Overview Mailing Lists Meetings Organisation Steering Committee Working Groups WG1 (Higgs cross-section and branching ratios) WG2 (Higgs Properties) WG3 (BSM Higgs) HH cross-group Contacts for activities outside the Higgs Working Group Theory Advisory Committee Useful information Mode of operation - MOVE THIS SECTION TO SEPARATE PAGE WITH A LINK HERE General Principles Workflow Exchange of non-sensitive experimental information between experiment and theory Higgs cross sections and decay branching ratios - MOVE THIS SECTION TO A SEPARATE PAGE WITH A LINK HERE Production cross sections and decay BRs for Run 2 SM Higgs BSM Higgs Latest plots Documentation CERN Reports: Handbook of LHC Higgs Cross Sections Practical information Gitlab, SVN and CDS How to get a CERN account Mattermost channels Workshops

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Overview

The LHC Higgs Working Group (LHCHWG) provides 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 are pursued by the LHCHWG in collaboration with other more general efforts of the LHC community.

Four CERN Yellow Reports have been completed:

• "Inclusive Observables" ( CERN-2011- 002)
• "Differential Distributions" ( CERN-2012-002)
• "Higgs Properties" ( CERN-2013-004)
• "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 is organised into three working groups:

• WG1: Higgs cross-sections and branching ratios
• WG2: Higgs properties
• WG3: BSM Higgs

In addition, the HH cross-group covers all aspects of resonant and non-resonant double-Higgs production.

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

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Mailing Lists

All members of the working group should subscribe to the general mailing list and the mailing lists for any working groups (and subgroups) they are planning to contribute to.

• General mailing list
  • lhc-higgs@SPAMNOTcernNOSPAMPLEASE.ch
  • Use for common issues, e.g. announcement of group meetings etc.
  • Archived messages
• Event announcements
  • lhc-higgs-announcements@SPAMNOTcernNOSPAMPLEASE.ch
  • For Higgs-related announcements not directly related to the WG activities, like conferences, programs, etc.
  • Every member of the Higgs working group is welcome to (responsibly) use this list.
  • Archived messages
• Mailing lists for each working group (and subgroups) are listed in the Organisation section.
• How to subscribe to mailing lists
• Posting messages to any lhc-higgs-xxx list is restricted to members of the lhc-higgs egroup, i.e. you need to use your e-mail account registered to lhc-higgs mailing list.
• Remove "SPAMNOT" from mailing address when sending.
• Any new mailing lists should have the prefix "lhc-higgs-". Any TWiki page Topic name should have the prefix "LHCHWG" and should be created under "LHCHWG" Topic parent.

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Meetings

• Indico category
• Meeting summaries can be browsed from this page.
• The SC weekly meeting takes place every Friday 17:00-18:00. Please avoid organising meetings during this time slot if possible.
• Please make sure to take into account timezone constraints of participants in order to facilitate participation from all regions. Early afternoon in Europe is generally a good compromise to allow participants from Asia and the Americas to connect.

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Organisation

A record of the previous WG convenors and members of the steering committee is being compiled in this spreadsheet. Anyone with historical knowledge of the WG is encouraged to add missing names.

Steering Committee

Steering committee members ATLAS Karsten Koeneke Freiburg 10/2021 Katharine Leney SMU 10/2022 CMS Mauro Donega ETH 01/2023 Predrag Milenovic Belgrade 09/2021 Theory Stefania Gori UCSC 10/2021 Gudrun Heinrich KIT 11/2021 Tim Cohen CERN 01/2023 Fabrizio Caola Oxford 01/2021

The steering committee can be reached by email at lhc-higgs-steering-committee@SPAMNOTcernNOSPAMPLEASE.ch.

