A. Grohsjean
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View article: ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $$ t\overline{t} $$ production
ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $$ t\overline{t} $$ production Open
A bstract We present an analysis of the sensitivity of current and future LHC searches for new spin-0 particles in top–anti-top-quark $$ \left(t\overline{t}\right) $$ final states, focusing on generic axion-like particles (ALPs) tha…
View article: LHC EFT WG note: SMEFT predictions, event reweighting, and simulation
LHC EFT WG note: SMEFT predictions, event reweighting, and simulation Open
This note provides a comprehensive overview of tools for predicting observables in the Standard Model effective field theory (SMEFT) at both tree level and one loop using event generators. We evaluate three primary methodologies–event rewe…
View article: LHC EFT WG Note: SMEFT predictions, event reweighting, and simulation
LHC EFT WG Note: SMEFT predictions, event reweighting, and simulation Open
This note gives an overview of the tools for predicting expectations in the Standard Model effective field theory (SMEFT) at the tree level and one loop available through event generators. Methods of event reweighting, the separate simulat…
View article: Event generators for high-energy physics experiments
Event generators for high-energy physics experiments Open
We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. …
View article: Dark Higgs bosons at colliders
Dark Higgs bosons at colliders Open
The Large Hadron Collider (LHC) has confirmed the Higgs mechanism to generate mass in the Standard Model (SM), making it attractive also to consider spontaneous symmetry breaking as the origin of mass for new particles in a dark sector ext…
View article: Focus topics for the ECFA study on Higgs / Top / EW factories
Focus topics for the ECFA study on Higgs / Top / EW factories Open
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define…
View article: Distinguishing Axion-Like Particles and 2HDM Higgs bosons in $t \bar{t}$ production at the LHC
Distinguishing Axion-Like Particles and 2HDM Higgs bosons in $t \bar{t}$ production at the LHC Open
We present an analysis of the sensitivity of LHC searches for new spin-0 particles produced via gluon-fusion and decaying into top-antitop-quark ($t\bar{t}$) final states to generic axion-like particles (ALPs) coupled to top-quarks and glu…
View article: A new LHC search for dark matter produced via heavy Higgs bosons using simplified models
A new LHC search for dark matter produced via heavy Higgs bosons using simplified models Open
A bstract Searches for dark matter produced via scalar resonances in final states consisting of Standard Model (SM) particles and missing transverse momentum are of high relevance at the LHC. Motivated by dark-matter portal models, most ex…
View article: Dark Higgs Bosons at Colliders
Dark Higgs Bosons at Colliders Open
The Large Hadron Collider (LHC) has confirmed the Higgs mechanism to be responsible for generating mass in the Standard Model (SM), making it attractive to also consider spontaneous symmetry breaking as the origin of mass for new particles…
View article: A new LHC search for dark matter produced via heavy Higgs bosons using simplified models
A new LHC search for dark matter produced via heavy Higgs bosons using simplified models Open
Searches for dark matter produced via scalar resonances in final states consisting of Standard Model (SM) particles and missing transverse momentum are of high relevance at the LHC. Motivated by dark-matter portal models, most existing sea…
View article: Dark Matter Searches with Top Quarks
Dark Matter Searches with Top Quarks Open
Collider signatures with top quarks provide sensitive probes of dark matter (DM) production at the Large Hadron Collider (LHC). In this article, we review the results of DM searches in final states with top quarks conducted by the ATLAS an…
View article: Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations
Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations Open
View article: Event Generators for High-Energy Physics Experiments
Event Generators for High-Energy Physics Experiments Open
We provide an overview of the status of Monte-Carlo event generators for high-energy particle physics. Guided by the experimental needs and requirements, we highlight areas of active development, and opportunities for future improvements. …
View article: Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at $$ \sqrt{s} $$ = 13 TeV
Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at $$ \sqrt{s} $$ = 13 TeV Open
View article: HL-LHC Computing Review Stage-2, Common Software Projects: Event Generators
HL-LHC Computing Review Stage-2, Common Software Projects: Event Generators Open
