A. Giammanco
A5073140876- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Nuclear reactor physics and engineering
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
- Radiation Effects in Electronics
- Scientific Computing and Data Management
- Nuclear physics research studies
UCLouvain
2016-2025
Institute of High Energy Physics
2022-2024
University of Antwerp
2014-2024
A. Alikhanyan National Laboratory
2022-2024
Campbell Collaboration
2023
Research Network (United States)
2023
Universal Scientific Education and Research Network
2023
Centro Brasileiro de Pesquisas Físicas
2023
Council of Science Editors
2022
Centre for Cosmology and Particle Physics Phenomenology
2021
The version 3.0 of the Delphes fast-simulation is presented. goal to allow simulation a multipurpose detector for phenomenological studies. includes track propagation system embedded in magnetic field, electromagnetic and hadron calorimeters, muon identification system. Physics objects that can be used data analysis are then reconstructed from simulated response. These include tracks calorimeter deposits high level such as isolated electrons, jets, taus, missing energy. new modular approach...
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range pseudorapidity (eta) azimuthal angle (phi). Short-range Delta(eta), which studied minimum bias events, characterized simple "independent cluster" parametrization order to quantify their strength (cluster size) extent eta decay width). Long-range differentially as...
Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied with the CMS detector LHC, using data sample corresponding to an integrated luminosity 6.7 inverse microbarns. Jets are reconstructed deposited calorimeters and as function collision centrality. With increasing centrality, striking imbalance dijet transverse momentum is observed, consistent jet quenching. The observed effect extends from lower cut-off used this study (jet = 120 GeV/c) up...
Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected proton-proton collisions at centre-of-mass 7TeV, corresponding to an integrated luminosity 36pb−1. The balance dijet γ/Z+jets events is used measure response detector, as well resolution. results presented for three different methods reconstruct jets: calorimeter-based approach, ``Jet-Plus-Track'' which improves measurement calorimeter jets by exploiting...
At the Large Hadron Collider, identification of jets originating from b quarks is important for searches new physics and measurements standard model processes. A variety algorithms has been developed by CMS to select b-quark based on variables such as impact parameters charged-particle tracks, properties reconstructed decay vertices, presence or absence a lepton, combinations thereof. The performance these measured using data proton-proton collisions at LHC compared with expectations...
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ are measured with the inner tracking system of CMS detector LHC. The charged-hadron yield is obtained by counting number reconstructed hits, hit pairs, fully charged-particle tracks. combination three methods gives a multiplicity per unit...
This report presents the capabilities of CMS experiment to explore rich heavy-ion physics programme offered by CERN Large Hadron Collider (LHC). The collisions lead nuclei at energies , will probe quark and gluon matter unprecedented values energy density. prime goal this research is study fundamental theory strong interaction — Quantum Chromodynamics (QCD) in extreme conditions temperature, density parton momentum fraction (low-x).
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at $\sqrt{s} = 0.9 $ 2.36 TeV. The data were collected with the CMS detector during LHC commissioning in December 2009. For non-single-diffractive interactions, average transverse momentum is measured to be 0.46 ± 0.01 (stat.) (syst.) GeV/c TeV 0.50 TeV, pseudorapidities between --2.4 +2.4. At these energies, densities central region, dN ch/dη||η|<0.5, 3:48...
A measurement of inclusive W and Z production cross sections in pp collisions at $ \sqrt {s} = 7 TeV is presented. The electron muon decay channels are analyzed a data sample collected with the CMS detector LHC corresponding to an integrated luminosity 36 pb−1. measured σ(pp → WX) × \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) 10.31 ± 0.02 (stat.) 0.09 (syst.) 0.10 (th.) 0.41 (lumi.) nb ZX) {{\text{Z}} {\ell^{+} }{\ell^{-} }} 0.974 0.007 0.018 0.039 nb, limited dilepton invariant...
Measurements of inclusive W and Z boson production cross sections in pp collisions at $ \sqrt {s} = 7 TeV are presented, based on 2.9 pb−1 data recorded by the CMS detector LHC. The measurements, performed electron muon decay channels, combined to give \sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \ell \nu } 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} 1.09 (lumi.) nb {\text{Z}}X} {Z {\ell^{+} }{\ell^{-} }} 0.931\pm...
A search for events with jets and missing transverse energy is performed in a data sample of $pp$ collisions collected at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ by the CMS experiment LHC. The analyzed corresponds to an integrated luminosity $1.14\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. In this search, kinematic variable ${\ensuremath{\alpha}}_{\mathrm{T}}$ used as main discriminator between genuine misreconstructed energy. No excess over standard model expectation found. Exclusion limits...
The measurement of the luminosity recorded by CMS detector installed at LHC interaction point 5, using proton-proton collisions s=13TeV in 2015 and 2016, is reported. absolute scale measured for individual bunch crossings beam-separation scans (the van der Meer method), with a relative precision 1.3 1.0% respectively. dominant sources uncertainty are related to residual differences between beam positions ones provided operational settings magnets, factorizability proton spatial density...
At the start of Run 2 in 2015, LHC delivered proton-proton collisions at a center-of-mass energy 13 TeV. During (years 2015-2018) eventually reached luminosity 2.1 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, almost three times that during 1 (2009-2013) and factor two larger than design value, leading to events with up mean about 50 simultaneous inelastic per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior 2016 improve selection physics challenging conditions posed by second...
Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at weak scale. When produced experiments such as Large Hadron Collider (LHC) CERN, these long-lived (LLPs) decay far from interaction vertex of primary proton-proton collision. Such LLP signatures distinct those promptly decaying targeted by majority searches for new physics LHC, often requiring customized techniques identify, example, significantly displaced vertices, tracks with...
Abstract The performance is presented of the reconstruction and identification algorithms for electrons photons with CMS experiment at LHC. reported results are based on proton-proton collision data collected a center-of-mass energy 13 TeV recorded in 2016–2018, corresponding to an integrated luminosity 136 fb^-1. Results obtained from lead-lead √(s NN )=5.02 also presented. Innovative techniques used reconstruct electron photon signals detector optimize resolution. Events final state...
Studies of on-shell and off-shell Higgs boson production in the four-lepton final state are presented, using data from CMS experiment at LHC that correspond to an integrated luminosity 80.2 fb−1 a center-of-mass energy 13 TeV. Joint constraints set on total width parameters express its anomalous couplings two electroweak vector bosons. These results combined with those obtained collected energies 7 8 TeV, corresponding luminosities 5.1 19.7 fb−1, respectively. Kinematic information decay...
Results are reported from a search for supersymmetric particles in the final state with multiple jets and large missing transverse momentum. The uses sample of proton-proton collisions at $\sqrt{s} =$ 13 TeV collected CMS detector 2016-2018, corresponding to an integrated luminosity 137 fb$^{-1}$, representing essentially full LHC Run 2 data sample. analysis is performed four-dimensional region defined terms number jets, tagged bottom quark scalar sum jet momenta, magnitude vector momenta....
With increasing instantaneous luminosity at the LHC come additional reconstruction challenges. At high luminosity, many collisions occur simultaneously within one proton-proton bunch crossing. The isolation of an interesting collision from "pileup" is needed for effective physics performance. In CMS Collaboration, several techniques capable mitigating impact these pileup have been developed. Such methods include charged-hadron subtraction, jet identification, isospin-based neutral particle...
Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production via gluon fusion, vector association with boson, and top quark-antiquark pair. The analysis performed using proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding an integrated luminosity 137 fb$^{-1}$, recorded by CMS experiment CERN LHC. An excess events over background expectation observed significance 3.0 standard deviations,...
A measurement of the mass Higgs boson in diphoton decay channel is presented. This analysis based on 35.9 fb$^{-1}$ proton-proton collision data collected during 2016 LHC running period, with CMS detector at a center-of-mass energy 13 TeV. refined calibration and new techniques have been used to improve precision this measurement. The measured be $m_\mathrm{H} =$ 125.78 $\pm$ 0.26 GeV. combined $m_\mathrm{H}$ already performed H $\to$ ZZ 4$\ell$ using same set, giving 125.46 0.16 result,...
A bstract search is presented for physics beyond the standard model (SM) using electron or muon pairs with high invariant mass. data set of proton-proton collisions collected by CMS experiment at LHC $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt></mml:math> = 13 TeV from 2016 to 2018 corresponding a total integrated luminosity up 140 fb − 1 analyzed. No significant deviation observed respect SM background expectations. Upper...
Measurements are presented of the Bs0→μ+μ− branching fraction and effective lifetime, as well results a search for B0→μ+μ− decay in proton-proton collisions at s=13TeV LHC. The analysis is based on data collected with CMS detector 2016–2018 corresponding to an integrated luminosity 140fb−1. Bs0 meson lifetime most precise single measurements date. No evidence has been found. All found be consistent standard model predictions previous measurements.
A bstract Three searches are presented for signatures of physics beyond the standard model (SM) in ττ final states proton-proton collisions at LHC, using a data sample collected with CMS detector $$ \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, corresponding to an integrated luminosity 138 fb − 1 . Upper limits 95% confidence level (CL) set on products branching fraction decay into τ leptons and cross...
Abstract Since the initial data taking of CERN LHC, CMS experiment has undergone substantial upgrades and improvements. This paper discusses detector as it is configured for third data-taking period Run 3, which started in 2022. The entire silicon pixel tracking was replaced. A new powering system superconducting solenoid installed. electronics hadron calorimeter upgraded. All muon electronic systems were upgraded, stations added, including a gas electron multiplier detector. precision...