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LHCHXSWG Official Report

Ultimi arrivi:
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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2019-03-27
12:46
Recommended predictions for the boosted-Higgs cross section / Becker, Kathrin (Albert Ludwigs Universitaet Freiburg (DE)) ; Caola, Fabrizio (University of Durham (GB)) ; Massironi, Andrea (CERN) ; Mistlberger, Bernhard (Massachusetts Inst. of Technology (US)) ; Monni, Pier (CERN) ; Chen, Xuan (Zurich U.) ; Frixione, Stefano (INFN e Universita Genova (IT)) ; Gehrmann, Thomas Kurt (Universitaet Zuerich (CH)) ; Glover, Nigel (IPPP Durham) ; Hamilton, Keith Murray (University of London (GB)) et al.
In this note we study the inclusive production of a Higgs boson with large transverse momentum. We provide a recommendation for the inclusive cross section based on a combination of state of the art QCD predictions for the gluon-fusion and vector-boson-fusion channels. [...]
LHCHXSWG-2019-002.- Geneva : CERN, 2019 - 14. Revised upload with LHCHXSWG stamp and acknowledgements: PDF;

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2019-03-01
22:49
Higgs boson cross sections for the high-energy and high-luminosity LHC: cross-section predictions and theoretical uncertainty projections / Calderon Tazon, Alicia (Universidad de Cantabria and CSIC (ES)) ; Caola, Fabrizio (University of Durham (GB)) ; Campbell, John (Fermilab (US)) ; Francavilla, Paolo (Universita & INFN Pisa (IT)) ; Marchiori, Giovanni (Centre National de la Recherche Scientifique (FR)) ; Becker, Kathrin (Albert Ludwigs Universitaet Freiburg (DE)) ; Bertella, Claudia (Chinese Academy of Sciences (CN)) ; Bonvini, Marco (Sapienza Universita e INFN, Roma I (IT)) ; Chen, Xuan (Zuerich University (CH)) ; Frederix, Rikkert (Technische Universität Muenchen (DE)) et al.
This note summarizes the state-of-the-art predictions for the cross sections expected for Higgs boson production in the 27 TeV proton-proton collisions of a high-energy LHC, including a full theoretical uncertainty analysis. It also provides projections for the progress that may be expected on the timescale of the high-luminosity LHC and an assessment of the main limiting factors to further reduction of the remaining theoretical uncertainties..
LHCHXSWG-2019-001.- Geneva : CERN, 01 - 17. Fulltext: PDF;

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