[Rivet] [Fastjet] Problem with JADE plugin?

[Gavin Salam]

Hi Andy,

Glad to hear the problem went away so easily!

Cheers,
Gavin

> Date: Sun, 27 Jun 2010 22:45:53 +0100
> From: Andy Buckley <andy.buckley at ed.ac.uk>
> To: Gavin Salam <salam at lpthe.jussieu.fr>
> Cc: fastjet at projects.hepforge.org, Rivet <rivet at projects.hepforge.org>
> Subject: Re: [Rivet] [Fastjet] Problem with JADE plugin?
> 
> On 25/06/10 17:12, Gavin Salam wrote:
>> Hi Andy,
>>
>>>> You can also try exclusive_ymerge_max (but I don't think it'll make much
>>>> difference -- I'm not sure which corresponds to what Jade did).
>>>
>>> I tried that -- at least for the 2->3 inclusive plot it made no
>>> difference to use the _max version of exclusive_ymerge. For the other
>>> transitions I got segfaults -- I guess that when using the ymerge_max(n)
>>> I need to explicitly make sure that n jets can definitely be found in
>>> the event?
>>
>> That sounds bizarre. We've got protection in there for such cases, in
>> which case you should just get zero. Can you provide a simple example
>> that triggers the problem?
>
> I thought I had the most up to date FastJet, but I was a patch version
> behind: updating from 2.4.1 to 2.4.2 fixed the ymerge_max crashing
> problem. And using the _max versions of the functions has fixed all the
> plot shapes: fantastic. Thanks, Gavin :)
>
> Holger, what FastJet version were you using? It should now definitely be
> 2.4.2 (or higher in future): I've added a configure check to that effect.
>
> Andy
>
>