The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, and the broad interest in flavor physics in the tera-Z phase of the proposed FCC-ee program, I discuss constraints on new physics contributions to Bd and Bs mixings which can be obtained in these benchmark scenarios.

We discuss the minimalistic scenarios of new physics at the $\mathcal{O}(\mathrm{TeV})$ scale which involve one leptoquark state (LQ) and which are consistent with a number of measured low energy flavor physics observables, as well as with the results of the direct searches at the LHC. In particular we examine the scenarios which can accommodate the so-called B-physics anomalies i.e....

Measurements of top quark spin observables in tt ̄ events represents a unique possibility to test the standard model (SM) predictions and probe the new physics effects. Potential deviations from the SM expectations are parametrized within the framework of the Effective Field Theory (EFT). In this presentation, we introduce how to measure the spin correlation between top quarks and we cover...

The large increase of pile-up interactions is one of the main experimental challenge for HL-LHC physics program. Covering the pseudo-rapidity region between 2.4 and 4.0, the Hight Granularity Timing Detector (HGTD) is therefore proposed for the ATLAS Phase-II upgrade. Using the ability to distinguish between interactions within an event at different 𝑧 positions or time by high-precision...

The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose underground Liquid Scintillator detector with a target mass of 20 kt, a baseline of 53 km, and an energy resolution of 3% at 1 MeV. The main goal of JUNO is to determine the neutrino mass hierarchy to 3σ over six years of operation and provide accurate measurements of the neutrino oscillation parameters. JUNO will cover a...

The development of the merged EPOS+PHSD approach is one way to study the

influence of the initial non-equilibrium stage of the heavy-ion reactions on the

final observables. The microscopic understanding of the initial phase of heavy-ion

collisions is an intricate problem, in this respect, the EPOS and PHSD approaches

provide a unique possibility to address this problem. We employ the EPOS...

It is now known that a deconfined states of the strongly interacting matter can be formed under extreme conditions of temperature and density in heavy-ion collisions : the quark-gluon plasma (QGP). Intensive works has been done to understand its fascinating properties but many questions remain unanswered. Especially, theoretical studies suggest the existence of a critical point in the phase...

Within the framework of the exploration of the phase diagram of nuclear matter, the susceptibilities are useful tools to probe the existence of a 1st order phase transition and a possible critical endpoint. In this context, STAR collaboration recently published some results of variances and 2nd order susceptibility ratios for electric charge (Q), protons and kaons (the last 2 being used as...

We study the diffractive dissociation of a small onium and of a virtual photon in the scattering off a large nucleus. In a well-defined parametric regime, the nuclear scattering of the onium is triggered by large-dipole fluctuations in the course of its rapidity evolution in the form of color dipole branching, and the diffractive dissociation with a minimal gap $Y_0$ out of total rapidity $Y$...

QCD at finite temperatures and densities is plagued by infrared divergences that need to be resummed. The recently

developped renormalization group optimized perturbation theory (RGOPT) gives a RG-compatible resummation, that

substantially reduces the large residual renormalization scale dependence observed in more standard resummations

known as hard thermal loop (HTL) or hard dense loop...

During the last decade the Curci-Ferrari model has been widely used to study, in a perturbative approach, the infrared behaviour of both YM theory and QCD. One-loop results for two- and three-point correlation functions have shown in general a very good agreement with lattice data. In this talk I will present the natural step forward of this analysis: the extension to two-loop order. I will...

Following theoretical (high-energy physics) considerations, we explore the possibility that our Universe contains a *negative cosmological constant*, dubbed $\lambda$, on top of an additional component $X$ accounting for the late-time accelerated stage of expansion. In this talk, I will present some of the cosmological implications of introducing $\lambda$. In particular, we will assess the...

The 'S8 tension' is a longstanding discrepancy between the cosmological and local determination of the amplitude of matter fluctuations, parameterized as S8≡σ8(Ωm/0.3)^0.5, where σ8 is the root mean square of matter fluctuations on a 8 Mpc/h scale, and Ωm is the total matter abundance. In this talk, I discuss that it is possible to resolve the tension if dark matter (DM) decays with a lifetime...

Several extensions of the Weak Gravity Conjecture have been proposed in the literature. I plan to report on the proposal for the case of scalar self-interactions and sketch out some implications. This is based on work with K. Benakli and G. Lafforgue-Marmet.

In the perspective of UV completion of Composite Higgs, the Techni-Pati-Salam model offers a unique approach. We extend a Composite Higgs scenario all the way to the Planck scale with the ambition of obtaining at low energy enough ingredients for flavour hierarchy and a dark matter candidate.

The problematic huge hierarchy between the usual 4-dimensional Planck mass scale of gravity and the ElectroWeak symmetry breaking scale can interestingly disappear at some point-like location along extra space-like dimensions where the effective gravity scale is reduced down to the TeV scale. Field theories with point-like particle locations (3-dimensional brane-worlds) or point-like...