[Rivet] Jet constituents after smearing

[Andy Buckley]

The latter should be possible, but not currently via the normal projection route: SmearedParticles inherits from ParticleFinder, while FastJets accepts a more specific FinalState projection as its source of particles. This is something to generalise, but last time I tried it turned out to be more involved than you might expect.

You should be able to use FastJets "interactively" via its calc() mechanism, though, e.g. somefastjetsproj.calc(smearedparticlesproj.particles()); somefastjetsproj.jets(). We could/should also make that neater...
In response to the earlier question (I'm just back online after holiday), there's nothing specific to particle charge about the SmearedParticles mechanism, but the generic built-in smearing functions are mostly for well-isolated, fairly hard, identified particles. Constituent-level smearing for jet (substructure) reco would require something more specific than the built-ins -- that's part of why we don't currently smear the constituents of smeared jets (although I forget, do we rescale their momenta to be consistent with the jet momentum?) You can write your own constituent-smearing function fairly easily, though, with as simple or complex a smearing algorithm as you need.
Andy
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Experiment Group, University of Glasgow

On Feb 28 2018, at 7:16 pm, Deepak Kar <deepak.kar at cern.ch> wrote:
>
> Hi all,
>
> Following up on my previous email, is there a way I can use SmearedParticles as inputs to jet forming?
>
> Thanks,
> Deepak
>
>
> On Mon, Feb 26, 2018 at 8:05 PM, Deepak Kar <deepak.kar at cern.ch (mailto:deepak.kar at cern.ch)> wrote:
> > Dear experts,
> >
> > I am trying to calculate some jet substructure variables (using fastjet contrib) of a smeared jet. Now it looks like only the jet is smeared, and the constituent information is lost. I guess the right way will be to smear the constituents before making the jet, but I could not see a generic smearing for charged and neutral particles. I can probably hack the electron smearing to apply it on cnfs, but is there an elegant way?
> >
> > Thanks,
> > Deepak
> >
> > --
> > Deepak Kar
> > University of Witwatersrand
> > Room PM15, School of Physics
> > (0027) 011-7176958 (office) (0027) 0736944181 (mobile)
> >
> > While at CERN:
> > Building 1, R-016
> > (0041) 0767321349 (mobile)
> >
> > While at USA:
> > (001) 330-998-1500 (tel:(330)%20998-1500) (mobile)
> >
> >
> >
>
>
>
>
>
> --
> Deepak Kar
> University of Witwatersrand
> Room PM15, School of Physics
> (0027) 011-7176958 (office) (0027) 0736944181 (mobile)
>
> While at CERN:
> Building 1, R-016
> (0041) 0767321349 (mobile)
>
> While at USA:
> (001) 330-998-1500 (mobile)
>
>
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