A. C. Abusleme Hoffman
A5056881719- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Advanced Memory and Neural Computing
- Analog and Mixed-Signal Circuit Design
- Ferroelectric and Negative Capacitance Devices
- CCD and CMOS Imaging Sensors
- Semiconductor materials and devices
- Particle Accelerators and Free-Electron Lasers
- Neuroscience and Neural Engineering
- Low-power high-performance VLSI design
- Superconducting Materials and Applications
- Medical Imaging Techniques and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Advancements in PLL and VCO Technologies
- Radiation Effects in Electronics
- Atomic and Subatomic Physics Research
- Respiratory Support and Mechanisms
Pontificia Universidad Católica de Chile
2015-2024
Millennium Science Initiative
2022-2024
University of Alabama at Birmingham
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2022-2023
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine
2023
New York University
2023
University of Udine
2022
Universidad Andrés Bello
2022
University of Trieste
2022
Federico Santa María Technical University
2017-2020
Abstract The standard model of particle physics 1–4 describes the known fundamental particles and forces that make up our Universe, with exception gravity. One central features is a field permeates all space interacts 5–9 . quantum excitation this field, as Higgs manifests itself boson, only no spin. In 2012, properties consistent boson was observed by ATLAS CMS experiments at Large Hadron Collider CERN 10,11 Since then, more than 30 times many bosons have been recorded experiment, enabling...
The Compact Linear Collider (CLIC) is a multi-TeV high-luminosity linear e+e- collider under development. For an optimal exploitation of its physics potential, CLIC foreseen to be built and operated in staged approach with three centre-of-mass energy stages ranging from few hundred GeV up 3 TeV. first stage will focus on precision Standard Model physics, particular Higgs top-quark measurements. Subsequent measurements rare processes, as well searches for new processes states, e.g. states...
Abstract The ATLAS experiment at the Large Hadron Collider has a broad physics programme ranging from precision measurements to direct searches for new particles and interactions, requiring ever larger more accurate datasets of simulated Monte Carlo events. Detector simulation with Geant4 is but requires significant CPU resources. Over past decade, developed utilized tools that replace most CPU-intensive component simulation—the calorimeter shower simulation—with faster methods. Here,...
The flavour-tagging algorithms developed by the ATLAS Collaboration and used to analyse its dataset of $\sqrt s = 13$ TeV $pp$ collisions from Run 2 Large Hadron Collider are presented. These new tagging based on recurrent deep neural networks, their performance is evaluated in simulated collision events. developments yield considerable improvements over previous jet-flavour identification strategies. At 77% $b$-jet efficiency operating point, light-jet (charm-jet) rejection factors 170 (5)...
Many extensions of the Standard Model predict production dark matter particles at LHC. Sufficiently light may be produced in decays Higgs boson that would appear invisible to detector. This Letter presents a statistical combination searches for H $\rightarrow$ where multiple modes are considered. These performed with ATLAS detector using 139 fb$^{-1}$ proton-proton collisions centre-of-mass energy $\sqrt{s} =13$ TeV In results =7$ and 8 TeV, an upper limit on branching ratio 0.107 (0.077)...
Abstract The need for large-scale production of highly accurate simulated event samples the extensive physics programme ATLAS experiment at Large Hadron Collider motivates development new simulation techniques. Building on recent success deep learning algorithms, variational autoencoders and generative adversarial networks are investigated modelling response central region electromagnetic calorimeter to photons various energies. properties synthesised showers compared with from a full...
Abstract The ATLAS detector is installed in its experimental cavern at Point 1 of the CERN Large Hadron Collider. During Run 2 LHC, a luminosity ℒ = × 10 34 cm -2 s -1 was routinely achieved start fills, twice design luminosity. For 3, accelerator improvements, notably levelling, allow sustained running an instantaneous , with average up to 60 interactions per bunch crossing. has been upgraded recover single-lepton trigger thresholds while operating comfortably under 3 pileup conditions. A...
The Compact Linear Collider (CLIC) is an option for a future $${\mathrm{e}^{+}}{\mathrm{e}^{-}} $$ collider operating at centre-of-mass energies up to $$3\,\text {TeV} , providing sensitivity wide range of new physics phenomena and precision measurements the energy frontier. This paper first comprehensive presentation Higgs reach CLIC three stages: $$\sqrt{s} = 350\,\text {GeV} 1.4 . initial stage operation allows study boson production in Higgsstrahlung ( \rightarrow {\mathrm{Z}}...
The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of project, its current status, and future developments. It presents physics potential reports on design, technology, implementation aspects accelerator detector. foreseen to be built operated stages, centre-of-mass energies 380 GeV, 1.5 TeV 3 TeV, respectively. uses two-beam acceleration...
Ferroelectric Zr-doped HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (HZO) is a promising candidate for steep slope transistors and memory technology. For these applications, it essential to understand optimize the switching dynamics of ferroelectric film. In this letter, we characterize polarization reversal an 8 nm-thick HZO film deposited by atomic layer deposition with voltage pulses varying in amplitude (0.8-2 V) duration (200...
A search for chargino$-$neutralino pair production in three-lepton final states with missing transverse momentum is presented. The study based on a dataset of $\sqrt{s} = 13$ TeV $pp$ collisions recorded the ATLAS detector at LHC, corresponding to an integrated luminosity 139 fb$^{-1}$. No significant excess relative Standard Model predictions found data. results are interpreted simplified models supersymmetry, and statistically combined from previous compressed spectra two-lepton states....
