[Clas12_verystrange] meeting minutes

[Lei Guo]

Below are the meeting minutes, and they are also on the wiki page.
Attending: John, Michael, Igor, Eugene, Veronique, Lei
Minutes:

  Our proposal reviewers are Keith Griffioen and Marco Battaglieri

Item 1: The effect of the FT resolution on the s/b ratio. FT  
resolution IS included in Derek and Michael's simulation. However, if  
it is not clear, for example in the reaction of gamma p->K+K+K0K- 
(Lambda), the K0 mass is constrained in reconstructing the missing  
lambda, and the lambda four momentum can be reconstructed using the  
lambda mass in order to improve the S/B ratio for M(LambdaK-), as  
opposed to MM(K+K+K0K-). Derek an Michael seems to have all the data  
to check the effects.
Item 2: Eugene raise the issue of comparison with gluex. Our main  
advantage seems to be the momentum resolution/PID and vertex detector.  
We need to find the relevant GlueX parameters for comparison.
Item 3: Is Kaon decayed handled in FASTMc. We are not sure, but the  
answer is probably not. However, even if kaon decay, the track can  
still probably be reconstructed. The effect should not be big since  
most kaons move close to speed of light and time dilation works in our  
favor. The best way to check this quantiatively, without full CLAS12  
simulation, is to do this in CLAS simulation by comparison  
efficiencies with and without decay.
Item 4: Xi(1820) efficiency seems too low (from Johann, using a  
hyperon-decay based Xi(1820) produciton mechanism), when compared with  
a similar reaction for Omega- (Derek and Michael, using phase space),  
by a factor of 6. Whether this is due to the physics in the generator  
or other factors remains to be sorted out. Michael agrees to come up  
with the Xi(1820) efficiency using phase space, but since Xi(1820) is  
not included in Phythia, it will take a bit of time. On the other  
hand, Johann should try to reproduce the Xi-(1320) number produced by  
Michael to see if there is anything mistaken in his simulation since  
it only started to work late last week.

Lei


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      /   ___  ___  Lei Guo _______________________
     L_O_/ ____ Florida International University____/_/
         \   |             Physics Dept., CP  
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      /    \ |             Miami, FL  
33199        /                       /  /
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305-348-0234(o)

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