A. Abed Abud
A5048474802- 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
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Parallel Computing and Optimization Techniques
- Medical Imaging Techniques and Applications
- Cardiac Arrest and Resuscitation
- Particle Accelerators and Free-Electron Lasers
- Respiratory Support and Mechanisms
- Nuclear Physics and Applications
- Caching and Content Delivery
- Disaster Response and Management
- Big Data Technologies and Applications
- Plasma Diagnostics and Applications
- Digital Radiography and Breast Imaging
- Sensor Technology and Measurement Systems
European Organization for Nuclear Research
2020-2024
Dune (Italy)
2023
University of Liverpool
2020-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2019-2022
Brookhaven National Laboratory
2021
University of Pavia
2019-2020
Azerbaijan National Academy of Sciences
2019
A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by ATLAS experiment proton-proton collisions at a centre-of-mass energy $\sqrt{s}=$13 during Run 2 Large Hadron Collider correspond an integrated luminosity 139 fb$^{-1}$. functional form fitted dilepton invariant-mass distribution model contribution from background processes, generic signal shape used determine significance observed deviations this estimate. No...
Abstract The algorithms used by the ATLAS Collaboration during Run 2 of Large Hadron Collider to identify jets containing b -hadrons are presented. performance is evaluated in simulation and efficiency with which these measured collision data. measurement uses a likelihood-based method sample highly enriched $$t{\bar{t}}$$ <mml:math...
Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for the ATLAS experiment record signals a wide variety of physics: Standard Model processes searches new phenomena in both proton-proton heavy-ion collisions. To cope with fourfold increase peak LHC luminosity 2015 2018 (Run 2), 2.1$\times$10$^{34}$cm$^{-2}$s$^{-1}$, similar number interactions per beam-crossing about 60, trigger algorithms selections were optimised control rates while retaining...
This article documents the muon reconstruction and identification efficiency obtained by ATLAS experiment for 139 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV collected between 2015 2018 during Run 2 LHC. The increased instantaneous luminosity delivered LHC over this period required a reoptimisation criteria prompt muons. Improved newly developed algorithms were deployed to preserve high with low misidentification rate good momentum resolution. availability large samples...
Jet energy scale and resolution measurements with their associated uncertainties are reported for jets using 36-81 fb$^{-1}$ of proton-proton collision data a centre-of-mass $\sqrt{s}=13$ TeV collected by the ATLAS detector at LHC. Jets reconstructed two different input types: topo-clusters formed from deposits in calorimeter cells, as well an algorithmic combination charged-particle tracks those topo-clusters, referred to particle-flow reconstruction method. The anti-$k_t$ jet algorithm...
The ATLAS detector at the Large Hadron Collider reads out particle collision data from over 100 million electronic channels a rate of approximately $100$ kHz, with recording for physics events 1 kHz. Before being certified analysis computer centres worldwide, must be scrutinised to ensure they are clean any hardware or software related issues that may compromise their integrity. Prompt identification these permits fast action investigate, correct and potentially prevent future such problems...
A search for the dimuon decay of Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity 139 fb$^{-1}$ collected with ATLAS detector in Run2 $pp$ collisions at $\sqrt{s}=13$ TeV Large Hadron Collider. The observed (expected) significance over background-only hypothesis a mass 125.09 GeV $2.0\,\sigma$ ($1.7\,\sigma$). upper limit on cross section times branching ratio $pp \to H \mu\mu$ 2.2 SM prediction 95% confidence level, while expected $H signal...
Abstract The ATLAS experiment at the Large Hadron Collider has a broad physics programme ranging from precision measurements to direct searches for new particles and interactions, requiring ever larger more accurate datasets of simulated Monte Carlo events. Detector simulation with Geant4 is but requires significant CPU resources. Over past decade, developed utilized tools that replace most CPU-intensive component simulation—the calorimeter shower simulation—with faster methods. Here,...
Abstract The need for large-scale production of highly accurate simulated event samples the extensive physics programme ATLAS experiment at Large Hadron Collider motivates development new simulation techniques. Building on recent success deep learning algorithms, variational autoencoders and generative adversarial networks are investigated modelling response central region electromagnetic calorimeter to photons various energies. properties synthesised showers compared with from a full...
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb$^{-1}$ proton-proton collision data at centre-of-mass energy $\sqrt{s} = 13$ TeV recorded with the ATLAS detector LHC. The is performed six analyses searching pairs decaying into bbbb, bbWW, bb$\tau\tau$, WWWW, bb$\gamma \gamma$ and WW$\gamma\gamma$ final states. Results are presented non-resonant resonant modes. No statistically significant excess in above Standard Model predictions found....
