[G12] pKp[Km] ntuple

[Carlos Salgado]

Dear Johann

Great!  I assume that you have made your standard cuts? Could you let's us know
the cuts. Also what mass cuts to select K_m before fitting.
see you Carlos

On Nov 2, 2011, at 4:24 PM, Johann Goetz wrote:

> Hi all,
> I was not sure who to send this to so I sent it to the g12 mailing list.  I am outputting a small ntuple of proton K+ events where I have kinematically fit to a missing K- with a probability selection of >1%. I have briefly looked at the data to make sure the numbers are reasonable (see phi(1020) peak attached). 
> 
> I am copying the files here:
>     /volatile/clas/clasg12/goetz/pkp_km_kfit_ntuple
> 
> The files I have processed so far are __complete_runs__ meaning that every event was considered in the given run. e.g. the file kaon.good.56363.txt includes all data from run 56363 ("good" here means non-trip regions). These are plain-text files and the first two lines are header information: first line is column label and the second line is column type: i4 = int, f4 = float.
> 
> I included the run and event number, the beam energy (ebeam) and the four-momenta of the three particles p, kp, and km. The other columns are the results from the kinematic fit. The one you might want to look at is "kfitprob". I made a selection on this variable at >1%, but you might want to first increase this to 10% if you find you have any background you can't explain.
> 
> >head -3 kaon.good.56363.txt 
> run event kfitprob kfitchi2 kfitpull_ebeam kfitpull_p_mom kfitpull_p_lam kfitpull_p_phi kfitpull_kp_mom kfitpull_kp_lam kfitpull_kp_phi kfiterr_km_mom kfiterr_km_lam kfiterr_km_phi ebeam p_e p_px p_py p_pz kp_e kp_px kp_py kp_pz km_e km_px km_py km_pz
> i4 i4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4 f4
> 56363 40481 0.619477 0.246603 -0.507221 0.367299 0.49034 -0.507834 0.513646 -0.477136 0.501621 0.018267 0.0236273 0.0236293 2.9719 1.12352 -0.0508986 -0.243942 0.565551 1.80493 0.366565 0.431194 1.64126 0.981723 -0.315666 -0.187252 0.765084
> ...
> 
> -- 
> Johann T. Goetz, PhD.
> jgoetz at ucla.edu
> Nefkens Group, UCLA Dept. of Physics & Astronomy
> Hall-B, Jefferson Lab, Newport News, VA
> Office: 757-269-5465 (CEBAF Center F-335)
> Mobile: 757-768-9999
> 
> <kpkm_inv_mass.png>_______________________________________________
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