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Working Groups

Mailing list to contact all group and subgroup convenors: lhc-higgs-all-groups-and-subgroups-conveners@SPAMNOTcernNOSPAMPLEASE.ch

WG1 (Higgs cross-section and branching ratios)

WG1 TWiki WG1 mailing list: lhc-higgs-xsbr@SPAMNOTcern.ch WG1 convenors: lhc-higgs-xsbr-convener@SPAMNOTcern.ch

WG1 convenors ATLAS Roberto Di Nardo Roma III 12/2020 CMS Julie Malcles Univ. Paris-Saclay 12/2020 Theory Bernhard Mistlberger SLAC 07/2022 Alexander Karlberg CERN 05/2021

WG1 subgroups	Subgroup mailing list	Mail to conveners	ATLAS	CMS	Theory
ggF	Mailing list	Mail	Syed Haider Abidi, BNL (02/2021)	Jonathon Langford, Imperial College (09/2021)	Alexander Huss, CERN (09/2022)	Stephen Jones, Durham (06/2021)
VBF	Mailing List	Mail	Gaetano Barone, Brookhaven BNL (04/2022)	Stephane Cooperstein, UCSD (09/2021)	Mathieu Pellen, Freiburg (05/2021)	Silvia Ferrario Ravasio, CERN (10/2022)
VH	Mailing List	Mail	Hannah Arnold, Nikhef (10/2021)	Alessandro Calandri, ETH Zurich (01/2021)	Ciaran Williams, Buffalo (09/2019)	Giancarlo Ferrera, University of Milan (02/2019)
ttH/tH	Mailing List	Mail	Josh McFayden, Sussex (01/2021)	Sergio Sanchez Cruz, UZH (09/2021)	Malgorzata Worek RWTH Aachen (01/2022)	Marco Zaro, Milan (01/2022)
Offshell		Mail	Rafael Coelho Lopes de Sa, UMass (04/2022)	Savvas Kyriacou, JHU (09/2021)	Ennio Salvioni, Padua (10/2022)	Raoul Roentsch, Milan (09/2019)

Mailing list to contact all WG1 subgroup convenors: lhc-higgs-xsbr-subgroup-convener@SPAMNOTcernNOSPAMPLEASE.ch

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WG2 (Higgs Properties)

WG2 TWiki WG2 mailing list: lhc-higgs-properties@SPAMNOTcern.ch WG2 convenors: lhc-higgs-properties-convener@SPAMNOTcern.ch

WG2 convenors ATLAS Sarah Heim DESY 01/2023 CMS Giacomo Ortona Torino 01/2023 Theory Ken Mimasu King’s College London 07/2021 Daniele Barducci INFN / Rome - Sapienza 02/2022

WG2 subgroups Subgroup mailing list Mail to conveners ATLAS CMS Theory Fiducial, Differential and Template XS Mailing List Mail Hongtao Yang, LBNL (08/2020) Matteo Bonanomi, UHH (10/2022) Frank Tackmann, DESY (05/2017)

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WG3 (BSM Higgs)

WG3 TWiki WG3 mailing list: lhc-higgs-bsm@SPAMNOTcern.ch WG3 convenors: lhc-higgs-bsm-convener@SPAMNOTcern.ch

WG3 convenors ATLAS Chris Hayes Michigan 02/2023 CMS Abdollah Mohammadi UW-Madison 10/2021 Theory Brian Shuve Harvey Mudd 04/2022 Shufang Su Arizona 03/2021

WG3 subgroups Subgroup mailing list Mail to conveners ATLAS CMS LHCb Theory bbH/bH   Mail Tim Barklow, SLAC (01/2021) Chayanit Asawatangtrakuldee (Chulalongkorn U.) (07/2021)   Michael Spira, PSI (08/2014) Marius Wiesemann, MPI Munich (09/2014)   Extended Higgs Sector Mailing List Mail Lidija Zivkovic, Belgrade IP (2019), Nikos Rompotis, Liverpool (01/2021) Mariarosaria d'Alfonso, MIT (01/2021), Santeri Laurila, CERN (07/2021)   Tania Robens, Zagreb (02/2021) Rui Santos, ISEL/CFTC, Lisbon (2015)   MSSM   Mail Timothy Barklow, SLAC (2019) Afiq Anuar, DESY (07/2021)   Emanuele Bagnaschi, CERN (06/2020) Michael Spira, PSI (04/2012)   NMSSM   Mail Nikos Rompotis, Liverpool Daniel Winterbottom, Imperial (07/2021)   Ulrich Ellwanger, LPT, Orsay (2015) Margarete Mühlleitner, KIT Nausheen Shah, Wayne State (11/2019) Exotic Higgs Decays   Mail Verena Martinez, UMass (01/2021) Alexis Kalogeropoulos, Princeton (02/2022) Carlos Vazquez Sierra Brian Shuve, Harvey Mudd (01/2020) Matthias Konig, Zurich (01/2020)