A bstract We present the calibration strategy for 20 kton liquid scintillator central detector of Jiangmen Underground Neutrino Observatory (JUNO). By utilizing a comprehensive multiple-source and multiple-positional program, in combination with novel dual calorimetry technique exploiting two independent photosensors readout systems, we demonstrate that JUNO can achieve better than 1% energy linearity 3% effective resolution, required by neutrino mass ordering determination.
A search for charginos and neutralinos at the Large Hadron Collider using fully hadronic final states missing transverse momentum is reported. Pair-produced or are explored, each decaying into a high-pT Standard Model weak boson. Fully studied to exploit advantage of large branching ratio, efficient rejection backgrounds by identifying bosons large-radius jets jet substructure information. An integrated luminosity 139 fb−1 proton-proton collision data collected ATLAS detector center-of-mass...
A bstract direct search for Higgs bosons produced via vector-boson fusion and subsequently decaying into invisible particles is reported. The analysis uses 139 fb − 1 of pp collision data at a centre-of-mass energy $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV recorded by the ATLAS detector LHC. observed numbers events are found to be in agreement with background expectation from Standard Model...
Abstract A technique is presented to measure the efficiency with which c -jets are mistagged as b (mistagging efficiency) using $$t\bar{t}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> events, where one of W bosons decays into an electron or muon and a neutrino other quark–antiquark pair. The measurement utilises relatively large known $$W\rightarrow cs$$ <mml:mi>W</mml:mi>...
JUNO is a multi-purpose neutrino observatory under construction in the south of China. This publication presents new sensitivity estimates for measurement $\Delta m^2_{31}$, m^2_{21}$, $\sin^2 \theta_{12}$, and \theta_{13}$ oscillation parameters using reactor antineutrinos, which one primary physics goals experiment. The sensitivities are obtained best knowledge available to date on location overburden experimental site, nuclear reactors surrounding area beyond, detector response...
A search for the Higgs boson decaying into a pair of charm quarks is presented. The analysis uses proton-proton collisions to target production in association with leptonically $W$ or $Z$ boson. dataset delivered by LHC at centre-of-mass energy $\sqrt{s}=13$ TeV and recorded ATLAS detector corresponds an integrated luminosity 139 fb$^{-1}$. Flavour-tagging algorithms are used identify jets originating from hadronisation quarks. method validated simultaneous measurement $WW,WZ$ $ZZ$...
Searches are performed for nonresonant and resonant di-Higgs boson production in the b¯bγγ final state. The dataset used corresponds to an integrated luminosity of 139 fb−1 proton–proton collisions at a center-of-mass energy 13 TeV recorded by ATLAS detector CERN Large Hadron Collider. No excess above expected background is found upper limits on cross sections set. A 95% confidence-level limit 4.2 times section predicted Standard Model set pp→HH production, where 5.7 value. constraints...
This paper presents the observation of four-top-quark ($t\bar{t}t\bar{t}$) production in proton-proton collisions at LHC. The analysis is performed using an integrated luminosity 140 fb$^{-1}$ a centre-of-mass energy 13 TeV collected ATLAS detector. Events containing two leptons with same electric charge or least three (electrons muons) are selected. Event kinematics used to separate signal from background through multivariate discriminant, and dedicated control regions constrain dominant...
Constraints on the Higgs boson self-coupling are set by combining double-Higgs analyses in bb¯bb¯, bb¯τ+τ− and bb¯γγ decay channels with single-Higgs targeting γγ, ZZ⁎, WW⁎, τ+τ− bb¯ channels. The data used these were recorded ATLAS detector at LHC proton–proton collisions s=13 TeV correspond to an integrated luminosity of 126–139 fb−1. combination sets upper limit μHH<2.4 95% confidence level production cross-section normalised its Standard Model prediction. Combining analyses, assumption...
A search for the electroweak production of pairs charged sleptons or charginos decaying into two-lepton final states with missing transverse momentum is presented. Two simplified models $R$-parity-conserving supersymmetry are considered: direct pair-production ($\tilde{\ell}\tilde{\ell}$), each a lepton and $\tilde{\chi}_1^0$ neutralino, lightest $(\tilde{\chi}_1^\pm\tilde{\chi}_1^\mp)$, $W$-boson $\tilde{\chi}_1^0$. The neutralino ($\tilde{\chi}_1^0$) assumed to be supersymmetric particle...
Abstract Searches for new phenomena inspired by supersymmetry in final states containing an $$e^+e^-$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>-</mml:mo> </mml:mrow> </mml:math> or $$\mu ^+\mu ^-$$ <mml:mi>μ</mml:mi> pair, jets, and missing transverse momentum are presented. These searches make use of proton–proton collision data with integrated luminosity $$139~\text {fb}^{-1}$$...
The identification of $b$-jets, referred to as $b$-tagging, is an important part many physics analyses in the ATLAS experiment at Large Hadron Collider and accurate calibration its performance essential for high-quality results. This publication describes light-flavour jet mistagging efficiency a data sample proton-proton collision events $\sqrt{s}=13$ TeV corresponding integrated luminosity 139 fb$^{-1}$. performed $Z$ bosons produced association with jets. Due low jets, method which uses...
A search for nonresonant Higgs boson pair production in the $b\overline{b}b\overline{b}$ final state is presented. The analysis uses $126\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collision data at $\sqrt{s}=13\text{ }\mathrm{TeV}$ collected with ATLAS detector Large Hadron Collider, and targets both gluon-gluon fusion vector-boson modes. No evidence signal found observed (expected) upper limit on cross section determined to be 5.4 (8.1) times Standard Model predicted 95%...