LHC Higgs Cross Section Working Group

Red led News

* LHCHXSWG Next General meeting November 9 (Mon.) - 11 (Wed.) 2020 NEW

Red led Meetings ( InDico page)

Upcoming meetings

* LHCHXSWG General meeting November 9 (Mon.) - 11 (Wed.) 2020 at CERN. NEW

Regular meetings

  • SC weekly meeting takes place every Friday 17:00-18:00. Please avoid organizing meetings during this time slot if possible.
  • Also please avoid having meetings in the morning unless no other choice, to facilitate the participation of our friends from other side of the pond.


The LHC Higgs cross-section working group ( LHCHXSWG) was created in January 2010. The aim of this group was to produce agreements within the LHC community on cross sections, branching ratios and pseudo-observables relevant to SM and MSSM Higgs boson(s). In spring 2012, the group was restructured and new subgroups were added with the goal of discussing Higgs property/measurement and BSM extensions. A further restructuring took place in 2014, when the TAC (Theory Advisory Committee) was added to the organization, and an agreement was made with CERN for local support. The TAC always includes one permanent member of the CERN theory group. The activities of the group are supervised by the Steering Committee (SC) that includes two representatives from each experiment and four representatives from the theory community. The SC members from ATLAS or CMS are appointed by each experiment after their internal selection procedures. The SC members from the Theory community are appointed by the TAC, in coordination with the SC. Four CERN Reports have been completed, "Inclusive Observables" ( CERN-2011- 002), "Differential Distributions" ( CERN-2012-002), "Higgs Properties" ( CERN-2013-004), and "Deciphering the Nature of the Higgs Sector" ( CERN-2017-002). These achievements facilitated the comparison and combination of Higgs results at LHC since the beginning of the LHC physics programme. The group continues its work to provide recommendations on theoretical predictions and methodologies on Higgs boson(s) studies to the experiments for both current and planned LHC runs. More general aspects related to non-Higgs-boson(s)-specific subjects, like global Effective Field Theories or Dark Matter model studies, will be pursued by the LHCHXSWG in coordination with other more general efforts of the LHC community.”

If you want to join the working group, please send an e-mail to working group conveners listed below. Please subscribe yourself to the mailing lists of the group.

  • CERN support for HXSWG operation: Guidelines (2014.12.19)

Green led Organization

Green led Steering Committee Members Mail

Kerstin Tackmann (DESY) (2019) Fabio Cerutti (LBNL) (2018) Roger Wolf (KIT) (2018) Andrei Gritsan (JHU) (2020) Veronica Sanz (Valencia) (2019) Robert Harlander (Aachen) (2019) Nathaniel Craig (Santa Barbara) (2018) Paolo Nason (Milano) (2019)

Green led Working Group Conveners

  • We are organized in 3 working groups.

Group TWiki Mail to conveners ATLAS CMS THEORY
Higgs XS&BR Mail Giovanni Marchiori (Paris LPNHE) (2018) Alicia Calderon (Universidad de Cantabria) (2018) John Campbell (FNAL) (2017) Fabrizio Caola (Oxford) (2017)
Higgs Properties Mail Marco Delmastro (Annecy LAPP) (2018) Predrag Milenovic (Belgrade) (2019) Jorge de Blas (Padova) (2019) Giuliano Panico (Firenze) (2019)
BSM Higgs Mail Anna Goussiou (Seattle) (2018) David Sperka (Boston University) (2018) Zhen Liu (Univ. of Maryland) (2019) Pietro Slavich (LPTHE) (2017)
  • Remove SPAMNOT from mailing address when sending.

