A5114376710- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- CCD and CMOS Imaging Sensors
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Nuclear physics research studies
- Muon and positron interactions and applications
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Radiation Therapy and Dosimetry
- Magnetic confinement fusion research
- Mechanical and Optical Resonators
- Stochastic processes and financial applications
- Cold Fusion and Nuclear Reactions
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015-2024
Istituto Nazionale di Fisica Nucleare
2017-2024
University of Pisa
2009-2024
National Agency for New Technologies, Energy and Sustainable Economic Development
2024
ENEA Frascati Research Centre
2024
Budker Institute of Nuclear Physics
2015-2022
Sapienza University of Rome
2009-2022
Universidade Estadual de Campinas (UNICAMP)
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2022
Paul Scherrer Institute
2011-2021
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...
Abstract The workshop “Shedding light on X17” brings together scientists looking for the existence of a possible new particle, often referred to as X17. This hypothetical particle can explain resonant structure observed at $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 17 MeV in invariant mass electron-positron pairs, produced after excitation nuclei such $$^8\hbox {Be}$$ <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>8</mml:mn> </mml:msup>...
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 search for a novel technology able to detect and reconstruct nuclear electron recoil events with the energy of few keV has become more important now that large regions high-mass dark matter (DM) candidates have been excluded. Moreover, detector sensitive incoming particle direction will be crucial in case DM discovery open possibility studying its properties. Gaseous time projection chambers (TPC) optical readout are very promising detectors combining detailed event information provided...
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...
This letter of intent proposes an experiment to search for electric dipole moment the muon based on frozen-spin technique. We intend exploit high field, $E=1{\rm GV/m}$, experienced in rest frame with a momentum $p=125 {\rm MeV/}c$ when passing through large magnetic field $|\vec{B}|=3{\rm T}$. Current fluxes at $μ$E1 beam line permit improved sensitivity $σ(d_μ)\leq 6\times10^{-23}e{\rm cm}$, about three orders magnitude more than current upper limit $|d_μ|\leq1.8\times10^{-19}e{\rm...
Abstract We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, $$\upmu ^+ \rightarrow \mathrm {e}^+\mathrm {X}, {X} \upgamma \ $$ <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:mi>e</mml:mi> </mml:mrow> <mml:mi>X</mml:mi> <mml:mo>,</mml:mo> <mml:mi>γ</mml:mi> <mml:mspace /> </mml:math> . This uses dataset resulting from...
In April 2021, scientists active in muon physics met to discuss and work out the case for new High-Intensity Muon Beams (HIMB) project at PSI that could deliver of order $10^{10}$\,s$^{-1}$ surface muons experiments. Ideas concrete proposals were further substantiated over following months assembled present document. The high intensities will allow completely experiments with considerable discovery potential unique sensitivities. is outstanding extremely rich, ranging from fundamental...
Optical readout of GEM based devices by means high granularity and low noise CMOS sensors allows to obtain very interesting tracking performance. Space resolution the order tens μm were measured on plane along with an energy 20%÷30%. The main limitation is represented their poor information about time structure event. In this paper, use a concurrent light suitable photomultiplier acquisition electric signal induced electrode are exploited provide necessary timing informations. analysis PMT...
We present measurements of drift velocities and mobilities some innovative negative ion gas mixtures at nearly atmospheric pressure based on SF$_{6}$ as electronegative capture agent pure various pressures, performed with the NITEC detector. is a Time Projection Chamber 5 cm distance readout by GEMPix, triple thin GEMs coupled to Quad-Timepix chip, directly sensitive deposited charge each 55 $\times$ $\mu$m$^2$ pixel. Our results contribute expanding knowledge use extend possibility...
The search for the Lepton Flavor Violating decay mu into e gamma will reach an unprecedented level of sensitivity within next five years thanks to MEG-II experiment. This experiment take data at Paul Scherrer Institut where continuous muon beams are delivered a rate about 10^8 muons per second. On same time scale, accelerator upgrades expected in various facilities, making it feasible have with intensity 10^9 or even 10^10 We investigate experimental limiting factors that define ultimate...
Drift chambers operated with helium-based gas mixtures represent a common solution for tracking charged particles keeping the material budget in sensitive volume to minimum. The drawback of this is worsening spatial resolution due primary ionisation fluctuations, which limiting factor high granularity drift like MEG II tracker. We report on measurements performed three different prototypes chamber aimed at determining achievable single-hit resolution. were helium/isobutane and exposed cosmic...
The CYGNO project has the goal to use a gaseous TPC with optical readout detect dark matter and solar neutrinos low energy threshold directionality. demonstrator will consist of 1 m 3 volume filled He:CF 4 gas mixture at atmospheric pressure. Optical high granularity CMOS sensors, combined fast light detectors, provide detailed reconstruction event topology. This allow discriminate nuclear recoil signal from background, mainly represented by electron recoils induced radioactivity. Thanks...
The search for a novel technology able to detect and reconstruct nuclear recoil events in the keV energy range has become more important as long vast regions of high mass WIMP-like Dark Matter candidate have been excluded. Gaseous Time Projection Chambers (TPC) with optical readout are very promising combining complete event information provided by TPC technique sensitivity granularity last generation scientific light sensors. A an amplification at anode obtained Gas Electron Multipliers...