------------ 11.02.2010 HiggsBR phone meeting ------------

Participants: Michael, Sven, Ansgar, Ivica, Georg, Chiara, Rei, Jae Yu, Daniela 

SM Higgs BR-------
Programs/calculations available: HDECAY, PROPHECY4f, EW NLO calculations.
Current status of the calculations done for SM Higgs BR the ATLAS Note discussed: 
- is the Aglietti, Bonciani, Degrassi, Vicini calculation for EW NLO complete? 
if not, we could consider using the Actis, Passarino one
- theoretical uncertainty missing on the BR calculations (expected to be small 
for QCD side, larger from EW)

MSSM Higgs BR----
Programs available: FeynHiggs, HDECAY, CPSuperH.
The situation is even more complicated than in the SM, since even the
Higgs boson masses depend on the SUSY parameters. Consequently, one
cannot even choose one of them for the BR calculation (except MA - 
or MH+ if we work in the cMSSM, i.e. the MSSM wich complex phases).
For the masses there are two codes: FeynHiggs and CPSuperH (which only
allows MH+ as input).
Similar considerations for the couplings and mixing angles - which goes back
to the MSSM XS group.
Outcome of the discussion: the idea is to prepare machinery rather than 
producing numbers, but we need benchmark points to compare results. 
We should work in contact with the MSSM cross section 
subgroups.

General comments ------ 
- Rei: The agreed strategy is to calculate the decay partial width as much 
accurate as possible for each decay modes, and then cook them for the BRs. 
Correlated an uncorrelated errors should be taken into account properly when 
computing the BRs. BRs should be calculated to SM Higgs mass up to 1 TeV.
- Michael: we should as much as possible, compare different calculations and 
understand discrepancies, if any. First in the SM Higgs, since here the only 
unknown parameter is the Higgs mass, so that the comparison is quite 
straightforward and clean. Comparisons for the MSSM are much more involved. 
Particularly welcome to our meetings: Giampiero (for the interplay with the PO 
studies) and Markus Sch. (for the MSSM BR) :-)

Homeworks :-) -------------------
- Ivica and Daniela: redo and validate ATLAS calculations, complete with the 
missing tables (i.e. ZZ and WW BR, but also llnunu, 4l, lnuqq for the high 
masses), upload the tables on the Twiki
- Ansgar and Michael: work together on the BR theoretical errors
- Michael: contact Giampiero to check his availability to provide a grid of 
EW NLO numbers to be used in different codes
- Daniela: contact A. Vicini et al. to check the status of their calculations 
and their availability to provide a grid of numbers, "think" about the comment 
by Ansgar on formula (7) pg 16 of the ATLAS draft
- Sven: prepare a survey of the MSSM BR status (codes, problematics, etc.), to 
be used as starting point for work and discussion.