[Rivet] FHerwig in Agile

[Andy Buckley]

On 19/07/11 15:58, Andy Buckley wrote:
> Hi Gavin,
>
> Thanks for that... I've made that fix in FHerwig, FHerwigJimmy, and the
> AlpGen* variants of both of those. I'm wondering, though, *should* the
> soft UE be being called in the Jimmy variants? I suspect not... and
> wonder how much of an effect this has on UE observables :S Anyone know
> for sure?

Argh, I just tried running JIMMY out of the box with the soft UE call 
included in the AGILe interface, and with it taken out: the effect on an 
ATLAS 7 TeV UE observable is attached. I'll save you the trouble of 
looking at it.

If the soft UE *should* be switched off when running JIMMY, then all 
HERWIG+JIMMY UE tunes made using AGILe are wrong -- I checked AGILe 
1.2.1 and it contains the same call. I don't know if e.g. the ATLAS ones 
were tested with the ATLAS Herwig interface before production... I'll 
follow up on that. Of course, if the soft UE *should* be used at the 
same time as JIMMY, we're fine, but I get the feeling that that ain't 
how it's meant to work :(

We should get a definitive answer before making the next beta tarball... 
asap. Does anyone know for sure?

Andy

-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

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