[Clas_cascades] Minutes 11/3/2010

[Igor Strakovsky]

Hi Elton,

I am in Santa Fe now and have no chance to see what you did upon my request.
Again, can you please show me what I asked 100 times

Thanks, Igor

On Thu, 4 Nov 2010 13:49:25 -0400 (EDT), Elton Smith <elton at jlab.org> wrote:

> 
> resent: Elton, Hovanes, Zhiwen, Stepan
> On the phone:  Ralf, Kijun <br>
> Notes by Elton.
> 
> == Announcements==
> # No meeting next week due to the collaboration meeting.
> 
> == Draft of Phi-- Paper (Hovanes) ==
> # Hovanes uploaded a new version a couple of days ago.
> # Stepan has provided comments. Elton made suggestions to the section on
> upper limits.
> # Kijun has some comments he will send in. Ralf will try to finish reading
> the draft today.
> # Ralf: Abstract mentions the Lambda pipi mass spectrum, but it is not in
> the paper. We discussed this and concluded that it should be taken out of
> the abstract but nevertheless the figure should be added to the paper. It
> will make it easier to explain the steps to obtaining Fig. 10.
> # Hovanes suggested changing the title to  "upper limits for
> photoproduction cross section of Phi--". No strong opinions were offered.
> # Generally, we all need to review the title, abstract and conclusion
> section once the paper is close to final.
> 
> == Analysis note for Lambda(1520) (Zhiwen) ==
> # Recoil spectra of MM(K), requested by Igor were shown for both MM(K0) in
> gn(p)->pK-K0(p) and also for MM(K+) in gp(n)->pK-K+(n). In both cases the
>Fermi momentum blurrs the Lambda peak. The invariant mass of pK- has much
> better resolution. In both cases a correction for the Fermi momentum is
> obtained by MM of all three detected particles.
> # Ralf: The Fermi momentum distribution is fairly accurately reproduced,
> so it is surprising that the resolution of the pK- invariant mass is not
> mostly recovered. This was discussed without final conclusion, except that
> it is likely that the resolution in missing momentum is poor compared to
> that required for computing the invariant mass. Ralf suggested that the
> generated Fermi momentum be smeared with expected detector resolution to
> see how much it changes the distribution.
> # [http://www.jlab.org/~zwzhao/totalXsection_high.gif Total cross section
> for Lambda(1520)] plotted vs energy, shows a large discrepancy in the
> lowers energy point (1.75-2GeV). The estimated cross section is about
> 3+/-1 micro b cross section oompared to about 0.8 microb from other data.
> No systematic errors are included, and no bin-centering corrections.
> # Suggestions on what to look for are: check the kinematic cover of the
> bins at high -t. Check bin-centering corrections. Consider differences of
> cross section measure with/without phi cut as a measure of the sytematic
> uncertainty.
> 
> 
> == Next Meeting Nov 18, 8:00 am ==
> # Phi-- Draft of paper (Hovanes)
> # Lambda(1520) update (Zhiwen)
> 
> 
> Elton Smith
> Jefferson Lab MS 12H5
> 12000 Jefferson Ave
> Suite # 16
> Newport News, VA 23606
> elton at jlab.org
> (757) 269-7625
> (757) 269-6331 fax
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Igor Strakovsky, SAID CNS The George Washington University
Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org