Conveners
Parallel Session Thursday: Phenomenology III
- Bibhushan Shakya (T (Cosmology))
Parallel Session Thursday: Phenomenology IV
- Emmanuel Stamou (TU Dortmund)
The trilinear Higgs coupling $\lambda_{hhh}$ is a crucial tool to access the structure of the Higgs potential and probe possible effects of physics beyond the Standard Model (SM). Focusing on the Two-Higgs-Doublet Model as a concrete example, I will discuss the calculation of the leading two-loop corrections to $\lambda_{hhh}$, and show that this coupling can be significantly enhanced with...
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 talk, I will explain how existing inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments can be used to constrain the CP nature of the top-Yukawa...
We address the notorious metastability of the standard model (SM) and promote it to a model building task: What are the new ingredients required to stabilize the SM up to the Planck scale without encountering subplanckian Landau poles?
We tackle this issue in a less common manner, as the SM is minimally extended by vector-like fermions, while no new scalar fields are introduced.
We chart...
In the CP-violating 2HDM, the CP-violating Higgs to fermions couplings can make an additional loop contribution on the Higgs to gauge bosons couplings. In order to address this aspect, we consider a generic model which has the effective CP-violation structure of the Higgs to gauge bosons couplings. We explore the effect of CP-violation term via the process $𝑒^+𝑒^−→𝐻𝑍,𝑍→𝜇^+𝜇^−$, where the...
Using a CMS measurement of four top (𝑡𝑡¯𝑡𝑡¯) production in proton-proton collisions we constrain the parameter space of BSM scalar models. We study these effects for models with a generic scalar X with couplings to W-bosons and to top-quarks. We use Monte-Carlo simulators and fast detector simulations to recast the CMS analysis in order to obtain upper limits on the cross section times...
In traditional models, no matter in SUSY or CHM, top partners are introduced to cancel the top loop contribution to the Higgs quadratic term. However, the lack of evidence for these top partners required increasing fine-tuning in these types of models. To get a natural EWSB model, an alternative is preferred. In this talk, I will present solutions in another direction. Instead of canceling the...
We investigate b→s flavor-anomaly solutions with $U(1)^\prime$ extensions in the framework of asymptotically safe quantum gravity. We study three different $U(1)^\prime$ extensions with vector-like fermions and a scalar field whose vev breaks the new $U(1)^\prime$. The universal contribution of quantum gravity to renormalization group equations (RGEs) of all the gauge and the Yukawa...
A local flavor symmetry acting on the quarks of the Standard Model can automatically give rise to an accidental global $U(1)$ symmetry which remains preserved from sources of explicit breaking up to a large operator dimension, while it gets spontaneously broken together with the flavor symmetry. Such non-fundamental symmetries are often endowed with a mixed QCD anomaly, so that the...
Effective Field Theories provide a framework to parametrise the effects of yet unseen heavy degrees of freedom in a model independent way. While in recent years the interest in higher-dimensional operators has increased, the construction of a complete and minimal set of operators is remarkably challenging. In this talk, I will report on $\texttt{AutoEFT}$, our implementation of a recently...
We analyze the signature missing energy + jet in the process $pp \rightarrow \nu \bar \nu + \text{jet}$ to derive constraints within the Standard Model Effective Field Theory (SMEFT).
The main focus is on semileptonic four fermion operators, which also have been constrained using conventional high-$p_T$ Drell-Yan data, low energy observables and are connected to the B-Anomalies.
We find that...
Global SMEFT analyses have become a key interpretation framework for LHC physics, quantifying how well a large set of kinematic measurements agrees with the Standard Model. This agreement is encoded in measured Wilson coefficients and their uncertain- ties. A technical challenge of global analyses are correlations. We compare, for the first time, results from a profile likelihood and a...
Gravitational waves offer a new way to understand the Higgs via the Electroweak phase transition. The signal from such a transition would, if observed, give crucial information of the underlying physics. Provided that the transition is first-order and proceeds through nucleating bubbles. Yet theoretical predictions of the gravitational-wave spectrum are rife with uncertainties. Large ones at...
Hidden particles can help explain many important hints for new physics, but the large variety of viable hidden sector models poses a challenge for the model-independent interpretation of hidden particle searches. We present techniques published in 2105.06477 and 2203.02229 that can be used to compute model-independent rates for hidden sector induced transitions. Adapting an effective field...
In explaining the EWSB, it was postulated that Higgs boson might be a composite state of pNBGs from the breaking of a larger global group. The AdS/CFT correspondence provides a dual theory which is weakly coupled to perform the perturbative calculations, for example the particles spectrum. In applications to QCD-like theories, the AdS/QCD models are developed. In this talk I will introduce a...
We systematically study model-independent constraints on the three generic charged Higgs couplings to $b$-quarks and up-type quarks. While existing LHC searches have focussed on the $tb$ coupling, we emphasize that the LHC plays a crucial role in probing also $ub$ and $cb$ couplings, since constraints from flavor physics are weak. In particular we propose various new searches that can...
Several anomalies are currently hinting at the presence of new physics effects in the lepton sector of the Standard Model. First of all, neutrino oscillation experiments have clearly established that neutrinos are massive, while on the cosmological side, the existence of dark matter (DM) is robustly settled. Interestingly, other anomalies have recently shown up, mainly involving the muon: the...
In this talk, I will consider light dark sectors (DS) interacting with the Standard Model (SM) through irrelevant portals that are motivated on general principles. I will talk about how we can derive bounds on such scenarios using the decay of dark sector excitations inside neutrino detectors based on proton beams. Our approach is model-independent and applies to a wide range of dark sector...
I will present a sensitivity test of the muon-Yukawa sector at a high-energy muon collider. While in the Standard Model this sector is described by a single parameter, effects of new physics that is not aligned with the Standard Model Yukawa interactions may introduce a more sophisticated parameter dependence, which can be understood either in SMEFT or a HEFT frameworks.
With the...
