diboson and TGC group

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Alexander Oh (School of Physics and Astronomy Schuster Laboratory), Matthew Herndon (Department of Physics), Shih-Chieh Hsu (Physics Division), Vuko Brigljevic (Institute Rudjer Boskovic)
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Date 29.3.2012
Participants: Vuko Brigljevic, Matthew Herndon, Shih-Chieh Hsu, Alexander Oh

CMS and ATLAS exchanged slides about fiducial volume definitions and aTGC parametrisations
Following issues where raised:

- WW cross section different (theoretical) by ~10%. Why? gg contributions are included.
- W gamma cross section MCFM differ between ATLAS and CMS

AI: follow up with MCFM experts in each experiment to find cause. Exchange steering cards, try to have results by next week.

- CMS uses Lff = inf
- Re-parametrisation with L(NP) proposed by CMS.
- CMS uses for ZZ h3,h4(Z,gamma), but ATLAS uses f4,f5, 

AI: need to be checked.

- ATLAS defines lepton dressing with photons, CMS uses bare letpons. 
- CMS does not use the neutrino in the fiducial cross section definition, while ATLAS does.
- ATLAS uses a jet veto while CMS does not.

AI : CMS will discuss these points internally.

- Agreed to define or'ed fiducial volume (ATLAS || CMS), discuss proposal at next meeting.

AI : Define or'ed fiducial volume.

- ATLAS uses zero width approximation for ZZ analysis, while CMS uses line shape.

AI : Can ATLAS use line shape MC?

next meeting: 5th April, 6pm CERN time.
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