LHC Higgs Combination Group (LHC-HCG)


The working group has been charged to produce a combined Higgs result from LHC (ATLAS and CMS) Higgs analyses. The mandate of the group is as follows

  • The implementation of Higgs boson theory aspects based on LHC Higgs XS WG recommendations will be discussed within the group. If needed, the group will request additional information from the LHC Higgs XS WG.
  • Monte Carlo generators and systematic variations are to be compared and unified where profitable and consistent with the overall MC and systematic uncertainty strategy in the individual experiments. This could result in sharing MC samples between ATLAS and CMS.
  • Technical aspects regarding the construction and usage of likelihood functions are to be discussed and solutions implemented as homogeneously as possible, including common naming conventions and tools. This includes efforts to construct simplified likelihood functions.


Conveners & Contact Roberto Di Nardo, Fabio Cerutti Mingshui Chen, Andrea Carlo Marini

Other members are: ATLAS and CMS spokespeople and physics coordinators and participating experts as and when needed.

Run 2 combinations

Communication tools

e-group mailing list For group's global issues, announcement of group meetings, meeting summary, ... Follow this link to subscribe yourself to the mailing list.
Contacts e-group mailing list For contact persons (restricted access).
Indico pages Group's workshop and subgroup meeting agenda system.
TWiki page Static information site that is updated mainly by contact persons. Group organization, minutes, documents, link for tools and meetings, ...


The agreed framework for the Higgs combination is the RooStats package available from ROOT releases and RooFit's RooWorkspace is the preferred format for sharing the data and likelihood model.

Discussion TWiki

GitLab repository

Main Repository in GitLab

The levels of repositories follows the structure shown in the image below. To clone a sub-repository use

git clone https://gitlab.cern.ch/lhc-hcg/Run-X/sub-project/repo.git


Run 1 composition

Combination Contacts Nicolas Berger Andrew Gilbert
Higgs X-section representatives Reisaburo Tanaka Chiara Mariotti
GammaGamma contact Hongtao Yang Nick Wardle
ZZ contact Richard Mudd Mingshui Chen
TauTau contact Swagato Banerjee Andrew Gilbert
WW contact Stefan Gadatsch Xavier Janssen
bb contact(s) Giacinto Piacquadio Stephane Cooperstein
ttH contact(s) Stefan Guindon, Maria Moreno Llacer Matthias Schroeder
MuMu contact(s) Haifeng Li Andrew Brinkerhoff
Fiducial and differential Florian Bernlochner Predrag Milenovic
Signal modelling contact(s)   David Sperka

Run1 Documentation

Support Note SVN
ATLAS: contacts + Tim Adye, Stefan Gadatsch, Fangzhou Zhang, Hongtao Yang & Eilam Gross
CMS: All Contacts + Marco Pieri, Mingshui Chen, Nick Wardle
ATLAS Combination Conf
CMS Combination Twiki

Paper SVN
Contact Editors:
ATLAS: Daniel Froidevaux (main), Tim Adye, Stefan Gadatsch, Fangzhou Zhang & Eilam Gross
CMS: Marco Pieri, Mingshui Chen, Nick Wardle
ATLAS Combination Conf
CMS Combination Twiki, arXiv

SVN Repository (Outdated)

SVN Repository
Couplings Work Spaces
Support note SVN
Paper: SVN

Some simple SVN instructions are at: https://svn.cern.ch/reps/lhchcg/doc/using-svn.txt

The repository can be accessed like so:

svn co svn+ssh://svn.cern.ch/reps/lhchcg
svn co https://svn.cern.ch/reps/lhchcg

We should start organizing some materials there, even if for now they are based on toy data:
- the WorkSpaces for ATLAS and CMS
- the combined WorkSpace
- any pieces of codes that could/should be shared
- documentation
- etc


Past meetings: https://indico.cern.ch/categoryDisplay.py?categId=3328

Useful Material

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