[Rivet] CMS_2015_I1397174

[Andy Buckley]

Requiring exactly 2 prompt (i.e. not-from-hadron-decay) charged leptons 
with substantial pT should do 99% of what's required, I think! This is 
pretty easy to do.

But I saw some code in there which also categorises b-jets according to 
whether they come from top decay or not... so maybe the connection is 
deeper? Complex "HepMC digging" analyses like this can take a while for 
us to integrate, because we really need to go through them in detail and 
make sure everything makes sense & uses appropriate machinery.

Andy

PS. By the way, is there really no pT cut on the b-hadrons that you 
consider as tagging a jet? You can use e.g. jet.bTagged(Cuts::pT > 
1*GeV), for example, or a similar argument to Jet::bTags()


On 19/07/16 15:13, Markus Seidel wrote:
> Hi Andy,
>
> thanks for the feedback!
>
> Actually, the parton level stuff is needed here only for selecting the
> ttbar decay channel (dilepton ee/emu/mumu). Is there a better way to do
> that?
>
> Cheers,
> Markus
>
> Am 19.07.2016 um 15:57 schrieb Andy Buckley:
>> On 19/07/16 14:47, Markus Seidel wrote:
>>> Hi all,
>>>
>>> for some reason this analysis did not make it to the mailing list after
>>> uploading (in April):
>>> https://www.hepforge.org/archive/rivet/contrib/NEW/CMS_2015_I1397174.tgz
>>>
>>> It contains jet multiplicity, pt, eta, etc... measured in ttbar events
>>> at 8 TeV.
>>
>> Hi Markus,
>>
>> We've not yet incorporated this one because (as the code acknowledges)
>> it uses a non-portable partonic top quark definition and introduces a
>> lot of custom machinery that we need to merge carefully into the Rivet
>> system.
>>
>> We've decided to allow partonic top definitions in "official" Rivet
>> analyses, but have not provided the central machinery for that yet. When
>> it is ready, this analysis will still require significant effort to
>> include in the distribution... but in the meantime the code is still
>> publicly available in the contrib directory for anyone who wants to
>> use it.
>>
>> Cheers,
>> Andy
>>


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