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

[Frank Siegert]

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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