This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group (WG), as an input to the second phase of the LHCC review of High-Luminosity LHC (HL-LHC) computing, which is due to take place in Novem…
View article: HL-LHC Computing Review Stage-2, Common Software Projects: Event Generators
HL-LHC Computing Review Stage-2, Common Software Projects: Event Generators Open
This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group (WG), as an input to the second phase of the LHCC review of High-Luminosity LHC (HL-LHC) computing, which is due to take place in Novem…
View article: HL-LHC Computing Review: Common Tools and Community Software
HL-LHC Computing Review: Common Tools and Community Software Open
Common and community software packages, such as ROOT, Geant4 and event generators have been a key part of the LHC's success so far and continued development and optimisation will be critical in the future. The challenges are driven by an a…
View article: Report on 1912.05451v2
Report on 1912.05451v2 Open
First released in 2010, the Rivet library forms an important repository for analysis code, facilitating comparisons between measurements of the final state in particle collisions and theoretical calculations of those final states.We give a…
View article: Top Quark Spin and Polarization Properties in Searches for New Phenomena with the CMS Detector at the LHC
Top Quark Spin and Polarization Properties in Searches for New Phenomena with the CMS Detector at the LHC Open
In this work, a search for heavy pseudoscalar and scalar (A/H) Higgs bosons decaying to top-anti-top quark pairs ($t
View article: Report on 1912.05451v2
Report on 1912.05451v2 Open
First released in 2010, the Rivet library forms an important repository for analysis code, facilitating comparisons between measurements of the final state in particle collisions and theoretical calculations of those final states.We give a…
View article: LHC Dark Matter Working Group: Next-generation spin-0 dark matter models
LHC Dark Matter Working Group: Next-generation spin-0 dark matter models Open
Dark matter (DM) simplified models are by now commonly used by the ATLAS and CMS Collaborations to interpret searches for missing transverse energy ($E_T^\mathrm{miss}$). The coherent use of these models sharpened the LHC DM search program…
View article: Standard Model Physics at the HL-LHC and HE-LHC
Standard Model Physics at the HL-LHC and HE-LHC Open
The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the gian…
View article: Standard Model Physics at the HL-LHC and HE-LHC
Standard Model Physics at the HL-LHC and HE-LHC Open
The successful operation of the Large Hadron Collider (LHC) and the excellent performance of the ATLAS, CMS, LHCb and ALICE detectors in Run-1 and Run-2 with $pp$ collisions at center-of-mass energies of 7, 8 and 13 TeV as well as the gian…
View article: Dark Matter search in association with top quark pair production
Dark Matter search in association with top quark pair production Open
The existence of dark matter (DM) hints to the incompleteness of the standard model (SM). Some models feature an enhanced coupling of DM to heavier SM particles, making searches for its associated production with such particles especially …
View article: Beyond the Standard Model Physics at the HL-LHC and HE-LHC
Beyond the Standard Model Physics at the HL-LHC and HE-LHC Open
This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of…
View article: LHC Dark Matter Working Group: Next-generation spin-0 dark matter models
LHC Dark Matter Working Group: Next-generation spin-0 dark matter models Open
Dark matter (DM) simplified models are by now commonly used by the ATLAS and CMS Collaborations to interpret searches for missing transverse energy ($E_T^\mathrm{miss}$). The coherent use of these models sharpened the LHC DM search program…
View article: Search for dark matter production at ATLAS and CMS
Search for dark matter production at ATLAS and CMS Open
View article: Constraining new physics through the $t\bar{t}$ spin density matrix
Constraining new physics through the $t\bar{t}$ spin density matrix Open
The negative results obtained by searches for heavy new resonances are excluding ever more of the potential phase space where they could be directly produced at the LHC, hinting that they might be out of reach given our current facilities.…
View article: Hunting the dark Higgs
Hunting the dark Higgs Open
View article: Towards the next generation of simplified Dark Matter models
Towards the next generation of simplified Dark Matter models Open
This White Paper is an input to the ongoing discussion about the extension and refinement of simplified Dark Matter (DM) models. It is not intended as a comprehensive review of the discussed subjects, but instead summarises ideas and conce…