Conveners
Parallel - WG1-GLOB
- Patrick Koppenburg (Nikhef)
- Jenny List (DESY)
- Fabio Maltoni Maltoni (UCL)
- JORGE DE BLAS (University of Granada)
Parallel - WG1-GLOB: ====> HTE+GLOB
- Alexander Grohsjean (CEA Saclay Irfu/SPP)
- Chris Hays (Oxford University)
- Sven Heinemeyer (IFCA (CSIC-UC, Santander))
- Karsten Köneke (University of Freiburg)
- Junping Tian (University of Tokyo)
- Fabio Maltoni Maltoni (UCL)
- Marcel vos (IFIC - centro mixto U. Valencia/CSIC, Valencia, Spain)
- JORGE DE BLAS (University of Granada)
- Patrick Koppenburg (Nikhef)
- Jenny List (DESY)
Differential measurements of WW production have a long history in the (linear) $e^{+}e^{-}$-collider community. In particular, to determine the (anomalous) triple gauge couplings (aTGC) and the longitudinal beam polarization. However, if done in full simulation at all, these studies focused on higher center-of-mass energies of 500-1000 GeV. So far only extrapolations of these results to the...
In this contribution by the IFIT/C group we present a global SMEFT analysis of the top sector. We indclude measurements by ATLAS and CMS using the LHC run 2 data, as well as projections for the HL-LHC and the future electron-positron collider projects. We update the fits for the Snowmass study (arXiv:2206.08326) with new LHC results, new projections for ttll four-fermion operators and a new...
The electron-positron phase of the Future Circular Collider (FCC-ee) at CERN is proposed as a Higgs, electroweak, flavour, and top factory at the intensity frontier. In particular, about 2 million top quark pairs are expected to be produced at the 365 GeV operation, providing a clean dataset with unprecedented opportunities for top property measurements. This talk covers recent studies on two...
We present SMEFiT3.0, an updated global SMEFT analysis of Higgs, top quark, and diboson data from the LHC complemented by electroweak precision observables (EWPOs) from LEP and SLD. We estimate the impact on the SMEFT parameter space of HL-LHC measurements when added on top of SMEFiT3.0 by means of dedicated projections that extrapolate Run II data. Subsequently, we quantify the unprecedented...
We study the leading loop-level phenomenology of composite Higgs models via the effective field theory of a strongly interacting light Higgs and top quark (SILH+TQ). We systematically analyze the renormalization group evolution (RGE) of tree-generated operators in the SILH+TQ scenario, finding large mixings of flavor non-universal operators into those affecting electroweak precision...
The angular distributions in the $e^+e^- \to ZH \to f\bar{f}H$ process provide a new probe to the BSM physics on top of the signal strength, in particular useful when BSM physics induces anomalous couplings with new Lorentz structure. Those anomalous couplings result in changes in event shape that are highly dependent on the collision energies. In this study we perform full detector simulation...
We systematically study potential effects of BSM physics in the $e^+ e^- \to Z H$ process. To this end, we include all relevant dimension-6 Standard Model Effective Field Theory operators and work to next-to-leading order (NLO) accuracy in the electro-weak coupling. We consider both polarized and unpolarized electron and positron beams and present results for $\sqrt{s}=240$, $365$ and ...
As a milestone in the physics program of future lepton colliders, the process of double Higgs-strahlung ee → ZHH allows direct access to the Higgs self-coupling at energies above ≈ 450 GeV. The last full evaluation of measuring this process at a conter-of-mass energy of 500 GeV is more than 10 years old, and many of the reconstruction tools have received major improvements since, including...
The trilinear Higgs coupling (THC) offers a unique opportunity to probe the structure of the Higgs sector and to study the nature of the electroweak phase transition. It provides experimental access to the Higgs potential, the “holy grail” of Particle Physics, and should be a crucial target for future high-energy colliders. Extended Higgs sectors, featuring additional Higgs bosons, can give...
In this talk I will discuss some highlights emphasising the physics case for running an e^+e^- collider at 500 GeV and above. In this context I will focus in particular on the experimental access to the Higgs potential via di-Higgs and (at sufficiently high energy) triple Higgs production. The information obtainable from Higgs pair production at about 500 GeV will be compared with the indirect...