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HH cross-group

HH TWiki HH mailing list: lhc-higgs-hh@SPAMNOTcern.ch HH convenors: lhc-higgs-hh-convener@SPAMNOTcern.ch

HH convenors ATLAS Stefano Manzoni CERN 10/2022 CMS Nan Lu Caltech 08/2021 Theory Ramona Gröber Padova (University and INFN) 06/2018 Javier Mazzitelli MPI Munich 06/2018 Margarete Muehlleitner KIT

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Contacts for activities outside the Higgs Working Group

Group TWiki	Group Mailing List	Group email to the contacts	ATLAS	CMS	Theory
BR (WG1)		Mail	Daniela Rebuzzi, Pavia (08/2014)	Ivica Puljak, Split (05/2014)	Michael Spira, PSI (10/2021)	Sven Heinemeyer, IFCA (08/2014)	Alexander Mück, Aachen (08/2014)
MCNet (Point of contact)		Mail			Simon Plätzer, Graz (09/2014)
PDF (Point of contact)		Mail	Joey Huston, Michigan State (01/2010)	Josh Bendavid, CERN	Maria Ubiali, Cambridge	Robert Thorne, UCL 0(1/2010)	Joey Huston, Michigan State
LHC EFT Working Group (Contacts)			Sarah Heim, DESY (01/2023)	Giovanni Petrucciani, CERN (10/2020)	Jorge de Blas, Granada (10/2020)

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Theory Advisory Committee

The Theory Advisory Committee (TAC) is responsible for appointing the theory members of the Steering Committee. The TAC will always include one member from the CERN Theory group. From July 1st 2019 the members of the TAC are:

• 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

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Useful information

Mode of operation - MOVE THIS SECTION TO SEPARATE PAGE WITH A LINK HERE

One of the main purposes of the LHCHWG is to provide the experimental collaborations with information in various forms (reference cross sections, benchmarks, recommendations, codes,...). An expression of interest on a specific piece of information may come from experiment of theory (e.g., analysis contact persons, group conveners, or physics coordinators). Such requests should be communicated to the conveners of the working groups WG1-WG3 (collectively referred to as "WGs" in the following). Here we illustrate the guidelines that should be followed to insure a correct and efficient work and communication.

General Principles

• Information on the activities of the LHCHWG should be fully public, open and accessible by anyone, at any time.
• Vertical and horizontal information flow in the LHCHWG should be always guaranteed.
• Calls for action or help should be made in a transparent way, accessible also from outside the LHCHWG.
• Official LHCHWG deliverables are always subject to approval procedures before being publicly available (for details, see below).
• Personal and group focused initiatives as well as external collaborations with other groups should be supported. They should be open to anyone and announced in the mailing list of the WG.

Workflow

Here we outline a "normal" workflow in the LHCHWG. It is understood that in case of doubt, the WG conveners should consult the lhc-higgs-steering-committee@SPAMNOTcernNOSPAMPLEASE.ch.

1) Submission of requests to the WGs

The conveners of the WGs promote and organize the activities in their groups. In addition, they are the contacts for requests from any internal or external source (e.g., ATLAS/CMS analysis contact persons, group conveners, physics coordinators or other groups like FCC, HL-LHC, or theorists). If the request is considered relevant by the conveners of the appropriate WG, they will define its scope and goals within the WG. If the request is deemed relevant but not-yet-feasible, the WG conveners propose it as an addition to an official LHCHWG wish-list, possibly with a priority grading. Such proposals are communicated to the SC and approved in coordination with the other WG conveners.

