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CERN Accelerating science

LHCHXSWG Official Report

Letzte Einträge:
2024-01-10
14:49
Ad interim recommendations for the Higgs boson production cross sections at $\sqrt{s} = 13.6$ TeV / Karlberg, Alexander (CERN) ; Malcles, Julie (Université Paris-Saclay (FR)) ; Mistlberger, Bernhard (SLAC National Accelerator Laboratory (US)) ; Di Nardo, Roberto (Universita e INFN Roma Tre (IT)) ; Jones, Stephen Philip (University of Durham (GB)) ; Abidi, Haider (Brookhaven National Laboratory (US)) ; Ferrario Ravasio, Silvia (CERN) ; Pellen, Mathieu (Albert Ludwigs Universitaet Freiburg (DE)) ; Barone, Gaetano (Brown University (US)) ; Cooperstein, Stephane Brunet (Univ. of California San Diego (US)) et al.
This note documents predictions for the production cross sections of the Standard Model Higgs boson at the Large Hadron Collider at a centre of mass energy of 13.6 TeV. The predictions here are based on simple extrapolations of previously documented predictions published in the CERN Yellow Report ”Deciphering the Nature of the Higgs Sector”. [...]
arXiv:2402.09955; LHCHWG-2024-001.- Geneva : CERN, 2024 - 13 p. Fulltext: PDF; Updated PDF following discussions before final approval: PDF;

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2022-12-07
11:02
Effective Field Theory descriptions of Higgs boson pair production / Gröber, Ramona (Dipartimento di Fisica e Astronomia "G.Galilei", Università di Padova and INFN, Sezione di Padova, 35131 Padova, Italy) ; Alasfar, Lina (Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany) ; Cadamuro, Luca (Université Paris-Saclay (FR)) ; Dimitriadi, Christina (University of Bonn (DE)) ; Ferrari, Arnaud (Uppsala University (SE)) ; Heinrich, Gudrun Marlen (KIT - Karlsruhe Institute of Technology (DE)) ; Ingebretsen Carlson, Tom (Stockholm University (SE)) ; Lang, Jannis (Institute for Theoretical Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany) ; Ordek, Serhat (Uppsala University (SE)) ; Pereira Sanchez, Laura (Stockholm University (SE)) et al.
Higgs boson pair production is traditionally considered to be of particular interest for a measurement of the trilinear Higgs self-coupling. Yet it can offer insights into other couplings as well, since - in an effective field theory (EFT) parameterisation of potential new physics - both the production cross section and kinematical properties of the Higgs boson pair depend on various other Wilson coefficients of EFT operators. [...]
LHCHWG-2022-004.- Geneva : CERN, 2022 - 38. LHC Higgs WG note: PDF;

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2022-06-13
16:33
Study of $t\bar{t}b\bar{b}$ and $t\bar{t}W$ background modelling for $t\bar{t}H$ analyses / Ferencz, Lars (Deutsches Elektronen-Synchrotron (DE)) ; Grevtsov, Kirill (DESY) ; Katzy, Judith (Deutsches Elektronen-Synchrotron (DE)) ; Knue, Andrea Helen (Albert Ludwigs Universitaet Freiburg (DE)) ; Van Der Linden, Jan (KIT - Karlsruhe Institute of Technology (DE)) ; McFayden, Josh (University of Sussex (GB)) ; Monig, Gianna (University of Sussex (GB)) ; Pfeffer, Emanuel Lorenz (KIT - Karlsruhe Institute of Technology (DE)) ; Saibel, Andrej (Univ. of Valencia and CSIC (ES)) ; Schroeder, Matthias (Hamburg University (DE)) et al.
This note presents Monte Carlo generator comparisons of the $t\bar{t}b\bar{b}$ and $t\bar{t}W$ processes at particle level. The aim is to compare the modelling of important backgrounds to $t\bar{t}H$ measurements in multi-lepton final states and in the $t\bar{t}H (H \to b\bar{b})$ decay channel and the treatment of the associated theory uncertainties for a combination of the full Run-2 $t\bar{t}H$ results from ATLAS and CMS. [...]
LHCHWG-2022-003.- Geneva : CERN, 18 - 40. Fulltext: PDF;

