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LHCHXSWG Internal Note

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2024-12-03
13:23
Higgs production via vector-boson fusion at the LHC / Barone, Gaetano (Brown University (US)) ; Chen, Jiayi (Simon Fraser University (CA)) ; Ferrario Ravasio, Silvia (CERN) ; Pellen, Mathieu (University of Freiburg (DE))
In this article, we summarise the recent experimental measurements and theoretical work on Higgs-boson production via vector-boson fusion at the LHC. Along with this, we provide state-of-the-art predictions at fixed order as well as with parton-shower cor- rections within the Standard Model. [...]
LHCHWG-INT-2024-002.- Geneva : CERN, 2024 - MULT.P.

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2024-01-09
09:50
Benchmark Lines and Planes for Higgs-to-Higgs Decays in the NMSSM / Ellwanger, Ulrich Bernhard (Université Paris-Saclay (FR)) ; Muhlleitner, Margarete (Karlsruhe Institute of Technology) ; Rompotis, Nikolaos (University of Liverpool (GB)) ; Winterbottom, Daniel (Imperial College (GB)) ; Shah, Nausheen (Wayne State University)
A number of benchmark scenarios for NMSSM Higgs boson searches via Higgs-to- Higgs decays at the LHC have been proposed by the NMSSM Subgroup of the LHC HWG3. Some of them are already in use by the ATLAS and CMS collaborations for the interpretation of their results from Run 2. [...]
LHCHWG-INT-2024-001.- Geneva : CERN, 2024 addressing comments from circulation: PDF;

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2017-10-26
10:59
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 parameters 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-INT-2017-001.- Geneva : CERN, 2017 - 20. Fulltext: PDF;

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2016-04-01
10:09
A morphing technique for signal modelling in a multidimensional space of coupling parameters / Brenner, Lydia (Nikhef National institute for subatomic physics (NL)) ; Belyaev, Nikita (National Research Nuclear University MEPhI (RU)) ; Bortolotto, Valerio (The Chinese University of Hong Kong (HK)) ; Burgard, Carsten Daniel (Albert-Ludwigs-Universitaet Freiburg (DE)) ; Duehrssen-Debling, Michael (CERN) ; Ecker, Katharina Maria (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (DE)) ; Gadatsch, Stefan (CERN) ; Gray, Dylan Shawn (New York University (US)) ; Kaluza, Adam (Johannes-Gutenberg-Universitaet Mainz (DE)) ; Koeneke, Karsten (Albert-Ludwigs-Universitaet Freiburg (DE)) et al.
This note describes a morphing method that produces signal models for fits to data in which both the event yields and kinematic distributions are simultaneously taken into account. The signal model is morphed in a continuous manner through the available multi-dimensional parameter space. [...]
LHCHXSWG-INT-2016-004.- Geneva : CERN, 2016 Fulltext: PDF;

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2016-03-09
16:32
New Physics in a Dimension-6 Lagrangian
LHCHXSWG-INT-2016-003.- Geneva : CERN, 2016

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2016-03-07
15:22
Higgs cross section at N3LO+N3LL / Bonvini, Marco (University of Oxford (GB)) ; Marzani, Simone (University at Buffalo)
We consider the inclusive production of a Higgs boson in gluon gluon fusion and we study the impact of threshold resummation at next-to-next-to-next-to-leading logarithmic accuracy (N3LL) on the recently computed fixed-order prediction at next-to-next-to-next-to-leading order (N3LO). In order to facilitate comparisons with other studies, we focus on the rescaled large-mt effective theory (rEFT). [...]
LHCHXSWG-INT-2016-002.- Geneva : CERN, 2016 - 16. Fulltext: PDF; External links: TROLL; ggHiggs

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2016-02-10
00:08
Analytical parametrization and shape classification of anomalous HH production in EFT approach / Carvalho Antunes De Oliveira, Alexandra (Universita e INFN, Padova (IT)) ; Dall'Osso, Martino (Universita e INFN, Padova (IT)) ; De Castro Manzano, Pablo (Universita e INFN, Padova (IT)) ; Dorigo, Tommaso (Universita e INFN, Padova (IT)) ; Goertz, Florian (CERN) ; Gouzevitch, Maxime (Universite Claude Bernard-Lyon I (FR)) ; Tosi, Mia (CERN)
In this document we study the effect of anomalous Higgs boson couplings on non-resonant pair production of Higgs bosons (HH) at the LHC. We explore the space of the five parameters $\kappa_{\lambda}$, $\kappa_{t}$, $c_2$, $c_g$, and $c_{2g}$ in terms of the corresponding kinematics of the final state, and describe a suggested partition of the space into a limited number of regions featuring similar phenomenology in the kinematics of HH final state, along with a corresponding set of representative benchmark points. [...]
LHCHXSWG-INT-2016-001.- Geneva : CERN, 2016 - 20. Fulltext: PDF;

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2015-08-28
09:22
Standard Model input parameters for Higgs physics / Denner, Ansgar (Bayerische Julius Max. Universitaet Wuerzburg (DE)) ; Dittmaier, Stefan (Albert-Ludwigs-Universitaet Freiburg (DE)) ; Grazzini, Massimiliano (Universitaet Zuerich (CH)) ; Harlander, Robert Valentin (Bergische Universitaet Wuppertal (DE)) ; Thorne, Robert Samuel (University of London (GB)) ; Spira, Michael (Paul Scherrer Institut (CH)) ; Steinhauser, Matthias (KIT Karlsruhe (DE))
This note summarises the Standard Model input parameters for Higgs cross section calculations. The same parameters can be used for other SM and BSM processes at the LHC..
LHCHXSWG-INT-2015-006.- Geneva : CERN, 28 - 4. Fulltext: PDF;

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2015-06-03
15:02
Pseudo-observables / Tinoco Mendes, Andre (CERN) ; Duehrssen-Debling, Michael (CERN) ; Isidori, Gino (Universitaet Zuerich (CH)) ; Falkowski, Adam (Universite de Paris-Sud 11)
Initial draft for note on POs
LHCHXSWG-INT-2015-005.- Geneva : CERN, 2015 Fulltext: PDF;

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2015-03-27
09:25
Benchmark scenarios for low $\tan\beta$ in the MSSM
The run-1 data taken at the LHC in 2011 and 2012 have led to strong constraints on the allowed parameter space of the MSSM. These are imposed by the discovery of an approximately SM-like Higgs boson with a mass of $125.09\pm0.24$~GeV and by the non-observation of SUSY particles or of additional (neutral or charged) Higgs bosons. [...]
LHCHXSWG-INT-2015-004.- Geneva : CERN, 27 Fulltext: PDF;

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