[Rivet] ATLAS prompt photon analysis

[Mike Hance]

Hi All,

I've attached a tarball that (I think) contains everything needed to put the ATLAS prompt photon results into HEPDATA, 
as well as a corresponding RIVET routine that seems like it might be doing the right thing.

One thing I should note up front is that, as far as I can tell, the paper doesn't have a proper SPIRES ID.  I suspect 
this will change when PRD finally publishes the paper (it's been accepted for publication, but I don't think it's 
actually made it into an issue of the journal yet), so in the mean time, I've called the analysis "ATLAS_2010_S1234567". 
  My attempts at calling the analysis something like "ATLAS_2010_PROMPTPHOTONS" were rebuffed by RIVET, so I'm not sure 
of the right thing to do in this case.  If you want me to relabel it as something else, just let me know; otherwise, 
feel free to call it whatever you like.

The contents of the tarball are:

ATLAS_2010_S1234567.info - The .info file that describes the analysis.

ATLAS_2010_S1234567.raw  - A flat file that breaks down the different (E_T, eta) bins and the corresponding 
measurements, uncertainties, and so forth.

ATLAS_2010_S1234567.dat  - This is the 'final' flat .dat file corresponding to the ATLAS measurements, for comparison 
with the RIVET output.

ATLAS_2010_S1234567.aida - The .aida file produced from the .dat file above.

ATLAS_2010_S1234567.plot - The .plot file for the three histograms associated with this analysis.

ATLAS_2010_S1234567.cc   - The RIVET routine.


I've tested this running PYTHIA standalone, but the cross sections for prompt photon production are low enough that the 
histogram never really gets populated.  I also ran the routine using the ATHENA RIVET interface against some ATLAS 
photon+jet (EVGEN) samples, and the results seemed reasonable, but I wouldn't be surprised if there are still some bugs 
lurking in there.  I'll try to test this stuff against some filtered dijet samples next week.

In any event, please feel free to let me know if there's anything unclear/wrong with what I've done, and I'll try to fix 
it ASAP.

Finally, thanks to everyone who helped (and bugged) us to get this done - I apologize it took us so long.  Next time 
should be much faster, now that we know what we're doing.

Thanks!

-Mike

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