[Rivet] Rivet meeting at 10:00 - minutes

[Andy Buckley]

Hendrik Hoeth wrote:
> 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.

Of course. I lose track of all the names! Thanks, I've done the complete 
migration to FastJet now.

>> What measurements we'd like from RHIC

>> 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.

Cool. I hope it's a better implementation than the CDF 2004 cone UE!

>> 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.

Sounds like a perfect thing for them to allocate some time to: everyone 
should have a decent N_ch result!

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

Okay. But maybe that's still broad enough to get most of the shape at 
200 GeV? It would also be nice if the Tevatron experiments were to 
publish up to date |eta| spectra at 1960 GeV.

>> 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".

"low pT" is Jon's phrase: since we were talking about it in the Atlas 
context, that really just means everything in RHIC pp!

> 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.

Great: it's good to see that they're doing the same as the LHC 
communities in terms of jet defs, and that promises to be a lot of nice 
data.

Andy