CATphysics meeting, 14/11/2008 D. Froidevaux

Introduction and news New fellows since end of September:

W. Fedorko (ADT), M. Jimenez (ADE), D. Kollar (ADP), J. Lundberg (ADT), K. Tackmann (ADP), and T. Sumida (ADE) … Invited guests: C. Henderson and K. Vervink

Next meeting will be exceptionally on Wednesday 17th of December from 11h to 13h with drink and snacks afterwards

Analysis model issues Progress in physics studies? Yes with real influx and motivation from “new” fellows! We still have some time but we must get ready because we were not ready in September!

CATphysics meeting, 14/11/2008 D. Froidevaux

Analysis model issues Short document by Sven and Stathes attached to

agenda--> please read and comment to the PAT hypernews!

Issues are several: need a recommendation for D3PDs? need to minimise frameworks (four of five on the market now) re-reconstruction, re-calibration, re-vertexing, re-b-tagging,

etc should be run in Athena achieve the above by unifying and certifying tools (most

prominent examples are truth classification, isolation, overlap removal, etc)

tools are not enough (EventView and new TopReconstruction show that some EDM also needed)

stay tuned in to PAT meetings if you have an opinion!

CATphysics meeting, 14/11/2008 D. Froidevaux

Topics in direct photonsTopics in direct photonsBackground estimates Conversion rates and other observables (p/E, multiple conversions) as a tool for

photon versus 0/jet separation (Mayuko,Thomas, Kerstin) Calo lateral shower shapes as a statistical tool (Marcos) Presampler energy Isolation

Efficiency estimates Radiative Z decays Trigger efficiency

Photon identification cut isEM improvements (Valeria) Loose definition for filtering purposes (Marco) Interact also with -jet calibration

Isolation definition Calorimeter vs tracker isolation

MC samples Fake backgrounds (rate, shapes, different event generators) Signal: single photons, di-photons

Low energy 0 reconstruction (Junji, help from CAT calo reco experts) Calibration check a la CMS? Coupled to material mapping studies?

CATphysics meeting, 14/11/2008 D. Froidevaux

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Topics in direct photonsTopics in direct photons

• Use only unconverted • ATLAS ~ 25%?

• <E0> ~ 8 GeV but which trigger?

CMS

CMS

Working on 0 reco in min. bias events is as important initially for EM calo as working

on low-pT tracks for inner detector

CATphysics meeting, 14/11/2008 D. Froidevaux

Topics in SUSYTopics in SUSY

Finish work on data-driven background estimates (improvement is substantial on CSC work). Further work is of great interest to several persons in the group to assess independently the different background sources (tt, Wto l + jets, Z to +jets, etc)

Work on understanding ETmiss with early data, building

on work done by David:Minimum bias and pile-up, including cleaning up

instrumental tails in early dataDijet eventsEvents with true ET

miss such as W to l