[Clas_cascades] minutes of today's meeting.

[Kijun Park]

Elton Smith wrote:
> Present: Elton, Hovanes, Stepan, Kijun
> On the phone: Lewis, Ralf, Zhiwen, Haiyun <br>
> Notes by Elton.
>
> == Announcements==
> # Haiyun successfully defended his thesis last Friday. Congratulations!
> # Haiyun has accepted a post-doc position at CMU (Reihard)
> # Zhiwen has accepted a post-doc position at UVa (working on parity
> violation)
>
> == Comments on Phi-- Note ==
> # Hovanes has made updates to the response to the committee including some
> figures
> # Latest response includes figures for the ctau of the Lambda and the
> Cascade.
> #* Lambda ctau~7.6 cm (full range) and ctau~8.2 cm (tail) and ctau-7.89 cm
> (PDG). Hovanes: The resolution is assume constant, but certainly depends
> on kinematics so will affect the fitted quantities.
> #* Xi ctau=3.9 cm (full) 4.3 cm (tail) and 4.9 cm (PDG). The Xi is highly
> contaminated with combinatorial background.
> # Items were listed that need completion:
> #* No. 9 and 11 need figues
> #* No. 13 asks about decays outside the start counter. At the moment the
> analysis does not require hits in the ST, which the trigger does. Hovanes
> can use the simulation to evaluate the faction of events that did not
> trigger because they decay outside the counter.
> #* No. 16 needs figure
> #* No. 25 see answers to normalization note. (done).
> #* No. 28. Elton has text from previous iteration. (done).
>
> == Comments on Normalization Note ==
> # Lewis: Working on subtraction correction from higher lying resonances.
> # Elton: Last week we agreed that the eg3/g11 comparison will be completed
> with the 2g correction, but not the additional subtraction, so that we can
> compare directly to previous documentation, as well as respond to the
> committee. As long as both samples are treated in the same way, the
> comparison should be valid.
> # Elton: Suggested to separate the file for Phi-- and Normalization, so
> that the groups can work independently.
> #* Completed: The new (normalization) file is
> docs/eg3/anotePhi1860/comments/SecondRoundComments_Normalization.tex. The
> Phi-- reply remains in SecondRoundComments.tex. The new files are now
> checked in.
>
> == gn -> K+Sigma*-(1385) ==
> # [[KSigma update May 5 2010]]: Haiyun
> # gn -> K+Sigma*-, Sigma*- -> Lambda pi-, Lambda -> p pi-. Final state is
> K+ p pi- pi-.
> #* Particles identified, Lambda selected as best p pi-.
> #* Eliminate K*0 contribution.
> #* Select exclusive by cutting on neutron in missing mass of K+ppi-pi-
> spectrum.
> #* Extract yield of peak in Lambdapi- spectrum. Side-bands of missing mass
> spectra is subtracted.
> #* Yield obtained in bins of costhe and Eg.
> #* Cross section vs energy obtained and compared favorably with previous
> data, except for low energy point in some spectra.
> #* Costhe cm distribution used to determine the ratio of 3/2 vs 1/2
> substate. K exchange contributes only to 1/2, K* can contribute to both.
> The measured large fraction of 3/2 substate points to large K*
> contribution. This is different than what was obtained by Guo for Sigma*0
> decays.
> #* Ralf: There are arguments that in a diquark model K* contributes to 3/2
> only. [Ralf can you check this statement??]
>
>
> == Next Meeting May 13, 9:00 am ==
> # Complete comparison of eg3/g11 with 2g corrections, but no high level
> resonance subtraction.
> # Phi-- response to committee
> # Normalization note (USC)
> # Haiyun post plots of angular distribution to wiki
>
>
> 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
> _______________________________________________
> Clas_cascades mailing list
> Clas_cascades at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas_cascades
>   
Hi, Lewis.
I just added up my response and cvs  check in.
Kijun


-- 
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Kijun Park
Jefferson Lab.
Suit 5 Room 12_1/B107
12000 Jefferson Av.
Newport News VA 23606
Phone 757-269-6989