The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber with an active volume of $7.2\times 6.0\times 6.9$ m$^3$. It installed at the CERN Neutrino Platform in specially-constructed beam that delivers charged pions, kaons, protons, muons and electrons momenta range 0.3 GeV$/c$ to 7 GeV/$c$. Beam line instrumentation provides accurate momentum measurements particle identification. prototype for first far module Deep Underground Experiment, it incorporates full-size...
The ATLAS experiment at the Large Hadron Collider employs a two-level trigger system to record data an average rate of 1 kHz from physics collisions, starting initial bunch crossing 40 MHz. During LHC Run 2 (2015–2018), operated successfully with excellent performance and flexibility by adapting various run conditions encountered has been vital for Run-2 programme. For proton-proton running, approximately 1500 individual event selections were included in menu which specified signatures...
Abstract Measurements of the Standard Model Higgs boson decaying into a $$b\bar{b}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>b</mml:mi> <mml:mover> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> pair and produced in association with W or Z leptons, using proton–proton collision data collected between 2015 2018 by ATLAS detector, are presented. The measurements use collisions Large Hadron Collider at centre-of-mass energy $$\sqrt{s} = 13\,\text...
A search for new-physics resonances decaying into a lepton and jet performed by the ATLAS experiment is presented. Scalar leptoquarks pair-produced in $pp$ collisions at $\sqrt{s}=13$ TeV Large Hadron Collider are considered using an integrated luminosity of 139 fb$^{-1}$, corresponding to full Run 2 dataset. They searched events with two electrons or muons more jets, including jets identified as arising from fragmentation $c$- $b$-quarks. The observed yield each channel consistent Standard...
A bstract search for the supersymmetric partners of quarks and gluons (squarks gluinos) in final states containing jets missing transverse momentum, but no electrons or muons, is presented. The data used this were recorded by ATLAS experiment proton-proton collisions at a centre-of-mass energy $$ \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 during Run 2 Large Hadron Collider, corresponding to an integrated...
Abstract Higgs boson properties are studied in the four-lepton decay channel (where lepton = e , $$\mu $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>μ</mml:mi> </mml:math> ) using 139 $$\hbox {fb}^{-1}$$ <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> of proton–proton collision data recorded at $$\sqrt{s}=$$ <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> 13 TeV by ATLAS experiment Large...
A bstract search for charged Higgs bosons decaying into a top quark and bottom is presented. The data analysed correspond to 139 fb − 1 of proton-proton collisions at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV, recorded with the ATLAS detector LHC. production heavy boson in association quark, pp → tbH + tbtb , explored H mass range from 200 2000 GeV using final states jets one electron or muon. Events...
A search for chargino$-$neutralino pair production in three-lepton final states with missing transverse momentum is presented. The study based on a dataset of $\sqrt{s} = 13$ TeV $pp$ collisions recorded the ATLAS detector at LHC, corresponding to an integrated luminosity 139 fb$^{-1}$. No significant excess relative Standard Model predictions found data. results are interpreted simplified models supersymmetry, and statistically combined from previous compressed spectra two-lepton states....
Abstract The results of a search for electroweakino pair production $$pp \rightarrow \tilde{\chi }^\pm _1 }^0_2$$ <mml:math...
Abstract A search for direct pair production of scalar partners the top quark (top squarks or third-generation up-type leptoquarks) in all-hadronic $$t{\bar{t}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>t</mml:mi><mml:mover><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math> plus missing transverse momentum final state is presented. The analysis 139 $$\hbox {fb}^{-1}$$...
Abstract This paper describes precision measurements of the transverse momentum $$p_\mathrm {T}^{\ell \ell }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>p</mml:mi><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>ℓ</mml:mi><mml:mi>ℓ</mml:mi></mml:mrow></mml:msubsup></mml:math> ( $$\ell =e,\mu $$...
Abstract A search for heavy resonances decaying into a pair of Z bosons leading to $$\ell ^+\ell ^-\ell '^+\ell '^-$$ <mml:math...
This paper describes a measurement of light-by-light scattering based on Pb+Pb collision data recorded by the ATLAS experiment during Run 2 LHC. The study uses $2.2$ nb$^{-1}$ integrated luminosity collected in 2015 and 2018 at $\sqrt{s_\mathrm{NN}}=5.02$ TeV. Light-by-light candidates are selected events with two photons produced exclusively, each transverse energy $E_{\mathrm{T}}^{\gamma} > 2.5$ GeV, pseudorapidity $|\eta_{\gamma}| < 2.37$, diphoton invariant mass $m_{\gamma\gamma} 5$...
Abstract A technique is presented to measure the efficiency with which c -jets are mistagged as b (mistagging efficiency) using $$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>...
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 $WW,WZ$ $ZZ$...