[Rivet] Rivet meeting at 10:00 - minutes

[Andy Buckley]

Here's some rough minutes of today's phone meeting: please add more if 
I've forgotten or misunderstood.


Release schedule and targets
----------------------------
Aim for 1.1.3 release during or shortly after MC4LHC at CERN. Andy will 
work with Emily & Frank (at CERN) and James & Alex (at UCL) during that 
week, esp. on finalising the Tevatron Z dilepton definitions in 3 of the 
analyses. Once 1.1.3 is out, we start work on overhauling the 
histogramming for 1.2.0, and writing up the manual as a CPC paper to 
match that version, since we intend the whole design to then be stable.
ACTIONS: ALL


Axis label migration
--------------------
It's a bit embarrassing that we don't currently have labels on the axes 
of plots coming from Rivet, but that's mainly because AIDA doesn't 
support them. So I've hacked LWH to add them, and provided new histo 
booking functions which take the x & y axis labels as arguments (after 
the title arg). Using the no-axes versions of the booking functions will 
result in lots of runtime warnings: the plan is that these should all be 
eliminated by the time of the release. Please check your own analyses to 
make sure that axis labels are specified as the histos are booked, and 
be a good citizen and opportunistically patch up any others that you 
happen to see!
ACTIONS: ALL!


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)


Check your analyses for sensible norms & use of sumOfWeights
------------------------------------------------------------
Emily has removed the ill-advised auto weight counting from vetoEvent: 
any analysis which was depending on sumOfWeights returning the sum of 
event weights *to have passed the cuts* should check their analyses to 
make sure that they are doing the right thing: you may need to add your 
own weight counter member variable(s).
ACTIONS: ALL


DISKinematics & event rotation
------------------------------
James to implement the fixes we decided on (whatever they were!) for the 
DISKinematics projection. He will also look into the logistics of 
rotating events conventionally, and assuming it's reasonably 
straightforward will implement it for this release. We suspect that 
assuming a per-collider convention will be sufficient, hence no 
per-analysis versions of the event should be needed. For object 
ownership reasons, a deep copy of the incoming GenEvent should probably 
be made as it "enters" Rivet. Note that rotations should be implemented 
as rotations (e.g. x->x, y->-y, z->-z) rather than parity 
transformations (all x_i->-x_i) for proper physical invariance.
ACTIONS: JAMES


Mac Genser bootstrap script issue(s)
------------------------------------
Emily encountered problems when using the version of the Genser 
bootstrap script attached to the MacInstallationIssues wiki page. We'd 
forgotten about this and it was almost a year out of date! James 
reported that he uses the main agile-genser-bootstrap script for his 
Mac, so Emily will move to using that and update the wiki page to 
reflect reality!
ACTIONS: EMILY


Analyses: RHIC, UA1, UA5
------------------------
Andy is implementing min bias analyses at the moment, for LHC QCD tunes. 
James has a couple of HERA analyses that he's interested in. Frank has a 
couple of CDF jet analyses almost ready to go: Andy will prod Mike about 
getting some of their data into HepData. Hendrik will be working on the 
RHIC analyses that he's currently looking at on his US tour. Emily has a 
CDF analysis ready but is waiting for the data to pass CDF publication 
committee. Jon commented that we shouldn't get too UE-focused, but I 
forget which analyses he thought would be interesting ;)
ACTIONS: ALL, plus Andy to try and chase down Hw++ authors to implement 
some of their analyses


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, standard UE, UE as a 
function of |eta|, UE with different transverse region sizes, maybe some 
Gavin/Matteo type jet density stuff. It would be graet to have 
measurements that can be directly compared to Atlas/CMS first 
measurements: N_ch, |eta| distribution, low pT jets (incl, 1st, 2nd, 3rd 
pT, etc.) with good jet algs (anti-kT, SIScone, kT, 
Cam-Aachen(filtered)) etc.
ACTIONS: Everyone to have a think about non-UE observables, bearing in 
mind excellent tracking and PID (any strangeness observables? there's a 
LEP(?) paper on chain-lke production of strange baryons that could be 
maybe repeated at RHIC). Andy to relay the message to MC authors.


Validation
----------
Given that we've done some infrastructure overhauls, validation against 
the previous version of Rivet is important. Since the validator is most 
set up for Sherpa at the moment, we will check the same Sherpa events 
passed through Rivet 1.1.2 and 1.1.3 before releasing, and make sure 
that there is some decent documentation Web page with plots as part of 
the Rivet site.
ACTIONS: ANDY & FRANK


Other issues
------------
  * MCnet school: Hendrik is in charge, Andy and Emily (?) to get in 
touch about organisation.