J. Braathen

Impact of model-independent higher-order contributions to the Higgs-boson self-couplings

Johannes Braathen, Wrishik Naskar, Georg Weiglein

We point out the relevance of a new class of model-independent higher-order contributions to the trilinear and quartic self-couplings of the detected Higgs boson giving rise to pot…

Precision predictions for trilinear scalar couplings and Higgs pair production in models with extended scalar sectors

Johannes Braathen

Reconstructing the shape of the Higgs potential realised in Nature is one of the most pressing tasks of current and future colliders. This will offer deep insights into the dynamic…

Refining two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model

Johannes Braathen, Felix Egle, Alain Verduras Schaeidt

The precise determination of the Higgs self-couplings is an essential task for understanding electroweak symmetry breaking and probing physics beyond the Standard Model (SM). The c…

Precise predictions for trilinear Higgs couplings and Higgs pair production in extended scalar sectors with anyH3 and anyHH

Henning Bahl, Johannes Braathen, Martin Gabelmann +2

A central objective of future collider experiments is to probe the structure of the Higgs potential, which requires access to trilinear scalar couplings, in particular the self-cou…

Sensitivity to new physics: single-Higgs couplings vs. the trilinear Higgs coupling

Henning Bahl, Johannes Braathen, Martin Gabelmann +4

The trilinear Higgs self-coupling provides a unique probe of the structure of the Higgs potential and of the nature of the electroweak phase transition, and constitutes a key targe…

Investigating a strong first-order electroweak phase transition in the RxSM at future linear $e^{+} e^{-}$ colliders and LISA

Johannes Braathen, Sven Heinemeyer, Carlos Pulido Boatella +1

The general real singlet extension of the Standard Model (SM), the RxSM, is one of the simplest theories Beyond-the-Standard Model (BSM) that can accommodate a strong first-order e…

physics.acc-ph2025★ 2 cited

Assessing uncertainties in the determination of the trilinear Higgs self-coupling from single-Higgs observables

Henning Bahl, Philip Bechtle, Johannes Braathen +4

Circular $e^{+} e^{-}$ colliders operating at energies below the di-Higgs production threshold can provide information on the trilinear Higgs self-coupling $λ_{hhh}$ via its loop co…

MuCol Milestone Report No. 7: Consolidated Parameters

Rebecca Taylor, Antoine Chancé, Dario Augusto Giove +459

This document is comprised of a collection of consolidated parameters for the key parts of the muon collider. These consolidated parameters follow on from the October 2024 Prelimin…

Probing the Higgs potential at a Photon Collider

Marten Berger, Johannes Braathen, Gudrid Moortgat-Pick +1

A $γ γ$ collider, either in conjunction with an $e^{+} e^{-}$ linear collider or as a stand-alone facility, offers a very attractive Higgs physics programme at relatively low centre-of-m…

physics.acc-ph2025★ 1 cited

Complementarity of gravitational wave analyses and di-Higgs production in the exploration of the Electroweak Phase Transition dynamics in the RxSM

Johannes Braathen, Sven Heinemeyer, Carlos Pulido Boatella +1

The real singlet extension of the Standard Model (SM), RxSM, is one of the simplest Beyond-the-Standard Model (BSM) theories that can accommodate a strong first-order electroweak p…

hep-ph2025★ 4 cited

Impact of one-loop corrections to trilinear scalar couplings on di-Higgs production in the RxSM

Johannes Braathen, Sven Heinemeyer, Andrea Parra Arnay +1

We investigate di-Higgs production at the (HL-)LHC and possible high-energy future $e^{+} e^{-}$ colliders within the real Higgs singlet extension of the Standard Model (SM), the RxSM.…

The Muon Collider

Carlotta Accettura, Simon Adrian, Rohit Agarwal +450

Muons offer a unique opportunity to build a compact high-energy electroweak collider at the 10 TeV scale. A Muon Collider enables direct access to the underlying simplicity of the…

physics.acc-ph2025

Design Initiative for a 10 TeV pCM Wakefield Collider

Spencer Gessner, Jens Osterhoff, Carl A. Lindstrøm +198

This document outlines a community-driven Design Study for a 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need for Advanced Accelerator R\&D, and…

hep-ex2025★ 1 cited

The Linear Collider Facility (LCF) at CERN

H. Abramowicz, E. Adli, F. Alharthi +406

In this paper we outline a proposal for a Linear Collider Facility as the next flagship project for CERN. It offers the opportunity for a timely, cost-effective and staged construc…

hep-ex2025

A Linear Collider Vision for the Future of Particle Physics

H. Abramowicz, E. Adli, F. Alharthi +446

In this paper we review the physics opportunities at linear $e^{+} e^{-}$ colliders with a special focus on high centre-of-mass energies and beam polarisation, take a fresh look at the…

Generic two-loop results for trilinear and quartic scalar self-interactions

Henning Bahl, Johannes Braathen, Martin Gabelmann +1

Reconstructing the shape of the Higgs potential realised in Nature is a central part of the physics programme at the LHC and future colliders. In this context, accurate theoretical…

hep-ph2024★ 6 cited

Probing the Inert Doublet Model via Vector-Boson Fusion at a Muon Collider

Johannes Braathen, Martin Gabelmann, Tania Robens +1

In this work, we explore the discovery potential of the Inert Doublet Model (IDM) via the vector boson fusion (VBF) channel at a muon collider with centre-of-mass energy of 10 TeV.…

Precise predictions for the trilinear Higgs self-coupling in the Standard Model and beyond

Henning Bahl, Johannes Braathen, Martin Gabelmann +1

Deviations in the trilinear self-coupling of the Higgs boson at 125 GeV from the Standard Model (SM) prediction are a sensitive test of physics Beyond the SM (BSM). The LHC experim…

New constraints on extended scalar sectors from the trilinear Higgs coupling

Henning Bahl, Johannes Braathen, Georg Weiglein

The trilinear Higgs coupling $λ_{hhh}$ is a crucial tool to probe the structure of the Higgs potential and to search for possible effects of physics beyond the Standard Model (SM).…

Experimental probes and theoretical concepts for BSM trilinear couplings: a case study for scalar top quarks

Henning Bahl, Johannes Braathen, Georg Weiglein

After the possible discovery of new particles, it will be crucial to determine the properties, and in particular the couplings, of the new states. Here, we focus on scalar trilinea…

hep-ph2023★ 11 cited

Leading two-loop corrections to the Higgs di-photon decay in the Inert Doublet Model

Masashi Aiko, Johannes Braathen, Shinya Kanemura

Leading two-loop contributions to the di-photon decay of the Higgs boson are evaluated for the first time in the Inert Doublet Model (IDM). We employ for this calculation the Higgs…