Green led Sub-working Group / Task-force Group Conveners

Group TWiki Group Mailing List Mail to conveners ATLAS CMS THEORY
BR   Mail Daniela Rebuzzi (Pavia)   Ivica Puljak (Split)   Ansgar Denner (Würzburg) Sven Heinemeyer (IFCA) Alexander Mück (Aachen)
ggF   Mail Kathrin Becker (Freiburg)   Andrea Massironi (Northeastern U)   Bernhard Mistlberger (CERN) Emanuele Re (Annecy)  
VBF Mailing List Mail Antonio De Maria (Nanjing University)   Yacine Haddad (Imperial College)   Alexander Karlberg (Univ. of Zurich) Simon Plaetzer (University of Vienna)  
VH Mailing List Mail Carlo Pandini (CERN) Thomas Calvet (Stonybrook)   Chris Palmer (Princeton)   Ciaran Williams (Buffalo) Giancarlo Ferrera (University of Milan)  
ttH/tH Mailing List Mail Maria Moreno Llacer (IFIC / CSIC-U.Valencia)   Joshuha Thomas-Wilsker (IHEP, Beijing)   Stefano Pozzorini (Univ. of Zurich) Laura Reina (Florida State Univ.)  
bbH/bH   Mail Lei.Zhang (Freiburg)   Abdollah Mohammadi (Kansas State)   Michael Spira (PSI) Marius Wiesemann (Univ. of Zurich)  
HH Mailing List Mail Arnaud Ferrari (Uppsala)   Luca Cadamuro (Univ. of Florida)   Ramona Gröber (Padova (University and INFN)) Javier Mazzitelli (Univ. of Zurich) Milada Muehlleitner (KIT)
Fiducial, Differential and Template XS Mailing List Mail Nicolas Berger (LAPP)   Lorenzo Viliani (Firenze)   Frank Tackmann (DESY)  
Offshell   Mail Lailin Xu (Brookhaven BNL)   Ulacan Sarica (Univ. California Santa Barbara)   Nikolas Kauer (Royal Holloway) Raoul Roentsch (KIT)  
Extended Higgs Sector   Mail Lidija Zivkovic (Belgrade IP), Jana Schaarshmidt (Seattle Washington)   Raffaele Gerosa (Milano-Bicocca), Jan Steggemann (CERN)   Heather Logan (Carleton) Rui Santos (ISEL/CFTC, Lisbon) Shufang Su (Arizona)
MSSM   Mail Timothy Barklow (SLAC)   Artur Gottmann (KIT)   Stefan Liebler (KIT) Pietro Slavich (LPTHE, Paris) Michael Spira (PSI)
NMSSM   Mail Nikos Rompotis (Univ. of Liverpool)   Janek Bechtel (KIT)   Ulrich Ellwanger (LPT, Orsay) Margarete Mühlleitner (KIT) Nausheen Shah (Wayne State)
Exotic Higgs Decays   Mail (1) Lily Morvaj (Stony Brook)   Georgia Karapostoli (Univ. of California, Riverside)   Brian Shuve (Harvey Mudd) Matthias Konig (Zurich)  
MCNet   Mail     Simon Plätzer (DESY)    
PDF   Mail Joey Huston* (Michigan State)   Josh Bendavid (Caltech)   Maria Ubiali (Cambdridge) Robert Thorne (UCL) Joey Huston* (Michigan State)
ALL   Mail to all conveners              

(1)This group also has an experimental contact from LHCb: Lorenzo Sestini.

  • Remove dummy.name@SPAMNOTcernSPAMNOT.ch or SPAMNOT from mailing address when sending.
  • The address should have the prefix "lhc-higgs-" for any kind of mailing lists in our group.
  • Any TWiki page Topic name should have the prefix "LHCHXSWG" and should be created under "LHCHXSWG" Topic parent.

