Conveners
T07-T09: Combined: Top, Electroweak and Higgs Physics: Part 1
- Michael Trott (NBI)
- Eleni Vryonidou
T07-T09: Combined: Top, Electroweak and Higgs Physics: Part 2
- Michael Trott (NBI)
- Alexander Grohsjean (CMS (CMS Fachgruppe TOP))
The measurement of Higgs boson production in association with one or two top quarks is essential to understand the top-quark couplings to the Higgs boson. This talk presents the analyses using Higgs boson into several final states, using pp collision data collected at 13 TeV.
The question whether the Higgs boson is connected to additional CP violation is one of the driving forces behind precision studies at the Large Hadron Collider. In this work, we investigate the CP structure of the top quark Yukawa interaction---one of the most prominent places for searching for New Physics---through Higgs boson loops in top quark pair production. We calculate the electroweak...
The CP structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the CP-nature of the top-Yukawa interaction. The model...
Thanks to its high luminosity and center of mass energy, the future FCC-hh collider will allow us to probe processes with clean but rare final states that are unaccessible at the LHC. The study of diboson production processes poses a promising way of indirectly constraining New Physics in the context of the Higgs Boson. Specifically, the diphoton leptonic decay channels of the Wh and Zh...
The high-energy tails of charged- and neutral-current Drell-Yan (DY) processes provide important constraints on the light quark and anti-quark parton distribution functions (PDFs) in the large-x region. On the other hand, a hypothetical short-distance new physics would smoothly distort the high-energy tails as described by the Standard Model Effective Field Theory (SMEFT). In this work, we...
The existence of a mass gap between the Standard Model (SM) and possible new states encourages us to use effective field theories. Here we consider the non-linear realization of the electroweak symmetry breaking: the electroweak effective theory (EWET), also known as Higgs effective field theory (HEFT) or electroweak chiral Lagrangian (EWChL). At short distances a resonance Lagrangian which...
We calculate fermion-loop corrections to high energy $W^+W^-$ scattering in the context of a Strongly Interacting Electroweak Symmetry Breaking Sector (EWSBS) using Higgs Effective Field Theory(HEFT). We test the assumption that these corrections are negligible when compared to the boson-loop ones, as it is commonly taken for granted in the literature. While this is correct in most cases, we...
"In this talk I’ll talk about truncation errors in the Stadard Model Efftective Field Theory (SMEFT) paradigm — meaning errors from higher terms in the EFT expansion. The main tool I’ll use to tackle this type of uncertainty is special operator basis called the “Geometric SMEFT”, or geoSMEFT. I will explain the benefits of the geoSMEFT basis and go through some preliminary studies of the...
In my talk I will present a model-independent analysis of the magnetic and electric dipole moments of the muon and electron. The expressions for the dipole moments are given in terms of operator coefficients of the low-energy effective field theory (LEFT) and the Standard Model effective field theory (SMEFT). One-loop renormalization group improved perturbation theory, including the one-loop...
We present two works which study global properties of EFT descriptions of physics beyond the Standard Model (BSM).
The first, based on arXiv:2008.08597, considers what BSM physics is amenable to a decoupling SMEFT description. The four scalar degrees of freedom of the Standard Model, the Higgs and the longitudinal components of the Ws and Z, can be viewed one of two ways: "SMEFT" wraps them...
We present an extensive global interpretation of Higgs, diboson, and top quark production and decay measurements from the LHC in the framework of the Standard Model Effective Field Theory (SMEFT) at dimension six. We constrain simultaneously 36 independent directions in its parameter space, and compare the outcome of the global analysis with that from individual and two-parameter fits. Our...
