Light Mass Higgs subgroup
Goal of the group
Quoting from the "letter of intent":
- issues concerning XS * BR, in particular issues connected to the decays H -> gamma+gamma, tau+tau, bb, WW and ZZ
- Higgs property measurements: Higgs mass, (width), sigma*BR, J^PC, couplings (HVV, Yukawa, trilinear, quartic).
Discuss main theoretical issues (concerning XS * BR) and create tools to be used by ATLAS and CMS (+CDF+D0) to analyze Higgs boson data available in 2012 and beyond, including branching fractions, couplings to SM particles, anomalies in the present data (gamma+gamma and WW signals), evidence of spin zero and how this possibility could be confirmed in the near future, separation of signal and backgrounds and strategy for measuring the mass and other characteristics of a putative signal.
Group Contacts
Action items
- Explore the coupling structure within the LO framework
- Calculate theory uncertainties for whatever coupling parameters are used or give at least some limit estimate on the uncertainty. For now the SM cross section and BR uncertainties are used
- Check with jet group if additional uncertainties appear for a coupling fit due to analysis in exclusive jet bins
- Especially the ggH contamination to VBF categories is a problem
- Develop a NLO coupling fit framework
- Prepare a recommendation framework addressing effective BSM Lagrangian approaches and anomalous couplings
- Explore the Higgs coupling tensor structure
- Prepare a recommendation framework for Spin/CP
- Derive recipe how to simulate resonances with different SPIN and CP quantum numbers
- Check possibility of reweighting fully simulated SM MC events by ratio of matrix elements
- Possible with VBFNLO
- So far not possible with JHU
- Compare different parametrization for anomalous couplings of an observed resonance.
- For VBF tag jet based CP determination, especially the ggH contamination to VBF categories is a problem
Meetings
References and Links
Results
LHC HXSWG interim recommendations to explore the coupling structure of a Higgs-like particle
- The current document draft can be found here: LHCHXSWG-2012-001.pdf
- A sample implementation of the coupling scale factor framework can be found on SVN. For the implementation the following tables and numbers are used:
- Calculated with HDECAY and copied from here:
- Calculated within the MSSM group:
- Calculated with VBFNLO:
- Tables of SM BR:
- Example root script
Old Stuff
-- ReiTanaka - 23-Apr-2012