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LHC Higgs Combination Group (LHC-HCG)
Charge
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.
Composition
Other members are: ATLAS and CMS spokespeople and physics coordinators and participating experts as and when needed.
Run 1 composition
Documentation
Support Note SVN |
Editors: |
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 |
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, ... |
Software
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
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
SVN Repository (Outdated)
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
Links
Past meetings:
https://indico.cern.ch/categoryDisplay.py?categId=3328
Useful Material