sPHENIX HCal discussion

[John Haggerty <haggerty AT bnl.gov>]

While doing some writing on the pCDR, I was looking up some papers by 
Richard Wigmans, a prominent calorimeter expert (who visited with us 
early in sPHENIX history), which I put here:

> https://www.phenix.bnl.gov/WWW/p/draft/haggerty/sphenix/calorimeter_papers/

If you page through only one, look at

> https://www.phenix.bnl.gov/WWW/p/draft/haggerty/sphenix/calorimeter_papers/wigmans_calor11.pdf

which has good advice like

> If one wants to make real progress in this field, it is imperative that 
> scientific integrity be the guiding principle.

in addition to a very clear telling of the history of compensation, and 
his evidence that you can make e/h = 1 by adjusting the sampling 
fraction. I couldn't find the exact reference for Fe/scintillator, but 
the plot of e/h here:

> https://www.phenix.bnl.gov/WWW/p/draft/haggerty/sphenix/calorimeter_papers/Screen_Shot_2015-09-15_at_12.00.15_AM.png

seems to be consistent with our experience, where the sampling fraction 
of the outer HCAL is about 3.5% and the inner is about 7% and we 
evidence for e/h in the ballpark of 1.3 to 1.6.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358