Green led Theory Advisory Committee

(as from July 1st 2019)

Christophe Grojean (DESY and Humboldt University) Daniel De Florian (UNSAM, Buenos Aires) Michelangelo Mangano (CERN/LPCC) Fabio Maltoni (Louvain)
Gilad Perez (Weizmann Institute) Laura Reina (Florida) Carlos Wagner (Argonne/Chicago) Giulia Zanderighi (MPI Munich)

Green led Mode of operation


One of the main purposes of the LHCHXSWG is to provide the experimental collaborations with information in various forms (reference cross sections, benchmarks, recommendations, codes,...). Normally, an expression of interest on a specific piece of information might also come from EXP sources (from analysis contact persons, from group conveners, from physics coordinators) or even from TH ones. Such requests are communicated to the WG conveners. In the following we illustrate the guidelines that should be followed to insure a correct and efficient work and communication in and out of the LHCHXSWG.

General Principles

  • Information on the activities of the LHCHXSWG is fully public, open and accessible by anybody, at any time.
  • Vertical and horizontal information flow in the LHCHXSWG should be always guaranteed.
  • Calls for action/help should be made in a public/wide and transparent way so to be accessible also from outside the LHCHXSWG.
  • Official LHCHXSWG deliverables are always subject to approval procedures before being publicly available.
  • Personal and group focused initiatives, external collaborations with other groups should be supported in the interest of the all WG and should be open.


Here below we illustrate a "normal" workflow in the WG. It is understood that in case of doubt the WG conveners should consult the SC.

1) Submission of the request to the WG's

The WG conveners promote and organize the activities in their groups. In addition they are the recipients of requests that can come from any internal (the SC or other WG's members) or external [ATLAS/CMS analysis contact persons, group conveners, physics coordinators or other groups (FCC, HL-LHC, BSM theorists) ] source. Each activity/request is first considered and, if relevant, clearly defined. If the request is deemed relevant but not-yet-feasible is proposed as an addition to an official LHCHXSWG wish-list. A priority grading might be given. Such proposals are communicated to the SC (and in case to other WG's conveners) during the regular meetings (or via e-mail) and approved together with the other WG conveners.

2) Publication of the activity and call to the LHCHXSWG

WG conveners publish the approved activities (and/or the corresponding call-for-action) on the corresponding Wiki page, with a description of the work to be done, expected type of contributions and the approximated schedule (including a deadline for committing to contribute) and take corresponding actions to gather all the needed expertise from the community. People willing to contribute manifest their interest to the WG conveners. Depending on the exact request, deliverables are also identified (e.g. tables of numbers to be published on the wiki, codes to be made public, lists of available results/codes, documents to appear on the arXiv, ...).

3) Work is performed

The WG conveners organize the work and collect the results and deliverables. Intermediate status reports can be given upon the SC request and/or appear on the Twiki of the corresponding WG. Open discussions/meetings are regularly scheduled.

4) Approval of the results

Once results and/or information that answer to the request is available, WG conveners inform the SC (typically in the usual SC-WG convener meetings) who either might approve it directly or start an approval procedure, the details of which will depend on the actual deliverable. For example, in the case of a document to appear on the arXiv in the name of the LHCHXSWG (as a whole or by a WG or by smaller groups), a WG-wide (yet light) review procedure will take place.

5) Publication of the results

Report type could be either of the following,

a) LHCHXSWG internal note: such as work review or work plan as an internal document. Authors will submit the draft to the WG conveners that will oversee the document by a fast review and after approval will provide an INT preprint number. The note will be labelled like LHCHXSWG-INT-2015-001 and will be signed by the (few) individuals who have done the work. Internal notes are not intended to become public beyond the LHCHXSWG twiki page and a CDS entry and, in particular, submission to the arXiv of internal notes is strongly discouraged.

b) LHCHXSWG official report: such as (interim) recommendation which can be cited by the collaboration in the papers, proceedings/reports representing LHCHXSWG. The authors will submit the draft to the WG conveners that within a few days will post it on the twiki page and invite all members of the corresponding WG to comment (via CERN CDS system), review and eventually join the work. Final review is performed by SC members and all LHCHXSWG members are invited to comment via the CDS system during a period fixed by the SC and adjusted to the complexity of the content and the length of the note. The report should be labelled like LHCHXSWG-2015-001 and will include the endorsement “work done on behalf of the LHCHXSWG”. Everyone who has substantially contributed to the discussion or has responded to the call from the WG conveners will be invited to sign it. Official reports can be submitted to the arXiv.

c) LHCHXSWG CERN Reports: compilation of all works done in the group. Compilation and review of the different sections will he handled by the WG conveners and final review will be performed by the SC. Report numbers are handled by CERN Library like CERN-2015-001. The report will be signed by all members of the LHCHXSWG that contributed. LHCHXSWG CERN reports will be submitted to the arXiv.

