M. Panareo
A5083994581- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Distributed and Parallel Computing Systems
- Magnetic confinement fusion research
- Precipitation Measurement and Analysis
- Ionosphere and magnetosphere dynamics
- Analog and Mixed-Signal Circuit Design
- Computational Physics and Python Applications
University of Salento
2015-2024
University of Salerno
2007-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2015-2024
Istituto Nazionale di Fisica Nucleare
2008-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari
2024
Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Salerno
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2008-2023
Polytechnic University of Bari
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2014-2023
University of California, Irvine
2022
The final results of the search for lepton flavour violating decay $$\mathrm {\mu }^+ \rightarrow \mathrm {e}^+ {\gamma }$$ based on full dataset collected by MEG experiment at Paul Scherrer Institut in period 2009–2013 and totalling $$7.5\times 10^{14}$$ stopped muons target are presented. No significant excess events is observed with respect to expected background a new upper limit branching ratio this $$ \mathcal{B} (\mu ^+ \mathrm{e}^+ \gamma ) < 4.2 \times 10^{-13}$$ (90 % confidence...
The analysis of a combined data set, totaling 3.6 × 10(14) stopped muons on target, in the search for lepton flavor violating decay μ(+) → e(+)γ is presented. collected by MEG experiment at Paul Scherrer Institut show no excess events compared to background expectations and yield new upper limit branching ratio this 5.7 10(-13) (90% confidence level). This represents four times more stringent than previous world best set MEG.
The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order increase reach of experiment by an magnitude level 6 x 10-14 branching ratio, total upgrade, involving substantial changes has been undertaken, known as II. We present both motivation upgrade and detailed overview design expected detector performance.
We present a new result based on an analysis of the data collected by MEG detector at Paul Scherrer Institut in 2009 and 2010, search lepton-flavor-violating decay μ+→e+γ. The likelihood combined sample, which corresponds to total 1.8×1014 muon decays, gives 90% C.L. upper limit 2.4×10−12 branching ratio μ+→e+γ decay, constituting most stringent existence this date.Received 31 July 2011DOI:https://doi.org/10.1103/PhysRevLett.107.171801© 2011 American Physical Society
Abstract The MEG II experiment, based at the Paul Scherrer Institut in Switzerland, reports result of a search for decay $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mtext>e</mml:mtext> </mml:mrow> <mml:mi>γ</mml:mi> </mml:math> from data taken first physics run 2021. No excess events over expected background is observed, yielding an...
The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 search for decay μ +→e+ γ by using one of most intense continuous + beams in world. This paper presents components: positron spectrometer, including a thin target, superconducting magnet, set drift chambers measuring muon vertex and momentum, timing counter time, liquid xenon detector photon energy, position time. trigger system, read-out electronics data acquisition system...
The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission Galactic plane at longitudes 25° < l 100° and latitudes . energy range covered this analysis, from ∼350 GeV ∼2 TeV, allows connection region explored Fermi with multi-TeV measurements carried out Milagro. Our analysis has focused on two selected regions plane, i.e., 40° 65° 85° (the Cygnus region), where Milagro observed an excess respect predictions...
Abstract The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is successor to which completed data taking 2013. started fully operational 2021, with goal of improving sensitivity $$\upmu ^+ \rightarrow {\textrm{e}}^+ \upgamma $$ <mml:math...
The ARGO-YBJ detector is an extensive air shower array that has been used to monitor the northern $\gamma$-ray sky at energies above 0.3 TeV from 2007 November 2013 January. In this paper, we present results of a survey in declination band $-10^{\circ}$ $70^{\circ}$, using data recorded over past five years. With integrated sensitivity ranging 0.24 $\sim$1 Crab units depending on declination, six sources have detected with statistical significance greater than 5 standard deviations. Several...
Measuring the anisotropy of arrival direction distribution cosmic rays provides important information on propagation mechanisms and identification their sources. In fact, flux is thought to be dependent only due presence nearby ray sources or particular magnetic-field structures. Recently, observation unexpected excesses at TeV energy down an angular scale as narrow $\ensuremath{\sim}10\ifmmode^\circ\else\textdegree\fi{}$ raised possibility that problem origin Galactic may addressed by...
Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called shadow). The shadow an important tool to determine performance of air shower array. Indeed, westward displacement center, due bending effect geomagnetic field on propagation cosmic rays, allows setting absolute rigidity scale primary particles inducing showers recorded detector. In addition, shape permits detector point spread function, while position at high energies evaluation pointing accuracy....
ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It operated high duty cycle and large field view. continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report long-term monitoring Mrk 421 over period from 2007 November to 2010 February. This source was observed by satellite-borne experiments Rossi X-ray Timing Explorer Swift in band. especially active first half 2008. Many flares are both γ-ray bands...
As one of the brightest active blazars in both X-ray and very high energy $\gamma$-ray bands, Mrk 501 is useful for physics associated with jets from AGNs. The ARGO-YBJ experiment monitoring it $\gamma$-rays above 0.3 TeV since November 2007. Starting October 2011 largest flare 2005 observed, which lasts to about April 2012. In this paper, a detailed analysis reported. During flaring episodes 17 22, 2011, an excess event rate over 6 $\sigma$ detected by direction 501, corresponding increase...
The extended TeV gamma-ray source ARGO J2031+4157 (or MGRO J2031+41) is positionally consistent with the Cygnus Cocoon discovered by Fermi-LAT at GeV energies in superbubble. Reanalyzing ARGO-YBJ data collected from 2007 November to 2013 January, angular extension and energy spectrum of are evaluated. After subtracting contribution overlapping sources, excess map fitted a two-dimensional Gaussian function square region 10° × 10°, finding σext= 18 ± 05. observed differential dN/dE = (2.5 0.4)...
The MEG experiment took data at the Paul Scherrer Institute in years 2009–2013 to test violation of lepton flavor conservation law, which originates from an accidental symmetry that Standard Model elementary particle physics has, and published most stringent limit on charged violating decay μ+→e+γ: BR(μ+→e+γ) <4.2×10−13 90% confidence level. detector has been upgraded order reach a sensitivity 6×10−14. basic principle II is achieve highest possible using full muon beam intensity (7×107...
Abstract The cylindrical drift chamber is the most innovative part of MEG II detector, upgraded version experiment. differs from one because it a single volume structure, instead segmented one, chosen to improve its resolutions and efficiency in detecting low energy positrons muon decays at rest. In this paper, we show characteristics performances fundamental apparatus discuss impact higher resolution on sensitivity Because structure high quality will be cornerstone development an ideal...
The proton-air cross section in the energy range 1--100 TeV has been measured by ARGO-YBJ cosmic ray experiment. analysis is based on primary flux attenuation for different atmospheric depths (i.e. zenith angles) and exploits detector capabilities of selecting shower development stage means hit multiplicity, density lateral profile measurements at ground. effects fluctuations, contribution heavier primaries uncertainties hadronic interaction models, have taken into account. results used to...
We report the observation of TeV gamma-rays from Cygnus region using ARGO-YBJ data collected 2007 November to 2011 August. Several sources are located in this including two bright extended MGRO J2019+37 and J2031+41. According Milagro set, at 20 is most significant source apart Crab Nebula. No signal detected by experiment, derived flux upper limits 90% confidence level for all events above 600 GeV with medium energy 3 lower than flux, implying that might be variable hard identified as a...
The ARGO-YBJ experiment detects extensive air showers in a wide energy range by means of full-coverage detector which is stable data taking its full configuration since November 2007 at the YBJ International Cosmic Ray Observatory (4300 m a.s.l., Tibet, People's Republic China). In this paper measurement light-component spectrum primary cosmic rays region $(5\textdiv{}200)\text{ }\text{ }\mathrm{TeV}$ reported. method exploited to analyze experimental based on Bayesian procedure. measured...
The ARGO-YBJ air shower detector monitored the Crab Nebula gamma ray emission from 2007 November to 2013 February. integrated signal, consisting of $\sim$3.3 $\times$ 10$^5$ events,reached statistical significance 21.1 standard deviations. obtained energy spectrum in range 0.3-20 TeV can be described by a power law function dN/dE = I$_0$ (E / 2 TeV)$^{-\alpha}$, with flux normalization (5.2 $\pm$ 0.2) 10$^{-12}$ photons cm$^{-2}$ s$^{-1}$ TeV$^{-1}$ and $\alpha$ 2.63 0.05, corresponding an...