M. G. Alviggi
A5015333172- 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
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Medical Imaging Techniques and Applications
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Advanced Data Storage Technologies
- Radiation Effects in Electronics
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- advanced mathematical theories
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Big Data Technologies and Applications
- Railway Engineering and Dynamics
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2016-2025
University of Naples Federico II
2016-2025
A. Alikhanyan National Laboratory
2024
Atlas Scientific (United States)
2024
University of Geneva
2024
The University of Adelaide
2014-2023
Johannes Gutenberg University Mainz
2023
I.R.C.C.S. Oasi Maria SS
2022
Federico II University Hospital
2020-2021
Instituto de Física Corpuscular
2019-2020
A search for the Standard Model Higgs boson in proton-proton collisions with ATLAS detector at LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb^-1 collected sqrt(s) = 7 TeV 2011 and 5.8 8 2012. Individual searches channels H->ZZ^(*)->llll, H->gamma gamma H->WW->e nu mu data are combined previously published results H->ZZ^(*), WW^(*), bbbar tau^+tau^- from improved analyses H->ZZ^(*)->llll data. Clear evidence production a neutral measured mass...
During 2015 the ATLAS experiment recorded $$3.8\,{\mathrm{fb}}^{-1}$$ of proton–proton collision data at a centre-of-mass energy $$13\,{\mathrm{TeV}}$$ . The trigger system is crucial component experiment, responsible for selecting events interest recording rate approximately 1 kHz from up to 40 MHz collisions. This paper presents short overview changes and acquisition systems during first long shutdown LHC shows performance its components based on data.
A combined search for the Standard Model Higgs boson with ATLAS experiment at LHC using datasets corresponding to integrated luminosities from 1.04 fb-1 4.9 of pp collisions collected sqrt(s) = 7 TeV is presented. The mass ranges 112.9-115.5 GeV, 131-238 GeV and 251-466 are excluded 95% confidence level (CL), while range 124-519 expected be in absence a signal. An excess events observed around mH ~ 126 local significance 3.5 standard deviations (sigma). H -> gamma gamma, ZZ(*) lll'l' WW(*)...
Two-particle correlations in relative azimuthal angle (Δø) and pseudorapidity (Δη) are measured sqrt[s(NN)] = 5.02 TeV p+Pb collisions using the ATLAS detector at LHC. The measurements performed approximately 1 μb(-1) of data as a function transverse momentum (p(T)) energy (ΣE(T)(Pb)) summed over 3.1 < η 4.9 direction Pb beam. correlation function, constructed from charged particles, exhibits long-range (2 |Δ | 5) "near-side" (Δø ~ 0) that grows rapidly with increasing ΣE(T)(Pb). A...
Studies of the spin and parity quantum numbers Higgs boson are presented, based on proton-proton collision data collected by ATLAS experiment at LHC. The Standard Model spin-parity JP = 0+ hypothesis is compared with alternative hypotheses using decays H->gamma gamma, H -> ZZ 4 leptons H->WW l nu nu, as well combination these channels. analysed dataset corresponds to an integrated luminosity 20.7 fb-1 a centre-of-mass energy sqrt(s) 8 TeV. For 4-lepton decay mode corresponding 4.6 7 TeV...
The luminosity calibration for the ATLAS detector at LHC during pp collisions sqrt(s) = 7 TeV in 2010 and 2011 is presented. Evaluation of scale performed using several luminosity-sensitive detectors, comparisons are made long-term stability accuracy this applied to TeV. A uncertainty Delta L/L +/- 3.5% obtained 47 pb-1 data delivered 2010, an 1.8% 5.5 fb-1 2011.
Measurements are presented from proton–proton collisions at centre-of-mass energies of , 2.36 and 7 TeV recorded with the ATLAS detector LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum pseudorapidity relationship between mean multiplicity measured. in different regions phase space shown, providing diffraction-reduced measurements as well more inclusive ones. observed distributions corrected to...
Combined measurements of Higgs boson production cross sections and branching fractions are presented. The combination is based on the analyses decay modes $H \to \gamma\gamma$, $ZZ^\ast$, $WW^\ast$, $\tau\tau$, $b\bar{b}$, $\mu\mu$, searches for decays into invisible final states, off-shell production. Up to $79.8$ fb$^{-1}$ proton-proton collision data collected at $\sqrt{s}=$ 13 TeV with ATLAS detector used. Results presented gluon-gluon fusion vector-boson processes, associated vector...
Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at sqrt(s_NN) = 2.76 TeV with the ATLAS detector LHC, based on an integrated luminosity approximately 8 mb^-1. This is characterized via a Fourier expansion distribution particles in angle (phi), coefficients v_n denoting magnitude anisotropy. Significant v_2-v_6 values obtained as function transverse momentum (0.5<pT<20 GeV), pseudorapidity (|eta|<2.5) and centrality using event plane...
The large rate of multiple simultaneous proton--proton interactions, or pile-up, generated by the Large Hadron Collider in Run 1 required development many new techniques to mitigate adverse effects these conditions. This paper describes methods employed ATLAS experiment correct for impact pile-up on jet energy and shapes, presence spurious additional jets, with a primary focus 20.3 fb$^{-1}$ data sample collected at centre-of-mass $\sqrt{s} = 8$ TeV. correction that incorporate sophisticated...
