A search for a heavy resonance pseudo-scalar, A, decaying into a Z boson
and another heavy scalar boson, H, is carried out at the LHC using a data sample
corresponding to an integrated luminosity of 139 fb$^-1$ from proton-proton collisions at $\sqrt{s}$= 13~TeV. In these studies, the scalars $H$ will decay to two scalars $S$ or an $S$
and a Standard Model Higgs boson H via an effective...
In recent years, hints for multi-lepton anomalies have been accumulated by the analysis of Large Hadron Collider (LHC) data, pointing towards the existence of beyond the Standard Model (SM) Higgs bosons. In this study, we further investigate these multi-lepton anomalies by considering the Higgs Triplet Model with a hyper-charge of zero (HTM0). It consists of a neutral scalar $H^{0}$ that stems...
Effects that were expected to occur only in the hot and dense medium formed in heavy-ion collisions, such as collective fluid-like behaviour and strangeness enhan- cement, were observed in high multiplicity proton–proton (pp) and proton–nucleus (pA) collisions. The strength of these effects increases steadily with the final sta- te multiplicity going from pp to p–Pb up to peripheral Pb–Pb...
TiO-0016 is part of the Tile-in-One Platform (TiO), a collection of independent web applications called plugins. It is designed to provide temperature and voltage data assessment from the Front End (FE) Electronics of the Tile Calorimeter. Since instrumentation and its interfaces are a very important aspect of any experiment, automatic control procedures, efficient error recognition and...
Motivated by the recent emergence of multi-lepton anomalies as deviations from Standard Model (SM) predictions in several ATLAS and CMS analyses of Large Hadron Collider data, it is anticipated that the production of Higgs-like scalar $H$ and excesses in the multi-lepton final states at the Large Hadron Collider will have a significant rate. A 2HDM$+S$ model, where $S$ is a singlet scalar in...
Now that we find ourselves in the epoch of gravitational-wave (GW) astronomy, we can explore new avenues by which to test general relativity (GR) and search for extra dimensions. As a first step, we consider the quasinormal mode (QNM) spectrum of a 4D Schwarzschild black hole embedded in a 7D partially-compactified space-time of mixed scalar curvature. This allows us also to explore the...
FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such particles may be produced in the very forward direction of the LHC's high-energy collisions and then decay to visible particles inside the FASER detector, which is placed 480 m downstream of the ATLAS interaction point,...
In searches to discover new physics, at the LHC, machine learning classifiers can be used to
extract signal events from background processes. Semi-supervised machine learning classifiers
can be used to extract unlabeled signals from labeled background events, reducing biases
caused by preconceived understanding of the signal. When training machine learning
classifiers, overfitting can...
Open heavy-flavour hadrons are one of the the key diagnostic tools available to study the dense, hot strongly interacting matter formed in relativistic collisions. The charm and beauty quarks are produced at the early stages of the collision via hard scattering due to their large bare masses, which exceed the QCD scale parameter ($\lambda_{\rm QCD}$) significantly. Consequently in pp...
The fixed-target NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) seeks to find the critical point (CR) of strongly interacting matter and the properties of the onset of deconfinement. The experiment provides a scan of measurements of particle spectra and fluctuations in proton-proton, proton-nucleus, and nucleus-nucleus interactions as functions of collision energy and system...
The Timing, Trigger and Control (TTC) system of the ATLAS Tile Calorimeter has be replaced for the Run 3 data-taking period. A new TTC interface module, the ATLAS Local Trigger Interface (ALTI) has been integrated and commissioned as part of the Phase-I upgrades. The ALTI module participated in the first Run 3 stable beam collisions (July 2022), recording events at $\sqrt{s}$ = 13.6 TeV. The...
Vector meson photoproduction is studied at the LHC with the ALICE detector in pA and AA ultra-peripheral collisions (UPCs), where the ions act as powerful sources of quasi-real photons. Measurements of vector meson photoproduction off hadrons shed light on the initial state of QCD matter inside the targets and provides important constraints to the initial conditions used in models of heavy ion...
The high energy and diverse running operations at the LHC allow the ATLAS detector to probe the Standard Model in extreme phase spaces and environments. This talk will highlight recent results for the ATLAS experiment. In particular, we will focus on probes of QCD from high energy jet production to measurements of the strong coupling. Additionally, this talk will also highlight recent...
Many theories beyond the Standard Model (BSM) have been proposed to address several of the Standard Model shortcomings, such as the origin of dark matter and neutrino masses, the fine-tuning of the Higgs Boson mass, or the observed pattern of masses and mixing angles in the quark and lepton sectors. Many of these BSM extensions predict new particles or interactions directly accessible at the...
Many theories beyond the Standard Model predict new phenomena, such as Zprime, Wprime bosons, scalars, KK gravitons, heavy leptons, supersymmetry, in final states with high-pT objects such as leptons, photons and jets. Searches for new physics with such signatures are performed using the ATLAS experiment at the LHC. The most recent 13 TeV pp results with the full LHC Run 2 dataset will be reported.
Data generation and event classification are crucial and resource-intensive processes in high energy physics searches at the LHC. Deep learning methodologies are being increasingly adopted as alternative methodologies to traditional data generation and event classification mechanisms to increase efficiency, accuracy and resource demand. In this work, a Variational Auto-encoder (VAE) and...
The limitations of the standard model (SM) have led the community of particle physics to search for different physics models beyond the SM (BSM). With the discovery of the Higgs boson at the LHC completing the SM of particle physics and its measured properties are compatible with the one predicted by the SM, this does not exclude the possible existence of additional scalar bosons provided...
