PWG2 input for the Tag system

There is an ongoing discussion of the Tag system, and the PWG2 was asked to give input on the topic. For a complete introduction please see the presentation at the PWG2 meeting: Presentation about Tags

The PWG2 was asked to provide feedback on the following questions:

Is the current content of the Tag objects enough to perform the basic tasks: the selection of interesting events and grouping of the events into "similar" groups. For reference please see the content of the tag objects in AliRoot SVN:

AliRunTag.h

AliLHCTag.h

AliDetectorTag.h

AliEventTag.h

Discussion:

We need a "standard" event multiplicity, that is a multiplicity of tracks that pass standard quality cuts. This requires the development of the "standard cuts"

The tags contain the number of "pions, kaons, protons, electrons, muons" in the event. The criteria by which the particles are identified need to examined and checked whether they suit our needs.

What kind of "second-level" information would we want to provide to be stored in Tags.

Discussion

We will provide the reaction plane information. The code to calculate it has been recently provided by Flow, still waiting for the submission into SVN.

Which fields in the Tag do we consider to be the "ESD-level" (that is they will not change from ESD to AOD tags) and which should be the "AOD-level", which means it will reflect the content of the AOD, after all the cuts

Discussion

The "Standard" event multiplicity is obviously an "ESD-level" value.

-- AdamKisiel - 2009-08-27