F. Grancagnolo
A5066199810- 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
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- CCD and CMOS Imaging Sensors
- advanced mathematical theories
- Analog and Mixed-Signal Circuit Design
- Nuclear physics research studies
- Plasma Diagnostics and Applications
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2015-2024
Istituto Nazionale di Fisica Nucleare
1986-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2003-2022
Joint Institute for Nuclear Research
2021
California Institute of Technology
1985-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2021
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1998-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2006-2021
Fermi National Accelerator Laboratory
2021
Yale University
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 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.
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...
We report a revised determination of charmed-D-meson absolute branching fractions based on complete reconstruction DD¯ events at the ψ(3770). Two backgrounds, Cabibbo-suppressed and multi-π0 D decays, are addressed in detail. The first measurement decay D0→K−π+π0π0 establishes sensitivity to hitherto unobserved modes. Removal both backgrounds reduces values our previously reported by (21-24)%, leaving their ratios largely unchanged. new unable account fully for deficit charm production...
A new technique is applied to data collected at the $\ensuremath{\psi}(3770)$ resonance derive charmed-$D$-meson branching fractions without relying on measurement of $D$-production cross sections. Measurements are presented for three decay modes ${D}^{0} ({K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}, {D}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}, \mathrm{and} {K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and four...
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...
Evidence is presented for a narrow state, called \ensuremath{\xi}, in the decay modes J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\xi}, \ensuremath{\xi}\ensuremath{\rightarrow}${K}^{+}$${K}^{\mathrm{\ensuremath{-}}}$, and \ensuremath{\xi}\ensuremath{\rightarrow}${K}_{S}^{0}$${K}_{S}^{0}$. In ${K}^{+}$${K}^{\mathrm{\ensuremath{-}}}$ mode, \ensuremath{\xi} has mass of 2.230\ifmmode\pm\else\textpm\fi{}0.006\ifmmode\pm\else\textpm\fi{}0.014 GeV/${c}^{2}$, width...
Measurements of the semileptonic branching ratios charmed ${D}^{+}$ and ${D}^{0}$ mesons are presented, from data collected at $\ensuremath{\psi}(3770)$ in Mark III detector SPEAR. From a sample events kinematically selected as ${D}^{+}{D}^{\ensuremath{-}}$ or ${D}^{0}{\overline{D}}^{0}$ pairs, $R({D}^{+}\ensuremath{\rightarrow}{e}^{+}+X)=(17.0\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}0.7)%$...
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...
We present an analysis of the decay J/ψ→γ4π in final states γπ+π−π+π− and γπ+π0π−π0. The branching fractions obtained are B(J/ψ→γπ+π−π+π−)= (3.05±0.08±0.45)×10−3 B(J/ψ→γπ+π0π−πo)=( 8.3±0.2±3.1)×10−3 for m4π less than 2 GeV/c2. 4π invariant-mass distributions extend from 1.0 to 3.0 GeV/c2, showing peaks at approximately 1.55 1.8 In state we find that ≊50% events below GeV/c2 pseudoscalar ρρ, product fraction which is determined be &→ρρ)= (4.7±0.3±0.9)×10−3. No other significant ρρ component...
We report the results of a search for leptonic decay ${\mathrm{D}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\mu}}}^{+}$${\ensuremath{\nu}}_{\mathrm{\ensuremath{\mu}}}$ using Mark III detector at SLAC ${\mathrm{e}}^{+}$${\mathrm{e}}^{\mathrm{\ensuremath{-}}}$ storage ring SPEAR. A data sample 9.3 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ collected \ensuremath{\psi}(3770) resonance yields no signal events, corresponding to 90%-confidence-level upper limit...
Pairs of $\ensuremath{\tau}$ leptons produced at $\sqrt{s}=3.77$ GeV have been studied in $e\ensuremath{\mu}$, $\mathrm{ee}$, and $\ensuremath{\mu}\ensuremath{\mu}$ final states. The leptonic branching ratios measured to be $B(\ensuremath{\tau}\ensuremath{\rightarrow}e\ensuremath{\nu}\ensuremath{\nu})=(18.2\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)%$...