2) Publication of the activity and call to the LHCHWG

The WG conveners publish the approved activities (and/or the corresponding call-for-action) on their respective twiki page, with a description of the work to be done, the expected type of deliverables, 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 express 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 twiki codes to be made public, lists of available results/codes, documents to appear on the arXiv, etc.).

3). Work is performed

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

4) Approval of the results

Once results and/or information corresponding to the request is available, the WG conveners inform the SC (typically in the regular SC-WG convener meetings) who either 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 LHCHWG (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: see detailed discussion on the LHCHWG Library page.

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 LHCHWG groups. The MCnet contact person supervises the corresponding Wiki page and its maintenance. The submission of the news through LHCHWG e-mail lists should be avoided.”

Exchange of non-sensitive experimental information between experiment and theory

For the LHCHWG 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:

(1)
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.

(2)
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.

(3)
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.

(4)
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.

(5)
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.

(*)
Example-1:
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).

Example-2:
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.

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Higgs cross sections and decay branching ratios - MOVE THIS SECTION TO A SEPARATE PAGE WITH A LINK HERE

Production cross sections and decay BRs for Run 2

• Higgs cross sections and BRs in Spread sheet are available here in xlsx format.
• Instruction for Higgs Cross Section Calculation at 13/14 TeV
• Link to the previous recommendations in CERN Report 3 for Higgs XS at 13&14 TeV (link to 7&8 TeV numbers there) and XS for M_H = 125.09 GeV and BR.

SM Higgs

• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH and tH at 13, 14 and 27 TeV (HL-HE Report)
• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 7 TeV (CERN Report 4)
• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 8 TeV (CERN Report 4)
• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 13 TeV (CERN Report 4)
• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 14 TeV (CERN Report 4)
• Recommended values on SM Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH for Ecm scan (CERN Report 4)

• Recommended values on SM Higgs XS for HH production (CERN Report 4)

• Recommended values on SM Higgs BR (CERN Report 4)

BSM Higgs

• Recommended values on SM-like Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 7 TeV (CERN Report 4)
• Recommended values on SM-like Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 8 TeV (CERN Report 4)
• Recommended values on SM-like Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 13 TeV (CERN Report 4)
• Recommended values on SM-like Higgs XS for ggF, VBF, WH, ZH, ttH bbH and tH at 14 TeV (CERN Report 4)

• MSSM neutral Higgs: XS scans of the m_A-tanβ plane

Latest plots

• You can find more figures at our gallery here.
• For BSM plots, please look at each XS and BR TWiki page linked above, ex. MSSM Neutral Higgs and MSSM Charged Higgs.
• You can also find useful figures for talks/lectures at European Strategy page.

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Documentation

1. LHC Higgs WG Library
2. Link to CDS
3. Generator setups used * Development only*

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).
   • BibTeX and LaTeX citation format for CERN-2011-002 (arXiv:1101.0593), CERN-2012-002 (arXiv:1201.3084) and CERN-2013-004 (arXiv:1307.1347).
4. Deciphering the Nature of the Higgs Sector ( CERN-2017-002, arXiv:1610.07922).

Practical information

Gitlab, SVN and CDS

Gitlab	LHC H XS WG gitlab
SVN (OLD - NO LONGER IN USE)	SVN Information	WebSVN
CDS	CDS Information	CDS Collection
Yellow Reports	Instruction for CERN Yellow Report

How to get a CERN account

• How to get a CERN Account
• CERN Account |

Mattermost channels

Mattermost team "LHC Higgs WG" and channels are provided for less formal communication and discussions - members of the WG can join the this Mattermost team following this link: LHC Higgs WG team.

Each member of this team can join any of the public channels for individual working groups and HH cross-group:

• WG1
• WG2
• WG3
• HH cross-group

Workshops

The LHC Higgs Working Group workshop is held annually, usually in November or December.

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-- KatharineLeney - 2023-02-22