[Rivet] Invisible BSM partilces in Rivet

[Andy Buckley]

Have a look on the PDG website for the ID scheme definition document.
That code is probably invalid, but it wouldn't be 100% unreasonable
for a decoding program to interpret it as a Kaluza-Klein resonance of
a B+ meson ;-)

Andy


On 25 October 2017 at 16:51, Silvan Kuttimalai <silvan at slac.stanford.edu> wrote:
> 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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>>>
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>>
>>
>>
>



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