Practical Issues/Recommendations about Internal Notes

- For the report number WG conveners are eligible and responsible to submit the sequential number to the authors and edit LHCHXSWG Library page themselves https://twiki.cern.ch/twiki/bin/view/LHCPhysics/LHCHXSWGLibrary This page is linked from LHCHXSWG's main TWiki page at "Documents and Practical Guide". WG conveners with CERN account should be able to edit this TWiki page. After submission the report number and making entry to Library TWiki page, please notify to SC.

- We wish that communications that usually occur by private emails between EXP and TH (as cross section numbers, scale recommendations, etc) end up into the form of Internal notes in order to provide the possibility of future checks and better handling the information. The internal notes don’t need to have the format of a formal article, can, for example, be a more informal report on the discussion.

-Internal notes could be the starting point towards an official report. For instance, the WG conveners could decide to elaborate on an internal note and call for an extended work inside their WG to issue some official recommendations. Of course, the authors of an internal note could themselves motivate/convince the WG to go for such a call.

- We encourage ATLAS/CMS to rely on official notes and if they want to use some results in INT notes, they should contact the WGi conveners such that a call is made inside the WG and the process for the transmutation INT note -> official report is initiated

- Please make sure that all notes are placed under SVN system with each directory for both INT note (LHCHXSWG-INT-2015-001) and official reports (LHCHXSWG-2015-001). All SVN instructions are linked from https://twiki.cern.ch/twiki/bin/view/LHCPhysics/LHCHXSWG#Documents_and_Practical_Guide.

The announcement of new developments in the TH/MC/Tools

"The announcement of new developments in the TH/MC/Tools can be posted on the dedicated Wiki page if the authors consider it relevant for the all LHCHXSWG groups. The MCnet contact person supervises the corresponding Wiki page and its maintenance. The submission of the news through LHCHXSWG e-mail lists should be avoided.”

Green led Exchange of non-sensitive experimental information between experiment and theory

For the LHC HXSWG it is important that Monte Carlo (MC) information, even after detector simulation and with simple kinematic selections applied, may be exchanged between experiment and theory. This information must be non-controversial within the experiments and not compromise their independence. After feedback from the experiments we have defined the following rules in this respect:

Every figure or numerical information that is supposed to be used or shown in a public document, during a workshop, or a working group meeting requires sign-off by the corresponding collaboration. This also applies if only generator information and no detector simulation were used, as long as the MC is used within (and with the corresponding setup of) the collaboration.

For written documents, like e.g. notes on arxiv, the collaboration will have to prepare a short document to be circulated among all collaborators for comments and make this document public as well, to provide an official statement by the experiment. Usually such documents include the figures in question, captions that explain what is shown, and potentially some more text to give more specific information, e.g. how exactly a plot has been created. These documents can usually be published on a track of a few weeks. There can be cases though where more discussion within the collaborations may be required.

There can be a light approval for distributions/information only based on MC and meant to be shown on slides in meetings only. This consists of a sign-off by the Higgs conveners and physics coordination (PC) of the experiments. Depending on the content, the experiments may require an internal approval procedure as described in (2) for notice within the whole collaboration, for three days before approval.

The light approval ideally should be requested 1-2 weeks before the plots are meant to be shown in public, to give the experiments time to react.

