[Rivet] Rivet meeting at 10:00 - minutes

[Hendrik Hoeth]

Thus spake Andy Buckley (andy.buckley at durham.ac.uk):

> Migrate TrackJet, Jade & D0ILC jet algs to FastJet
> --------------------------------------------------
> We're happy to migrate to FastJet 2.4.0, since we can ensure that Atlas 
> does the same! Andy will do the conversions. We will still be missing 
> the Durham alg, but hopefully we can now just bundle and build Hendrik's 
> Durham version of his Jade plugin with Rivet, rather than having to rely 
> on users to patch FastJet itself.
> ACTIONS: ANDY (& HENDRIK)

Uhm ... Durham ist "e+e- kt". It was Jade that was problematic, not
Durham, but they've also got Jade in their release now. So we can and
should move completely to fastjet.

> What measurements we'd like from RHIC
> -------------------------------------
> Hendrik has clarified that he wasn't just asked about UE analyses, but 
> from our discussion we identified <pT> vs N_ch,

<pT> vs N_ch is in a STAR thesis and we can extract it from there if
we don't find it anywhere else (the version I found in a paper was
uncorrected). Anyhow I'll put it on the list, as it's simple and they
have more statistics now.

> standard UE,

That's already in preparation. I've seen uncorrected plots, and for the
observables with a reasonably flat correction I will get the raw numbers
and an approximate correction factor.

Actually there are even two UE analyses. One uses the "traditional"
regions, the other looks at a cone around the leading jet instead of the
full toward region.

> N_ch,

Surprisingly, this seems to be difficult to find. The reactions here
were "of course we have it! wait ... I can't find it.". So I found an
uncorrected N_ch, and I found charged particle pT spectra binned in
N_ch, but not yet a trivial N_ch that is corrected.

> |eta| distribution

Haven't seen that so far, but: Their tracking is just |eta|<1.

> low pT jets (incl, 1st, 2nd, 3rd pT, etc.) with good jet algs
> (anti-kT, SIScone, kT, Cam-Aachen(filtered)) etc.

I guess "low pT" is relative, and there is no such thing as "multijet"
at 200 GeV. They see dijets, but that's it. For them a 30 GeV jet is
already "high pT".

About the jet algorithms: A midpoint jet pT distribution is published,
implemented in Rivet (not commited to svn yet), and working fine. I've
seen kT, anti-kT, and SIScone jet pT distributions hot of the presses,
but that data still needs to be corrected and will be published soon.

     Hendrik

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