[Rivet] Invisible BSM partilces in Rivet

[Silvan Kuttimalai]

Hi Andy and David,

I actually wasn't aware of the fact that there are fairly strict rules 
in place for the numbering. So it is quite likely that the particle 
codes in the model are wrong and that Rivet is doing everything 
correctly. The codes I just stumbled upon are +-5000521.

Many thanks for your help,
Silvan

On 10/25/2017 08:10 AM, Andy Buckley wrote:
> In my experience, many UFO models assign ad hoc PID codes which break
> the standard RPP MC numbering scheme -- they are either invalid
> according to the scheme definition, or overlap with something like a
> heavy nucleus code. In the last couple of years, some new generic BSM
> particle ranges were added to the PID scheme, and if they're being
> used then Rivet should return correct charge and spin info for them.
> If you send us some examples of BSM particles which are not being
> interpreted correctly, we can check for bugs.
>
> Thanks,
> Andy
>
> PS. This reminds me that ATLAS just recently submitted some extra BSM
> classifier functions to my MCUtils mini-package. I will port those
> additions to Rivet before the 2.6.0 release.
>
> On 25 October 2017 at 13:47, David Grellscheid
> <david.grellscheid at durham.ac.uk> wrote:
>> Hi Silvan,
>>
>> The visibility choice should now be based purely on physical properties,
>> no matter what the PID code is. If this is still going wrong, that's a
>> bug. Do you have an example of this?
>>
>> Thanks,
>>
>>    David
>>
>>
>> On 24/10/2017 19:49, Silvan Kuttimalai wrote:
>>> Dear Rivet Developers,
>>>
>>> I've come across an issue in Rivet when analyzing events that contained
>>> BSM particles which are supposed to represent some dark matter
>>> candidate. In many UFO models such particles are assigned an arbitrary
>>> particle ID and Rivet's guesstimate whether or not this particle is
>>> visible often gives the 'wrong' answer. Is there any way to tell Rivet
>>> on-they-fly whether or not to treat a certain particle as invisible?
>>>
>>> Many thanks,
>>> Silvan
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