[Gdh_lowq2] Cuts

[Marco Ripani]

Hi everybody,
I completed inserting all information from Hyekoo's and Krishna's 
previous CC analyses.
You can find everything in
http://www.jlab.org/~ripani/Reference/Group5.html
Only the 1.3 GeV and 3 GeV pages contain information as these were the 
two data subsets analysed (NH3).
To converge towards a definite choice, I would suggest to produce once 
more all Nphel distributions in all bins of momentum, theta and phi as 
in Krishna's analysis pages reported above, overlaying histograms with
1) only cuts 1-4
2) cuts 1-4, plus one version of Hyekoo's fiducial cuts. As you can see 
from his plots, using the green version is probably safer, but I would 
even say that the red version (a simple cut in theta_pr) can also work 
fine as all Nphel distributions are well detached from zero. You can 
make your own conclusion on that.
3) cuts 1-4 + fiducial + Osipenko cuts with "loose" time cut (time 
difference between SC and CC greater than -6 ns, right Xiaochao ?)
We should then look at the distributions and discuss them. If we are 
happy with the results, then we can just check that the cuts do a good 
job for the other energies and we're done (except that we will need to 
establish acceptance and efficiency of these cuts but this will be also 
necessary for the EC cuts etc.; for the acceptance, simulations will be 
needed).

Best Regards
Marco

-- 

Marco Ripani
Senior Scientist, Istituto Nazionale di Fisica Nucleare - Genova
Address:
INFN
Via Dodecaneso 33
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tel./fax 39-010-3536458
cell. 39-328-2191138
Jlab office room F244
tel. 1-757-269-7266  fax 1-757-269-6273
E-Mail: ripani at ge.infn.it