Private discussions between a limited number of experimentalists and theorists, who would like to exchange material prior to such an approval, e.g. in preparation of a meeting, are allowed. If you plan such a private discussion, people should bring up the case with the corresponding experimental contact of the WG, so that the boundary conditions can be defined. These conditions include e.g.:

  • exchange only of generator information (potentially including detector simulation);
  • application of simple and well physics-motivated kinematic and/or topological selections;
  • information exchange for a confined and well defined purpose and finite time span.

It should be understood that such exchanges are meant to be private and in the small circle of people involved in the specific purpose. The experimental contact of the WG should always be kept in the loop for such exchanges. Once the studies conclude and will be presented in public rules (1)-(4) apply. Two hypothetical examples are given in (*).

In case of remaining questions please contact the SC directly for further advice.

As follow up of ATLAS or CMS showing a pT distribution with some modeling problems in a meeting, theory colleagues ask for a MC generator level rapidity plot with the same selection, or for the same plot, but after applying some more restrictive generator selection or after changing some generator settings. This type of information can and should be exchanged. After solving the issue, new material illustrating the solution should be approved following rules (1)-(4).

For the discussion of an identified MC issue with experimental material that falls under (1)-(4) in some future meeting, the plots showing the issue can be exchanged with a few colleagues (e.g. generator authors) to ensure that the right type of information is presented in order to ensure an effective discussion.

Higgs cross sections and decay branching ratios

Orange led Production cross sections and decay BRs for RUN-2

Orange led SM Higgs

Orange led BSM Higgs

Orange led Latest plots

Figure 1: Standard Model Higgs boson production cross sections at Ecm = 13 and 14 TeV as a function of Higgs boson mass and Higgs boson production cross sections as a function of the centre-of-mass-energies. The tH production cross section accounts for t-ch and s-ch only (no tWH production) [CERN Yellow Report 4].

Figure 2: Higgs boson production cross sections (SM-like coupling, NWA, no EW corrections) at Ecm = 13 and 14 TeV [CERN Yellow Report 4].

Figure 3: Standard Model Higgs boson decay branching ratios [CERN Yellow Report 4].

Figure 4: Standard Model Higgs boson decay branching ratios and total width [CERN Yellow Report 3].

Documents and Practical Guide

Aqua led Documentation

  1. LHC XS group Library
  2. Link to CDS
  3. Generator setups used * Development only*

Aqua led CERN Reports: Handbook of LHC Higgs Cross Sections

  1. Inclusive Observables ( CERN-2011-002, arXiv:1101.0593).
  2. Differential Distributions ( CERN-2012-002, arXiv:1201.3084).
  3. Higgs Properties ( CERN-2013-004, arXiv:1307.1347).
  4. Deciphering the Nature of the Higgs Sector ( CERN-2017-002, arXiv:1610.07922).

Aqua led gitlab, SVN and CDS

LHC H XS WG gitlab Sort

Information on the old SVN (not to be used any longer):

SVN Information Sort WebSVN Sort
CDS Information CDS Collection
Instruction for CERN Yellow Report

Aqua led Communication Tools

How to get CERN Account CERN Account How to manage CERN computing account.
InDico InDico Agenda Group's workshop and subgroup meeting agenda system.

Aqua led Mailing List

  • The address should have the prefix "lhc-higgs-" for any kind of mailing lists in our group.
  • Posting the message is restricted to e-Group member lhc-higgs, i.e. you need to use your e-mail account registered to lhc-higgs mailing list.

