533 citations · 5k across the 103 of their papers we have counts for
61 papers · 1 filter
Long-lived Higgsino pairs decaying within the LHC detectors
Francesca Borzumati, Kaoru Hagiwara, Kentarou Mawatari +2
Pair-produced long-lived lightest Higgsinos decaying within a few meters in the LHC detectors are considered. The relatively light nearly-pure Higgsino states object of this study…
Helicity amplitudes in light-cone and Feynman-diagram gauges
Junmou Chen, Kaoru Hagiwara, Junichi Kanzaki +2
Recently proposed Feynman-diagram (FD) gauge propagator for massless and massive gauge bosons is obtained from a light-cone (LC) gauge propagator, by choosing the gauge vector alon…
Quantum information and CP measurement in at future lepton colliders
Mohammad Mahdi Altakach, Priyanka Lamba, Fabio Maltoni +2
We introduce a methodology and investigate the feasibility of measuring quantum properties of tau lepton pairs in the decay at future lepton colliders. In particula…
Helicity amplitudes without gauge cancellation for electroweak processes
Junmou Chen, Kaoru Hagiwara, Junichi Kanzaki +1
In the 5-component representation of weak bosons, the first four components make a Lorentz four vector, representing the transverse and longitudinal polarizations excluding the sca…
Next-to-leading-order corrections to the Higgs strahlung process from electron-positron collisions in extended Higgs models
Masashi Aiko, Shinya Kanemura, Kentarou Mawatari
We present the cross section for with arbitrary sets of electron and boson polarizations at the full next-to-leading order in various extended Higgs models,…
Probing a degenerate-scalar scenario in a pseudoscalar dark-matter model
Sachiho Abe, Gi-Chol Cho, Kentarou Mawatari
We study a pseudoscalar dark-matter model arising from a complex singlet extension of the standard model (SM), and show that the dark-matter--nucleon scattering is suppressed when…
Probing extended Higgs sectors by the synergy between direct searches at the LHC and precision tests at future lepton colliders
Masashi Aiko, Shinya Kanemura, Mariko Kikuchi +3
We discuss a possibility that the parameter space of the two Higgs doublet model is significantly narrowed down by considering the synergy between direct searches for additional Hi…
QED and QCD helicity amplitudes in parton-shower gauge
Kaoru Hagiwara, Junichi Kanzaki, Kentarou Mawatari
We introduce photon and gluon propagators in which the scalar polarization component is subtracted systematically by making use of the BRST invariance of the off-shell vector boson…
H-COUP Version 2: a program for one-loop corrected Higgs boson decays in non-minimal Higgs sectors
Shinya Kanemura, Mariko Kikuchi, Kentarou Mawatari +2
We present the concept of H-COUP_ver 2, which evaluates the decay rates (including higher order corrections) for the Higgs boson with a mass of 125 GeV in various extended Higgs mo…
Automated simulations beyond the Standard Model: supersymmetry
Stefano Frixione, Benjamin Fuks, Valentin Hirschi +4
The MadGraph5 aMC@NLO framework aims to automate all types of leading- and next-to-leading-order-accurate simulations for any user-defined model that stems from a renormalisable La…
Proposal for the validation of Monte Carlo implementations of the standard model effective field theory
Gauthier Durieux, Ilaria Brivio, Fabio Maltoni +38
We propose a procedure to cross-validate Monte Carlo implementations of the standard model effective field theory. It is based on the numerical comparison of squared amplitudes com…
Exploring the global symmetry structure of the Higgs potential via same-sign pair production of charged Higgs bosons
Masashi Aiko, Shinya Kanemura, Kentarou Mawatari
We propose a novel process where singly charged Higgs bosons are produced in a same-sign pair via vector boson fusion at hadron colliders in two Higgs doublet models. The process d…
Full next-to-leading-order calculations of Higgs boson decay rates in models with non-minimal scalar sectors
Shinya Kanemura, Mariko Kikuchi, Kentarou Mawatari +2
We present a complete set of decay rates of the Higgs boson with the mass of 125 GeV at the full next-to-leading order in a variety of extended Higgs models; i.e., a model with an…
Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models
Shinya Kanemura, Kentarou Mawatari, Kodai Sakurai
We study associated Higgs production with a photon at electron-positron colliders, , in various extended Higgs models, such as the inert doublet model (IDM), the iner…
Loop effects on the Higgs decay widths in extended Higgs models
Shinya Kanemura, Mariko Kikuchi, Kentarou Mawatari +2
In order to identify the Higgs sector using future precision data, we calculate the partial decay widths of the discovered Higgs boson with the mass of 125 GeV into fermion pairs a…
Simplified dark matter models with a spin-2 mediator at the LHC
Sabine Kraml, Ursula Laa, Kentarou Mawatari +1
We consider simplified dark matter models where a dark matter candidate couples to the standard model (SM) particles via an -channel spin-2 mediator, and study constraints on th…
Electroweak Higgs boson production in the standard model effective field theory beyond leading order in QCD
Celine Degrande, Benjamin Fuks, Kentarou Mawatari +2
We study the impact of dimension-six operators of the standard model effective field theory relevant for vector-boson fusion and associated Higgs boson production at the LHC. We pr…
tWH associated production at the LHC
Federico Demartin, Benedikt Maier, Fabio Maltoni +2
We study Higgs boson production in association with a top quark and a boson at the LHC. At NLO in QCD, interferes with and a procedure to meaningfully separat…
A comprehensive approach to dark matter studies: exploration of simplified top-philic models
Chiara Arina, Mihailo Backović, Eric Conte +10
Studies of dark matter lie at the interface of collider physics, astrophysics and cosmology. Constraining models featuring dark matter candidates entails the capability to provide…
Les Houches 2015: Physics at TeV colliders - new physics working group report
G. Brooijmans, C. Delaunay, A. Delgado +78
We present the activities of the 'New Physics' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 1-19 June, 2015). Our report includes new physics stu…
Characterising the 750 GeV diphoton excess
Jérémy Bernon, Andreas Goudelis, Sabine Kraml +2
We study kinematic distributions that may help characterise the recently observed excess in diphoton events at 750 GeV at the LHC Run 2. Several scenarios are considered, including…
Diphoton excess in phenomenological spin-2 resonance scenarios
Antony Martini, Kentarou Mawatari, Dipan Sengupta
We provide a possible explanation of a 750 GeV diphoton excess recently reported by both the ATLAS and CMS collaborations in the context of phenomenological spin-2 resonance scenar…
Signatures of top flavour-changing dark matter
Jorgen D'Hondt, Alberto Mariotti, Kentarou Mawatari +3
We develop the phenomenology of scenarios in which a dark matter candidate interacts with a top quark through flavour-changing couplings, employing a simplified dark matter model w…
Higher-order QCD predictions for dark matter production at the LHC in simplified models with s-channel mediators
Mihailo Backović, Michael Krämer, Fabio Maltoni +3
Weakly interacting dark matter particles can be pair-produced at colliders and detected through signatures featuring missing energy in association with either QCD/EW radiation or h…