C. Lazzaro
A5004159266- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Geophysics and Sensor Technology
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Statistical and numerical algorithms
- Advanced Frequency and Time Standards
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Cold Atom Physics and Bose-Einstein Condensates
- Superconducting Materials and Applications
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Seismology and Earthquake Studies
- Mechanical and Optical Resonators
- Computational Physics and Python Applications
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2015-2024
University of Padua
2020-2024
Université Paris Cité
2023
Laboratoire AstroParticule et Cosmologie
2023
Centre National de la Recherche Scientifique
2023
Istituto Nazionale di Fisica Nucleare
2013-2021
University of Massachusetts Amherst
2015-2021
Gran Sasso Science Institute
2019
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2019
University of Milano-Bicocca
2019
A bstract The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured velocity of neutrinos from CERN CNGS beam over a baseline about 730 km. measurement is based on data taken by in years 2009, 2010 and 2011. Dedicated upgrades timing system detector, as well high precision geodesy campaign for baseline, allowed reaching comparable systematic statistical accuracies. An arrival time muon with respect to one computed assuming speed light vacuum $ \left( {6.5\pm...
We present a method for detection and reconstruction of the gravitational-wave (GW) transients with networks advanced detectors. Originally designed to search initial GW detectors, it uses significantly improved algorithms, which enhances both low-latency searches rapid localization events electro-magnetic followup high confidence broad range transient sources. In paper we analytic framework method. Following short description core analysis introduce novel approach polarization from pattern...
The OPERA neutrino detector in the underground Gran Sasso Laboratory (LNGS) has been designed to perform first detection of oscillations direct appearance mode through study $\nu_\mu\rightarrow\nu_\tau$ channel. hybrid apparatus consists an emulsion/lead target complemented by electronic detectors and it is placed high energy long-baseline CERN LNGS beam (CNGS) 730 km away from source. Runs with CNGS neutrinos were successfully carried out 2008 2009. After a brief description beam,...
coherent WaveBurst (cWB) is a highly configurable pipeline designed to detect broad range of gravitational-wave (GW) transients in the data worldwide network GW detectors. The algorithmic core cWB time–frequency analysis with Wilson–Daubechies–Meyer wavelets aimed at identification events without prior knowledge signal waveform. has been active development since 2003 and it used analyze all scientific collected by LIGO-Virgo detectors ever since. On September 14, 2015, low-latency search...
A new method of momentum measurement charged particles through multiple Coulomb scattering (MCS) in the OPERA lead-emulsion target is presented. It based on precise measurements track angular deviations carried out thanks to very high resolution nuclear emulsions. The algorithm has been tested with Monte Carlo pions. results are found describe within expected uncertainties data obtained from test beams. We also present a comparison muon momenta evaluated MCS those determined by electronic...
Hardware injections are simulated gravitational-wave signals added to the Laser Interferometer Gravitational-wave Observatory (LIGO). The detectors' test masses physically displaced by an actuator in order simulate effects of a gravitational wave. signal initiates control-system response which mimics that true This provides end-to-end LIGO's ability observe waves. analyses used detect and characterize exercised with hardware injections. By looking for discrepancies between injected recovered...
Most compact binary systems are expected to circularize before the frequency of emitted gravitational waves (GWs) enters sensitivity band ground based interferometric detectors. However, several mechanisms have been proposed for formation systems, which retain eccentricity throughout their lifetimes. Since no matched-filtering algorithm has developed extract continuous GW signals from binaries on orbits with low moderate values eccentricity, and available algorithms detect quasicircular...
This paper presents a search for generic short-duration gravitational-wave (GW) transients (or GW bursts) in the data from third observing run of Advanced LIGO and Virgo. We use coherent WaveBurst (cWB) pipeline enhanced with decision-tree classification algorithm more efficient separation signals noise transients. The machine-learning (ML) is trained on representative set events simulated stochastic that are not correlated any known signal model. training procedure preserves...
The OPERA experiment is based on a hybrid technology combining electronic detectors and nuclear emulsions. collected muon-neutrino interactions during the 2008 2009 physics runs of CNGS neutrino beam, produced at CERN with an energy range about 5-35 GeV. A total $5.3 \times 10^{19}$ protons target equivalent luminosity has been analysed detectors: scintillator strips trackers magnetic muon spectrometers equipped resistive plate gas chambers drift tubes, allowing detailed reconstruction...
The OPERA neutrino detector in the underground Gran Sasso Laboratory (LNGS) was designed to perform first detection of oscillations appearance mode through study νμ → ντ oscillations. apparatus consists an emulsion/lead target complemented by electronic detectors and it is placed high energy long-baseline CERN LNGS beam (CNGS) 730 km away from source. Runs with CNGS neutrinos were successfully carried out 2007 2008 fully operational its related facilities for emulsion handling analysis....
A bstract In spring 2012 CERN provided two weeks of a short bunch proton beam dedicated to the neutrino velocity measurement over distance 730 km. The OPERA experiment at underground Gran Sasso Laboratory used an upgraded setup compared 2011 measurements, improving time accuracy. An independent timing system based on Resistive Plate Chambers was exploited providing accuracy ~1 ns. Neutrino and anti-neutrino contributions were separated using information by magnetic spectrometers. new...
