[Rivet] Invisible BSM partilces in Rivet

[Andy Buckley]

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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-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow