Hi Joey,

this is a nice start to the QCD report.  I know the lattice results 
section will be beefed up soon, and I am looking forward to seeing a 
section on jets at the LHC that we'll discuss tomorrow.

What I was hoping to see is some discussion of QCD (beyond alpha_s) that 
we have special access to via a lepton or photon collider.  Much work has 
been done on this over the years, and some summary would be great if this 
is input to P5.


It is late to start anything else new, but for photon colliders I am 
finishing up a study while at Snowmass for a regular publication on how 
little we understand the apparent QCD structure of a photon above 1 GeV, 
and what we might be able to see at 160 GeV (Higgs factory), 250, 500 GeV.

At Snowmass 2005 I wrote a proceeding with roughly the same conclusions 
the new paper will have:
"Understanding Light: Why we need a terascale photon collider"
http://arxiv.org/abs/hep-ph/0509012

That study used a naive photon spectrum and was for 500 GeV.  The study I 
am doing now uses a realistic photon spectrum and more energies.  Given 
the tight deadline, you could start with that old paper as a basis for 
discussing something about QCD that is only accessible at photon 
colliders.

Is there any other physics we want to incorporate?

I will do what I can to get this study finished up so we can have a newer 
input into the report.

 	Zack


On Sun, 28 Jul 2013, Joey Huston wrote:

> Dear colleagues. Enclosed please find the current draft of the QCD report. There is still a fair amount of editing needed, and some contributions are still forthcoming, but we wanted
> it available before the start of Snowmass. We will continue editing through the workshop.
>
> regards,Frank, Joey, John, Ken
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