  address alias  
General lhc-higgs@SPAMNOTcern.ch   For group's common issues, like announcement of group meeting, meeting summary etc.
Can send message to this list from lhc-higgs subscribers. Archived message.
WG1: Higgs XS&BR lhc-higgs-xsbr@SPAMNOTcern.ch lhc-higgs-wg1@SPAMNOTcern.ch WG1: Higgs XS&BR general mailing list. Archived message.
Can send message to this list from this WG1 or lhc-higgs subscribers.
Inherited from previous lhc-higgs mailing list.
WG2: Higgs Properties lhc-higgs-properties@SPAMNOTcern.ch lhc-higgs-wg2@SPAMNOTcern.ch WG2: Higgs Properties general mailing list. Archived message.
Can send message to this list from this WG2 or lhc-higgs subscribers.
Inherited from previous lhc-higgs-lm mailing list.
WG3: BSM Higgs lhc-higgs-bsm@SPAMNOTcern.ch lhc-higgs-wg3@SPAMNOTcern.ch WG3: BSM Higgs general mailing list. Archived message.
Can send message to this list from this WG3 or lhc-higgs subscribers.
Inherited from previous lhc-higgs-hm mailing list.
Steering Committee lhc-higgs-steering-committee@SPAMNOTcern.ch lhc-higgs-sc@SPAMNOTcern.ch For Steering Committee members (restricted access).
Can send message to this list from lhc-higgs subscribers.
WG1 Convener lhc-higgs-xsbr-convener@SPAMNOTcern.ch lhc-higgs-wg1-convener@SPAMNOTcern.ch For WG1 conveners (restricted access).
Can send message to this list from WG1 or lhc-higgs subscribers.
WG2 Convener lhc-higgs-properties-convener@SPAMNOTcern.ch lhc-higgs-wg2-convener@SPAMNOTcern.ch For WG2 conveners (restricted access).
Can send message to this list from WG2 or lhc-higgs subscribers.
WG3 Convener lhc-higgs-bsm-convener@SPAMNOTcern.ch lhc-higgs-wg3-convener@SPAMNOTcern.ch For WG3 conveners (restricted access).
Can send message to this list from WG3 or lhc-higgs subscribers.
Subgroup Convener lhc-higgs-xsbr-subgroup-convener@SPAMNOTcern.ch   For Subgroup conveners (restricted access).
Can send message to this list from lhc-higgs subscribers and others.

Aqua led Workshops

The 16th General Assembly Meeting at CERN 2019 Oct. 16-18, 2019 Home page Agenda  
The 15th General Assembly Meeting at CERN 2018 Dec. 10-12, 2018 Home page Agenda  
The 14th General Assembly Meeting at CERN 2018 Mar. 26-27, 2018 Home page Agenda  
The 13th General Assembly Meeting at CERN 2017 Jul. 13-14, 2017 Home page Agenda  
The 12th General Assembly Meeting at CERN 2016 Oct. 12-14, 2016 Home page Agenda  
Preparatory Meeting July 7-8, 2016 Home page Agenda  
The 11th General Assembly Meeting at CERN 2016 Jan. 13-15, 2016 Home page Agenda  
The 10th General Assembly Meeting at CERN 2015 July 15-17, 2015 Home page Agenda  
The 9th General Assembly Meeting at CERN 2015 January 22-24, 2015 Home page Agenda  
The 8th General Assembly Meeting at CERN 2014 June 12-13, 2014 Home page Agenda Minutes
The 7th Workshop at CERN 2012 Dec. 5-6, 2012 Home page Agenda  
The 6th Workshop at CERN 2012 May 24-25, 2012 Home page Agenda  
The 5th Workshop at LAL 2011 Nov. 21-22, 2011 Home page Agenda  
The 4th Workshop at BNL 2011 May 4-6, 2011 Home page Agenda  
The 3rd Workshop at Bari 2010 Nov. 4-5, 2010 Home page Agenda  
The 2nd Workshop at CERN 2010 Jul. 5-6, 2010 Home page Agenda Minutes
Inauguration Workshop in Freiburg 2010 Apr. 12-13, 2010 Home page Agenda Minutes

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formatxlsx Higgs_XSBR_YR4_update.xlsx r7 r6 r5 r4 r3 manage 1241.9 K 2017-01-27 - 19:30 ReiTanaka Higgs XS&BR Update (CERN Report 4, 2016)
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