C. Alpigiani
A5063988052- 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
- Distributed and Parallel Computing Systems
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Advanced Data Storage Technologies
- Superconducting Materials and Applications
- Big Data Technologies and Applications
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Structural Analysis of Composite Materials
- Multimedia Communication and Technology
- Scientific Computing and Data Management
- Particle accelerators and beam dynamics
- Advanced Frequency and Time Standards
- Digital Radiography and Breast Imaging
University of Washington
2016-2025
AGH University of Krakow
2016-2024
Jagiellonian University
2017-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2019-2024
Universidad Nacional de La Plata
2019-2024
Seattle University
2016-2024
Instituto de Física La Plata
2019-2024
Federación Española de Enfermedades Raras
2024
A. Alikhanyan National Laboratory
2024
SR Research (Canada)
2024
A measurement of the Higgs boson mass is presented based on combined data samples ATLAS and CMS experiments at CERN LHC in H→γγ H→ZZ→4ℓ decay channels. The results are obtained from a simultaneous fit to reconstructed invariant peaks two channels for experiments. measured masses individual found be consistent among themselves. mH=125.09±0.21 (stat)±0.11 (syst) GeV.Received 25 March 2015DOI:https://doi.org/10.1103/PhysRevLett.114.191803This article available under terms Creative Commons...
Combined ATLAS and CMS measurements of the Higgs boson production decay rates, as well constraints on its couplings to vector bosons fermions, are presented. The combination is based analysis five processes, namely gluon fusion, associated with a $W$ or $Z$ pair top quarks, six modes $H \to ZZ, WW$, $\gamma\gamma, \tau\tau, bb$, $\mu\mu$. All results reported assuming value 125.09 GeV for mass, result combined measurement by experiments. uses CERN LHC proton--proton collision data recorded...
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.
This article documents the performance of ATLAS muon identification and reconstruction using first LHC dataset recorded at $\sqrt{s}$ = 13 TeV in 2015. Using a large sample $J/\psi\to\mu\mu$ $Z\to\mu\mu$ decays from 3.2 fb$^{-1}$ $pp$ collision data, measurements efficiency, as well momentum scale resolution, are presented compared to Monte Carlo simulations. The efficiency is measured be close $99\%$ over most covered phase space ($|\eta|<2.5$ $5 < p_{T} 100$ GeV). isolation varies between...
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...
The reconstruction of the signal from hadrons and jets emerging proton-proton collisions at Large Hadron Collider (LHC) entering ATLAS calorimeters is based on a three-dimensional topological clustering individual calorimeter cell signals. cluster formation follows signal-significance patterns generated by electromagnetic hadronic showers. In this, algorithm implicitly performs noise suppression removing cells with insignificant signals which are not in close proximity to significant...
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...
The observation of Higgs boson production in association with a top quark pair ($t\bar{t}H$), based on the analysis proton-proton collision data at centre-of-mass energy 13 TeV recorded ATLAS detector Large Hadron Collider, is presented. Using corresponding to integrated luminosities up 79.8 fb$^{-1}$, and considering decays into $b\bar{b}$, $WW^*$, $\tau\tau$, $\gamma\gamma$, $ZZ^*$, observed significance 5.8 standard deviations, compared an expectation 4.9 deviations. Combined $t\bar{t}H$...
Searches for the electroweak production of charginos, neutralinos and sleptons in final states characterized by presence two leptons (electrons muons) missing transverse momentum are performed using 20.3 fb-1 proton-proton collision data at sqrt(s) = 8 TeV recorded with ATLAS experiment Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. Limits set on masses lightest chargino, next-to-lightest neutralino different lightest-neutralino mass hypotheses...
Jet energy scale measurements and their systematic uncertainties are reported for jets measured with the ATLAS detector using proton-proton collision data a center-of-mass of s=13 TeV, corresponding to an integrated luminosity 3.2 fb−1 collected during 2015 at LHC. Jets reconstructed from deposits forming topological clusters calorimeter cells, anti-kt algorithm radius parameter R=0.4. calibrated series simulation-based corrections in situ techniques. In techniques exploit transverse...
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$$ GeV. Good agreement is observed number events Standard Model expectations....
Combined analyses of the Higgs boson production and decay rates as well its coupling strengths to vector bosons fermions are presented. The combinations include results $H\to\gamma\gamma,\, ZZ^*,\, WW^*,\, Z\gamma,\, b\bar{b},\, \tau\tau$ $\mu\mu$ modes, constraints on associated with a pair top quarks off-shell boson. based LHC proton-proton collision datasets, integrated luminosities up 4.7 $\mathrm{fb}^{-1}$ at $\sqrt{s}=7$ TeV 20.3 $\sqrt{s}=8$ TeV, recorded by ATLAS detector in 2011...
A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by ATLAS experiment proton-proton collisions at a centre-of-mass energy $\sqrt{s}=$13 during Run 2 Large Hadron Collider correspond an integrated luminosity 139 fb$^{-1}$. functional form fitted dilepton invariant-mass distribution model contribution from background processes, generic signal shape used determine significance observed deviations this estimate. No...
The luminosity determination for the ATLAS detector at LHC during pp collisions $$\sqrt{s} =$$ 8 TeV in 2012 is presented. evaluation of scale performed using several luminometers, and comparisons between these detectors are made to assess accuracy, consistency long-term stability results. A uncertainty $$\delta \mathcal{L}/ \mathcal{L} = \pm 1.9\%$$ obtained $$22.7\,\mathrm {fb}^{-1}$$ collision data delivered 2012.
A search for squarks and gluinos in final states containing high-p T jets, missing transverse momentum no electrons or muons is presented. The data were recorded 2012 by the ATLAS experiment $$ \sqrt{s}=8 TeV proton-proton collisions at Large Hadron Collider, with a total integrated luminosity of 20.3 fb−1. Results are interpreted variety simplified specific supersymmetry-breaking models assuming that R-parity conserved lightest neutralino supersymmetric particle. An exclusion limit 95%...
A measurement of the production processes recently discovered Higgs boson is performed in two-photon final state using $4.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ proton-proton collisions data at $\sqrt{s}=7\text{ }\mathrm{TeV}$ and $20.3\text{ $\sqrt{s}=8\text{ collected by ATLAS detector Large Hadron Collider. The number observed decays to diphotons divided corresponding Standard Model prediction, called signal strength, found be...
This paper describes the reconstruction of electrons and photons with ATLAS detector, as employed for measurements searches exploiting complete LHC Run 2 dataset. An improved energy clustering algorithm is introduced, its implications measurement identification are discussed in detail. Corrections calibrations that affect performance, including calibration, isolation efficiencies, charge reconstructed electron candidates determined using up to 81 fb$^{-1}$ proton-proton collision data...
A search is conducted for new resonant and non-resonant high-mass phenomena in dielectron dimuon final states. The uses 36.1 fb−1 of proton-proton collision data, collected at $$ \sqrt{s}=13 TeV by the ATLAS experiment LHC 2015 2016. No significant deviation from Standard Model prediction observed. Upper limits 95% credibility level are set on cross-section times branching ratio resonances decaying into dileptons, which converted to lower resonance mass, up 4.1 E6-motivated Z ′ . Lower qqℓℓ...
Dijet events produced in LHC proton-proton collisions at a center-of-mass energy s=8 TeV are studied with the ATLAS detector using full 2012 data set, an integrated luminosity of 20.3 fb−1. masses up to about 4.5 probed. No resonancelike features observed dijet mass spectrum. Limits on cross section times acceptance set 95% credibility level for various hypotheses new phenomena terms or scale, as appropriate. This analysis excludes excited quarks below 4.06 TeV, color-octet scalars 2.70...
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The uses proton-proton collision data corresponding to integrated luminosity 36.1 fb−1 at centre-of-mass energy 13 TeV collected 2015 2016 the ATLAS detector Large Hadron Collider. Events required have least one above 250 GeV no leptons (e or μ). Several signal regions considered increasing requirements on GeV. Good agreement is observed between number events...
Abstract The algorithms used by the ATLAS Collaboration during Run 2 of Large Hadron Collider to identify jets containing b -hadrons are presented. performance is evaluated in simulation and efficiency with which these measured collision data. measurement uses a likelihood-based method sample highly enriched $$t{\bar{t}}$$ <mml:math...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
An improved measurement of the mass Higgs boson is derived from a combined fit to reconstructed invariant spectra decay channels H→γγ and H→ZZ∗→4ℓ. The analysis uses pp collision data sample recorded by ATLAS experiment at CERN Large Hadron Collider center-of-mass energies 7 TeV 8 TeV, corresponding an integrated luminosity 25 fb−1. measured value mH=125.36±0.37(stat)±0.18(syst) GeV. This result based on energy-scale calibrations for photons, electrons, muons as well other improvements,...
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,...