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2022-03-11
09:29
Modelling of the single-Higgs simplified template cross-sections (STXS 1.2) for the determination of the Higgs boson trilinear self-coupling / Monti, Fabio (Chinese Academy of Sciences (CN)) ; Pandini, Carlo Enrico (Nikhef National institute for subatomic physics (NL)) ; Lucio Alves, Fabio Lucio (Nanjing University (CN)) ; Yang, Hongtao (University of Science and Technology of China (CN)) ; Huang, Yanping (Chinese Academy of Sciences (CN)) ; Wang, Jin (Chinese Academy of Sciences (CN)) ; Langford, Jonathon Mark (Imperial College (GB)) ; Ran, Kunlin (Chinese Academy of Sciences (CN)) ; Donega, Mauro (ETH Zurich (CH)) ; Chen, Mingshui (Chinese Academy of Sciences (CN)) et al.
The trilinear self-coupling constant of the Higgs boson $\lambda$ can be determined via the measurement of the cross sections of the main Higgs boson production mechanisms (single-H). Such cross sections receive a $\lambda$ dependence from next-to-leading order electroweak corrections. [...]
LHCHWG-2022-002.- Geneva : CERN, 2022 Fulltext: PDF;

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2022-02-17
17:52
Off-shell Higgs Interpretations Task Force : Models and Effective Field Theories Subgroup Report / Azatov, Aleksandr (SISSA, Trieste ; INFN, Trieste) ; Falkowski, Adam (U. Paris-Saclay ; CNRS, France ; Paris, IN2P3 ; IJCLab, Orsay) ; Gritsan, Andrei V. (Johns Hopkins U.) ; Grojean, Christophe (DESY ; Humboldt U., Berlin) ; Kauer, Nikolas (Royal Holloway, U. of London) ; Salvioni, Ennio (Padua U. ; INFN, Padua) ; Thomas, Marion (Manchester U.) ; Vryonidou, Eleni (Manchester U.) ; Kang, Lucas (Johns Hopkins U.) ; de Blas, Jorge (CAFPE, Granada) et al.
This report presents the results of the Models and Effective Field Theories Subgroup of the Off-Shell Interpretations Task Force in the LHC Higgs Working Group. The main goal of the subgroup was to discuss and advance the potential impact of off-shell Higgs measurements on searches for BSM physics carried out in the EFT framework or as benchmark model studies. [...]
LHCHWG-2022-001.- Geneva : CERN, 16 - 54 p. - Published in : 10.17181/LHCHWG-2022-001 Fulltext: PDF;

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2021-12-01
19:40
Benchmark Scenarios for MSSM Higgs Boson Searches at the LHC / Bagnaschi, Emanuele Angelo (Universita e INFN Roma Tre (IT)) ; Heinemeyer, Sven (Universidad Autonoma de Madrid (ES)) ; Liebler, Stefan (Institute for Theoretical Physics (ITP), Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany) ; Slavich, Pietro (Centre National de la Recherche Scientifique (FR)) ; Spira, Michael (Paul Scherrer Institute (CH))
A number of benchmark scenarios for MSSM Higgs boson searches at the LHC have been proposed in recent years, and some of them are already in use by the ATLAS and CMS collaborations for the interpretation of their results from Run 2. The LHC Higgs Working Group provides a set of ROOT files that contain the numerical predictions for masses, branching ratios and production cross sections in these scenarios, relying on state-of-the art calculations implemented in public codes. [...]
LHCHWG-2021-001.- Geneva : CERN, 2021 - 30. Fulltext: PDF;

