[Clas_cascades] Minutes Thu Jul 29 posted

[Zhiwen Zhao]

Some of my comments on the July 29, 2010 version Phi--(1862) analysis note
Many of them are certainly my problem of understanding.

1. p10. It might be good to mention that momentum cut of p and pip are 
determined by comparison with simulation ( at least this is what I remember how 
it's done?)
2. p13. the second last paragraph, should it be "as a function of phi". Also has 
the momentum correction be applied? I notice it improves the resolution a little 
bit in Lambda1520 study
3. p15. \tau is the life time in particle rest frame, the actual decay length in 
lab frame is c\tau\gamma\beta or c\tau*p/m, I see the equation 5 missing the \beta ?
4. p21. The difference between event start time and tagger hit time is 3.2ns. 
How is it determined? For E,T-counter matching, I remember it's 1-187 Ecounter 
to 1-19 Tcounter. Tagger cut is not present for both liberal and conservative 
selection, right?
5. p26. In the right plot of fig 15, why those sideband in simulation? Why many 
beta > 1 particles?
6. p29. If we can determine the ST effect in every mass bin, why can we use the 
the "actual acceptance with ST requirement" instead of using the "nominal 
acceptance with a 15+-5% correction?
7. p37. what are the three independent parallel analysis?
8. p43. I am not very clear about why the "unknown" background is as it is?
9. p51. The final upper limit plots show no sign of Phi--, but with all the 
fluctuation (particularly those peaking structures), can we conclude that we can 
detect the Phi-- if it is actually there?
10. p60. For the last sentence of the statement, the 700pb upper limit safely 
exclude the models without form factor in Fig 2, but can it really exclude the 
the model with form factor and coupling g>0, which is almost at or below 1nb.

Thanks

Zhiwen


On 7/29/2010 2:33 PM, Elton Smith wrote:
>
> Present: Elton, Stepan, Hovanes, Kijun
> On the phone: Lewis, Zhiwen<br>
> Notes by Elton.
>
> == Announcements==
>
> == Normalization ==
> # No changes, latest version posted on wiki
> # All tex and figures will be added to the cvs repository for save
> keeping.
>
> == Comments on PHi-- Note ==
> # Correction for decays outside of target estimated to be 15+/-5%.
> # This correction has been included into the upper limits
> # All documentation has been updated to reflect latest results
> # Upper limit has increased to 700 pb, with the addition of the 15% loss
> for decays with 5% uncertainty, as well as updated number number of
> 10->15% uncertainty in normalization.
> # Figure 20? in normalization note has been included into the response to
> the committee. Lewis will send Hovanes the .eps file for best
>
> == Draft of Phi-- Paper ==
> # Hovanes will start a draft of the paper.
> # The draft will be provided to committee as soon as appropriate, but
> response will not be delayed.
> # We discussed how to include comparison of g11/eg3 Delta production.
> Elton suggests to mention comparison in text but no figure so that CLAS
> may allow publication to proceed without formal review of that data. In
> any case the final results depend on it only indirectly as input to the
> systematic error on the normalization.
>
> == Theses ==
> # Zhiwen and Haiyun should provide final pdf versions of their theses to
> Reinhard for posting on CLAS thesis page.
>
>
> == Next Meeting Aug 5, 9:00 am ==
> # Everyone read and comment on Phi-- analysis note and response to
> committee. Any suggestions should be incorporated before next week.
>
>
> 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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