[Rivet] Rivet validation of higgs- > gamma/gamma plugin

[Michaela Queitsch-Maitland]

Hi Holger,

The routine was validated using a gluon fusion MiNLO HJJ sample: 

mc12_8TeV.181085.PowhegPythia8_AU2CT10_HJJ_MINLO_ggH125_gamgam.evgen.EVNT.e2005

scaled to XS*BR = 19.27*0.00228. No other production modes were included for the validation. The results from the routine were compared against the analysis code (used to derive the unfolding factors for the data) with very good agreement. The plots in the publication were also reproduced by Roman Lysak (ex ATLAS Rivet contact) using the routine. Unfortunately I don’t have the plots from the ‘final’ version of the routine — Roman would have those.

Let me know if you need anymore information.

Cheers,
Michaela

On 19 Mar 2015, at 20:07, Frank Siegert <Frank.Siegert at cern.ch> wrote:

> Hi Holger,
> 
> with a plain Sherpa H->gamma gamma setup the BRs will be screwed up,
> so a factor of 10 can be expected.
> There are new options for the upcoming Sherpa 2.2.0 which allow to fix this:
> http://sherpa.hepforge.org/doc/SHERPA-MC-2.2.0.html#HDH_005fWIDTH
> 
> For Sherpa 2.1.1 you are best off running without BR weights
> (HDH_BR_WEIGHTS=0) and multiplying with the correct H->gamma gamma BR
> manually at the end.
> 
> Cheers,
> Frank
> 
> 
> 
> On 19 March 2015 at 19:54, Holger Schulz <holger.schulz at durham.ac.uk> wrote:
>> Hi Michaela,
>> 
>> in preparation of tomorrows release of Rivet we are currently validating the
>> contrib plugins
>> and I am having trouble with yours.
>> 
>> Maybe you could tell me your validation procedure, i.e. which MC you ran
>> with what channels
>> and so forth.
>> 
>> I am seeing a factor of 10 discrapancy in a sherpa generic H->gamma gamma
>> setup.
>> 
>> Best,
>> Holger
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