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2019-10-18
08:57
BSM Benchmarks for Effective Field Theories in Higgs and Electroweak Physics / Marzocca, David (INFN Trieste Italy) ; Riva, Francesco (Universite de Geneve (CH)) ; Criado, J (CAFPE Granada (Spain)) ; Dawson, S (BNL (US)) ; de Blas Mateo, Jorge (Universita e INFN, Padova (IT) and Durham University (UK)) ; Henning, Brian Quinn (CERN) ; Liu, D (Argonnne (US)) ; Low, I (Argonne (US)) ; Murphy, C (BNL (US)) ; Perez-Victoria Moreno De Barreda, Manuel Maria (Universidad de Granada (ES)) et al.
Effective Field Theories (EFTs) capture effects from heavy dynamics at low en- ergy and represent an essential ingredient in the context of Standard Model (SM) precision tests. This document gathers a number of relevant scenarios for heavy physics beyond the SM and presents explicit expressions for the Wilson coeffi- cients in their low-energy EFT. [...]
LHCHXSWG-2019-006.- Geneva : CERN, 2019 LHCHXSWG-2019-006: PDF;

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2019-09-27
09:59
Higgs boson potential at colliders: status and perspectives / Di Micco, Biagio (Universita e INFN Roma Tre (IT)) ; Gouzevitch, Maxime (Centre National de la Recherche Scientifique (FR)) ; Mazzitelli, Javier (University of Zurich) ; Vernieri, Caterina (SLAC National Accelerator Laboratory (US)) ; Alison, John (Carnegie-Mellon University (US)) ; Androsov, Konstantin (INFN Sezione di Pisa, Universita' e Scuola Normale Superiore, Pisa (IT)) ; Baglio, Julien Lorenzo (CERN) ; Bagnaschi, Emanuele Angelo (Paul Scherrer Institut (CH)) ; Banerjee, Shankha (University of Durham (GB)) ; Basler, P (Karlsruhe Institute of Technology) et al.
This document summarises the current theoretical and experimental status of the di-Higgs boson production searches, and of the direct and indirect constraints on the Higgs boson self-coupling, with the wish to serve as a useful guide for the next years. The document discusses the theoretical status, including state-of-the-art predictions for di-Higgs cross sections, developments on the effective field theory approach, and studies on specific new physics scenarios that can show up in the di-Higgs final state. [...]
LHCHXSWG-2019-005.- Geneva : CERN, 27 - 213. Part 3 added: PDF;

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2019-05-10
11:18
Constraining EFT parameters using simplified template cross sections / Hays, Chris (University of Oxford (GB)) ; Sanz Gonzalez, Veronica (CERN) ; Zemaityte, Gabija (University of Oxford (GB))
We discuss a procedure for fitting a set of dimension-6 effective field theory param- eters using simplified template cross section measurements. The steps are to determine equations relating the parameters to the cross sections, choose the fit parameters and external constraints, and perform the fit. [...]
LHCHXSWG-2019-004.- Geneva : CERN, 2019 - 21. Fulltext: PDF;

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2019-04-02
20:51
Simplified Template Cross Sections – Stage 1.1 / Delmastro, Marco (Centre National de la Recherche Scientifique (FR)) ; Berger, Nicolas (Centre National de la Recherche Scientifique (FR)) ; Bertella, Claudia (Chinese Academy of Sciences (CN)) ; Duehrssen-Debling, Michael (CERN) ; Kivernyk, Oleh (Centre National de la Recherche Scientifique (FR)) ; Langford, Jonathon Mark (Imperial College (GB)) ; Milenovic, Predrag (University of Belgrade (RS)) ; Pandini, Carlo Enrico (CERN) ; Tackmann, Frank (Deutsches Elektronen-Synchrotron (DE)) ; Tackmann, Kerstin (Deutsches Elektronen-Synchrotron (DE)) et al.
Simplified Template Cross Sections (STXS) have been adopted by the LHC experiments as a common framework for Higgs measurements. Their purpose is to reduce the theoretical uncertainties that are directly folded into the measurements as much as possible, while at the same time allowing for the combination of the measurements between different decay channels as well as between experiments. [...]
arXiv:1906.02754; LHCHXSWG-2019-003; DESY-19-070.- Geneva : CERN, 2019 - 14 p. Fulltext: LHCHXSWG-2019-003 - PDF; 1906.02754 - PDF;

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