To optimise the design of light readout in ArDM 1-ton liquid argon dark matter detector, a range reflector and WLS coating combinations were investigated several small setups, where scintillation was generated by radioactive sources gas at normal temperature pressure shifted into blue region tetraphenyl butadiene (TPB). Various thicknesses TPB deposited spraying vacuum evaporation onto specular 3M{\small\texttrademark}-foil diffuse Tetratex{\small\textregistered} (TTX) substrates. Light...
On May 21, 2019 Advanced LIGO and Virgo detectors observed a gravitational-wave transient GW190521, the heaviest binary black-hole merger detected to date with remnant mass of 142$\,$M$_\odot$ that was published recently. This observation is first strong evidence for existence intermediate-mass black holes. The significance this determined by coherent WaveBurst (cWB) - search algorithm, which identified GW190521 minimal assumptions on its source model. In paper, we demonstrate capabilities...
Neutron stars are known to show accelerated spin-up of their rotational frequency called a glitch. Highly magnetized rotating neutron (pulsars) frequently observed by radio telescopes (and in other frequencies), where the glitch is as irregular arrival times pulses which otherwise very regular. A an isolated star can excite fundamental ($f$)-mode oscillations lead gravitational wave generation. This signal associated with stellar fluid has damping time 10--200 ms and occurs at range between...
New methods for efficient and unambiguous interconnection between electronic position sensitive detectors target units based on nuclear photographic emulsion films have been developed. The application to the OPERA experiment, that aims at detecting νμ⇌ντ oscillations in CNGS neutrino beam, is reported this paper. In order reduce background due latent tracks collected before installation detector, on-site large-scale treatments of emulsions (''refreshing'') applied. Changeable Sheet (CSd)...
The Argon Dark Matter (ArDM-1t) experiment is a ton-scale liquid argon (LAr) double-phase time projection chamber designed for direct searches. Such device allows to explore the low energy frontier in LAr with charge imaging detector. ionization extracted from into gas phase and there amplified by use of Large Electron Multiplier order reduce detection threshold. Direct fine spatial granularity, combined measurement amplitude evolution associated primary scintillation light, provide powerful...
When the energy content of a resonant mode crystalline solid in thermodynamic equilibrium is directly measured, assuming that quantum effects can be neglected it coincides with temperature except for proportionality factor. This due to principle equipartition and hypothesis. However, most natural systems found nature are not thus cannot taken granted. We measured extent which low-frequency modes vibration defy equipartition, presence steady state heat flux, even close equilibrium. found,...
In this paper, we investigate the morphology of events from GWTC-1 catalog compact binary coalescences as reconstructed by a method based on coherent excess power: use an open-source version WaveBurst (cWB) analysis pipeline, which does not make waveform models. The response LIGO-Virgo network detectors is estimated using loose bounds duration and bandwidth signal. This pipeline reproduces same results that are reported for cWB in recent publications LIGO Virgo collaborations. particular,...
Standard detection and analysis techniques for transient gravitational waves make the assumption that detector data contains, at most, one signal any time. As detectors improve in sensitivity, this will no longer be valid. In paper we examine how current search behave under presence of more than signal. We perform searches on simulated sets containing time-overlapping compact binary coalescences. This includes a modeled matched filter (pycbc) an unmodeled coherent search, WaveBurst (cwb)....
The OPERA detector at the Gran Sasso underground laboratory (LNGS) was used to measure atmospheric muon charge ratio $R_{\mu}=N_{\mu^{+}}/N_{\mu^{-}}$ in TeV energy region. We analyzed 403069 muons corresponding 113.4 days of livetime during 2008 CNGS run. computed separately for single and multiple events order select different regions primary cosmic ray spectrum test R μ dependence on composition. measured values were corrected taking into account charge-misidentification errors. Data have...
The OPERA neutrino experiment in the underground Gran Sasso Laboratory (LNGS) was designed to perform first detection of oscillations direct appearance mode ν µ → τ channel, signature being identification -lepton created its charged current interaction.
Gravitational wave echoes may appear following a compact binary coalescence if the remnant is an ``exotic object.'' Exotic objects are proposed alternatives to black holes of Einstein's general relativity theory and predicted possess reflective boundaries. This work reports search for gravitational transients (GWTs) generic morphology occurring shortly after ($\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{s}$) hole (BBH) mergers, therefore targeting all echo models. We investigated times...
ArDM-1t is the prototype for a next generation WIMP detector measuring both scintillation light and ionization charge from nuclear recoils in 1-ton liquid argon target. The goal to reach minimum recoil energy of 30 keVr detect recoiling nuclei. In this paper we describe experimental concept present results on detection system, tested first time ArDM surface at CERN. With preliminary incomplete set PMTs, yield zero electric field found be between 0.3-0.5 phe/keVee depending position within...
Abstract Gravitational waves (GWs) emitted during the coalescence of binary neutron star (BNS) systems carry information about equation state (EoS) describing extremely dense matter inside stars (NSs). In particular, EoS determines fate after merger: a prompt collapse to black hole (BH), or formation NS remnant that is either stable survives up few seconds before collapsing BH. Determining evolution BNS system will therefore place strong constraints on EoS. We present morphology-independent...
The quest to observe gravitational waves challenges our ability discriminate signals from detector noise. This issue is especially relevant for transient searches with a robust eyes wide open approach, the so called all-sky burst searches. Here we show how signal classification methods inspired by broad astrophysical characteristics can be implemented in preserving their generality. In case study, apply multivariate analyses based on artificial neural networks classify emitted compact binary...