A search for squarks and gluinos in final states containing jets, missing transverse momentum no electrons or muons is presented. The data were recorded by the ATLAS experiment s=7TeV proton–proton collisions at Large Hadron Collider. No excess above Standard Model background expectation was observed 35pb−1 of analysed data. Gluino masses below 500 GeV are excluded 95% confidence level simplified models only first two generations, a gluino octet massless neutralino. exclusion increases to...
Proton–proton collisions at $\sqrt{s}=7$ TeV and heavy ion $\sqrt{s_{NN}}=2.76$ were produced by the LHC recorded using ATLAS experiment’s trigger system in 2010. The is designed with a maximum bunch crossing rate of 40 MHz to record approximately 200 these per second. selects events rapidly identifying signatures muon, electron, photon, tau lepton, jet, B meson candidates, as well global event signatures, such missing transverse energy. An overview system, evolution during 2010 performance...
This paper describes a measurement of the $Z/\gamma^*$ boson transverse momentum spectrum using ATLAS proton-proton collision data at centre-of-mass energy $\sqrt{s}$ = 7 TeV LHC. The is performed in $Z/\gamma^* \rightarrow e^+e^-$ and \mu^+\mu^-$ channels, corresponding to an integrated luminosity 4.7 fb$^{-1}$. Normalized differential cross sections as function are measured for momenta up 800 GeV. inclusively rapidities 2.4, well three rapidity bins. channel results combined, compared...
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The uses 20.3 fb $${}^{-1}$$ $$\sqrt{s}=8$$ TeV data collected 2012 the ATLAS detector at LHC. Events required to have least one $$p_{\mathrm {T}}> 120$$ GeV no leptons. Nine signal regions considered increasing requirements between $$E_{\mathrm {T}}^{\mathrm {miss}}>150$$ {miss}}> 700$$ GeV. Good agreement is observed number events Standard Model expectations....
The measurement of missing transverse momentum in the ATLAS detector, described this paper, makes use full event reconstruction and a calibration based on reconstructed physics objects. performance is evaluated using data collected pp collisions at centre-of-mass energy 7 TeV 2010. Minimum bias events with jets hadrons are used from samples corresponding to an integrated luminosity about 0.3 nb−1 600 respectively, together containing Z boson decaying two leptons (electrons or muons) W lepton...
The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton–proton collision data a centre-of-mass of $$\sqrt{s}=7$$ TeV corresponding to an integrated luminosity $$4.7$$ $$\,\,\text{ fb }^{-1}$$ . Jets reconstructed from deposits forming topological clusters calorimeter cells anti- $$k_{t}$$ algorithm distance parameters $$R=0.4$$ or $$R=0.6$$ , calibrated MC simulations. A residual JES correction is applied account...
This paper describes the measurement of elliptic flow charged particles in lead-lead collisions at sqrt(s_NN) = 2.76 TeV using ATLAS detector Large Hadron Collider (LHC). The results are based on an integrated luminosity approximately 7 ub^-1. Elliptic is measured over a wide region pseudorapidity, |eta| < 2.5, and broad range transverse momentum, 0.5 p_T 20 GeV. parameter v_2 obtained by correlating individual tracks with event plane energy deposited forward calorimeters. As function...
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The uses proton-proton collision data corresponding to integrated luminosity 36.1 fb−1 at centre-of-mass energy 13 TeV collected 2015 2016 the ATLAS detector Large Hadron Collider. Events required have least one above 250 GeV no leptons (e or μ). Several signal regions considered increasing requirements on GeV. Good agreement is observed between number events...
Abstract The algorithms used by the ATLAS Collaboration during Run 2 of Large Hadron Collider to identify jets containing b -hadrons are presented. performance is evaluated in simulation and efficiency with which these measured collision data. measurement uses a likelihood-based method sample highly enriched $$t{\bar{t}}$$ <mml:math...
ATLAS has measured two-particle correlations as a function of relative azimuthal-angle, $\Delta \phi$, and pseudorapidity, \eta$, in $\sqrt{s}$=13 2.76 TeV $pp$ collisions at the LHC using charged particles pseudorapidity interval $|\eta|$<2.5. The correlation functions evaluated different intervals charged-particle multiplicity show multiplicity-dependent enhancement \phi \sim 0$ that extends over wide range $\Delta\eta$, which been referred to "ridge". Per-trigger-particle yields,...
The performance of the missing transverse momentum (E$_{T}^{miss}$) reconstruction with ATLAS detector is evaluated using data collected in proton-proton collisions at LHC a center-of-mass energy 13 TeV 2015. To reconstruct E$_{T}^{miss}$, fully calibrated electrons, muons, photons, hadronically decaying $\tau$-leptons, and jets reconstructed from calorimeter deposits charged-particle tracks are used. These combined soft hadronic activity measured by not associated hard objects. Possible...
A search for the decay of Standard Model Higgs boson into a $b\bar{b}$ pair when produced in association with $W$ or $Z$ is performed ATLAS detector. The data, corresponding to an integrated luminosity 79.8 $\mathrm{fb}^{-1}$ were collected proton-proton collisions during Run 2 Large Hadron Collider at centre-of-mass energy 13 TeV. For mass 125 GeV, excess events over expected background from other processes found observed (expected) significance 4.9 (4.3) standard deviations. combination...