[G8b_run] Overlap Studies

[Barry Ritchie]

Ken, have you been able to push your similar analysis in the K-Lambda channel further? If not, it may still be useful to discuss the preliminary results you have.   ---BGR


Professor Barry G. Ritchie
Department of Physics
Arizona State University
Tempe, AZ　 85287-1504

Telephone: (480) 965-4707
Fax: (480) 965-7954



-----Original Message-----
From: g8b_run-bounces at jlab.org [mailto:g8b_run-bounces at jlab.org] On Behalf Of Michael Dugger
Sent: Monday, November 07, 2011 3:22 PM
To: Volker Crede
Cc: g8b_run at jlab.org
Subject: Re: [G8b_run] Overlap Studies


Hi,

At this point, I think we can clearly see that the photon energy cut is important. Also, that mixing in events with photon energies greater than the coherent edge helps make the comparison between the 1.3 and 1.5 sets look to be in better agreement. However, even though the comparison between the 1.3 and 1.5 sets look better when we allow photons with energies greater than the event edge, the polarization of the photons with energies greater than the event edge are suspect due to difficulties in fitting the enhancement too far past the "roll off".

Volker: Thanks for the update.

Take care,
Michael


On Mon, 7 Nov 2011, Volker Crede wrote:

> Hi all,
>
> I have posted an updated version of last week's slides at:
>
>     http://hadron.physics.fsu.edu/‾crede/FILES/volker_g8b_v2.pdf
>
> All slides with an * in the frame title are new. You may remember that Michael noticed last week that I had data points for the 1.5/1.7 PERP comparison at low eCounter values that he did not have. I think we figured out over the weekend why that is. While I applied a lower-energy cut of:
>
>     energy  >  (eventEdge - Ecut),
>
> I did not apply the upper energy cut (that he does) of:
>
>     energy  <  eventEdge.
>
> Interesting enough, this upper energy cut seems to remove some of the suggestive energy dependences we discussed last week. I may be able until Wednesday to repeat the analysis (with the 200 MeV cut) and also apply the upper energy limit.
>
> Also, it looks like the 200 MeV cut does a good job, although the energy dependence here seems to be coming in at higher eCounter values compared to Mike's results, e.g. slides 8 and 9.
>
> Best wishes for the moment
>
>       Volker
>
>
>
>
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