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This thesis presents a search for long-lived axion-like particles (ALPs) produced in association with a topantitopquark pair and decaying to a displaced dimuon, using proton-proton collision data recorded by theCompact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC), at √s = 13 TeV and√s = 13.6 TeV, corresponding to integrated luminosities of 138 and 62 fb−1, respectively. A top-philicALP scenario is considered, in which the ALP couples predominantly to top quarks and the effectivecouplings governing its decay are loop-suppressed, allowing the ALP to be long-lived. [...]

Searches for the production of $τ$-sleptons ($\tildeτ$), charginos ($\tildeχ^{\pm}_1$), and neutralinos ($\tildeχ^0_2$) in events with at least one hadronically decaying $τ$-lepton are presented, targeting compressed mass spectra scenarios. For charginos and neutralinos, the cascade decays producing either a $τ$-slepton or a $τ$-sneutrino are considered. [...]

This Letter presents a combination of searches for Higgs boson pair (HH) production performed by the ATLAS and CMS Collaborations using proton-proton collision datasets recorded at s=13 TeV during the Large Hadron Collider Run 2, corresponding to integrated luminosities ranging between 126 and 140 fb-1. The upper limit at the 95% confidence level on the total HH signal strength, defined as the ratio of the measured cross section to the standard model (SM) prediction, corresponds to 2.5, with an expected value of 1.7 (2.8) assuming the absence (presence) of the SM HH signal. [...]

A search for quantum black holes in electron+jet or muon+jet final states with high invariant mass is performed. The analysis uses data from s=13.6TeVpp collisions recorded by the ATLAS detector between 2022 and 2024 during Run 3 of the Large Hadron Collider, corresponding to an integrated luminosity of 164fb−1. [...]

This article details two studies of Higgs boson properties using the vector-boson fusion production mode and the γγjj final state. Both efforts are based on a data sample corresponding to 164 fb$^{−1}$ of $ \sqrt{s}=13.6 $ TeV proton-proton collisions recorded by the ATLAS experiment at the Large Hadron Collider [...]

The Lorentz-contracted electromagnetic fields of the ions in ultra-relativistic heavy-ion collisions generate intense quasi-real photon fluxes. These lead to photon-induced interactions that are observed in ultra-peripheral collisions (UPCs), such as vector meson and lepton-pair production. [...]

This paper presents a measurement of photon plus two-jet events in pp and Pb+Pb collisions, i.e. events in which the transverse momentum of a single photon is balanced by two distinct jets. [...]

Understanding the crystallization pathways of water-rich ammonia-water (N⁢H3−H2⁡O) solutions and the stability of ammonia hydrates is key to unraveling the behavior of complex hydrogen-bonding networks and to modeling planetary interiors. Yet there are still inconsistencies in the crystallization sequence reported upon pressure-induced crystallization of H2⁡O-rich N⁢H3−H2⁡O solutions at room temperature. [...]

The first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state ZZjj→ℓℓννjj, where ℓ=e, μ, is reported by the CMS experiment. The analysis is based on a data sample of proton-proton (pp) collisions at s=13 TeV, corresponding to an integrated luminosity of 138 fb-1. [...]

This paper presents a search for beyond the standard model physics using single-lepton events with a high multiplicity of jets, including those identified as bottom quark jets, without a requirement on missing transverse momentum. The analysis is based on proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{−1}$ [...]