hardest of all the observables to extract because, as you point out, it
appears as only a small phase shift.

Andy




On 6/22/13 12:45 PM, "Ken Livingston" <Kenneth.Livingston at glasgow.ac.uk>
wrote:

> Hi Stuart,
> 
> The slides look good. In reference to your talk from the Had Spec
> working group meeting - and only I'm allowed to say this - try to be a
> little less "Scottish" in the presentation. Maybe more Italian? Enthuse!
> Just a couple of, quite important, suggestions.
> 
> On slide 19/20:
> You should fix the error bars as discussed yesterday to show that actual
> limits in cos theta - even if you have to just gimp  the plots.
> I'd say "Comparison with an preliminary data on an unpolarized proton
> target (g8b)". Don't say "older".
> I'd also remove the blue points, and phrase about "adjacent energy
> settings". This is just confusing and the comparison looks better
> without it.
> 
> Slide 21. Again, fix the plots to get the "error bars" showing the
> actual range in cos theta.
> 
> In presentation of slide 21. Focus on the positive. Something like this.
> "it's clear that there is a discrepancy in the results between the 2
> target settings. The most likely source of this is in the extraction of
> g, which is basically a small phase shift, using the binned fitting
> method. It is anticipated that using a moment analysis or event by event
> likelihood analysis will eliminate this problem.
> "However, the error bars are relatively small and indicate that a
> reasonable, first measurement of G for this channel will be achievable
> from this data, and will make a valuable contributions to the 1st ever
> complete measurement in pseudoscalar meson prod."
> 
> Regards,
> Ken
> 
> 
> 
> On 22/06/13 16:29, Stuart Fegan wrote:
>> Hi Everyone,
>> 
>> Sorry for the short notice, I was waiting until after my hadron
>> spectroscopy talk yesterday before sending my Baryons slides, you will
>> now find them on the g9 secure page;
>> http://www.jlab.org/Hall-B/secure/g9/sfegan/SFegan_Baryons2013.pdf
>> 
>> The talk will give an overview of my work towards measuring the G
>> polarisation observable for the strangeness channels K Lambda and K
>> Sigma, showing preliminary results for both the beam polarisation
>> observable and G, one of the beam-target observables, for K Lambda.
>> 
>> Unlike my aforementioned talk at the hadron spectroscopy meeting, my
>> Baryons talk should be a lot clearer, as I will not be showing the
>> original thesis results, whose comparison to my latest analysis was a
>> central theme of my talk to the working group.
>> 
>> Comments and/or suggestions are welcome.
>> 
>> Cheers,
>> Stuart
>> 
>