A5054307537- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Muon and positron interactions and applications
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear physics research studies
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
- Particle accelerators and beam dynamics
- Oil and Gas Production Techniques
- Astrophysics and Cosmic Phenomena
- Metallurgy and Material Forming
- High-pressure geophysics and materials
Paul Scherrer Institute
2002-2016
University of Genoa
2010
Vifor Pharma (Switzerland)
1990-2000
University of Neuchâtel
1993-1999
Yale University
1992-1993
Brookhaven National Laboratory
1987-1993
University of Maryland, College Park
1993
University of Washington
1993
Population Services International
1989
Swiss Federal Nuclear Safety Inspectorate
1982-1985
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.
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
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...
A sample of 4 x 10(5) events from the decay K(+)-->pi(+)pi(-)e(+)nu(e) (K(e4)) has been collected in experiment E865 at Brookhaven Alternating Gradient Synchrotron. The analysis these data yields new measurements K(e4) branching ratio [(4.11+/-0.01+/-0.11) 10(-5)], s-wave pi scattering length [a(0)(0) = 0.216+/-0.013(stat)+/-0.004(syst)+/-0.005(theor)], and form factors F, G, H hadronic current their dependence on invariant mass.
The SINDRUM II spectrometer at Paul Scherrer Institute is used in a search for coherent $\ensuremath{\mu}\ensuremath{\rightarrow}e$ conversion muonic atoms. We report on measurement lead, which resulted...
We report experimental details and results of a new measurement the decay K+→π+π−e+νe(Ke4). A sample more than 400,000Ke4 events with low background has been collected by Experiment 865 at Brookhaven Alternate Gradient Synchrotron. From these data, branching ratio (4.11±0.01±0.11)×10−5 ππ invariant mass dependence form factors F,G, H weak hadronic current as well phase shift difference δ00−δ11 for scattering were extracted. Using constraints based on analyticity chiral symmetry, value...
A search for lepton flavor violating decays, K+ --> mu+ pi-, e+ pi+ mu-, and pi0 was performed using the data collected in Experiment E865 at Brookhaven Alternating Gradient Synchrotron. No signal found any of decay modes. At 90% confidence level, branching ratios are less than 3.0x10(-9), 6.4x10(-10), 5. 2x10(-10), 5.0x10(-10), 3.4x10(-9), respectively.
The rate of nuclear muon capture by the proton has been measured using a new technique based on time projection chamber operating in ultraclean, deuterium-depleted hydrogen gas, which is key to avoiding uncertainties from muonic molecule formation. hyperfine singlet ground state μp atom was obtained difference between μ− disappearance and world average for μ+ decay rate, yielding ΛS=725.0±17.4 s−1, induced pseudoscalar coupling nucleon, gP(q2=−0.88m2μ)=7.3±1.1, extracted.Received 16 April...
The MuCap experiment at the Paul Scherrer Institute has measured rate L_S of muon capture from singlet state muonic hydrogen atom to a precision 1%. A beam was stopped in time projection chamber filled with 10-bar, ultra-pure gas. Cylindrical wire chambers and segmented scintillator barrel detected electrons decay. is determined difference between mu- disappearance free decay rate. result based on analysis 1.2 10^10 decays, which we extract = (714.9 +- 5.4(stat) 5.1(syst)) s^-1 derive...
E865 at the Brookhaven National Laboratory AGS collected about 70 000 K(+)(e3) events to measure branching ratio relative observed K+-->pi(+)pi(0), K+-->pi(0)micro(+)nu, and K+-->pi(+)pi(0)pi(0) decays. The pi(0) in all decays was detected using e(+)e(-) pair from pi(0)-->e(+)e(-)gamma decay no photons were required. Using 2002 Particle Data Group ratios for normalization decays, we obtain BR(K(+)(e3(gamma)))=(5.13+/-0.02(stat)+/-0.09(syst)+/-0.04(norm))%, where K(+)(e3(gamma)) includes...
A low-background sample of 10 300 events has been collected for the decay mode ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{e}^{+}{e}^{\ensuremath{-}}$ by experiment E865 at Brookhaven Alternating Gradient Synchrotron. The branching ratio is measured to be $[2.94\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.13(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{model})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$, vector nature this...
We present results of an experiment in which approximately 500 events the decay ${\mathit{K}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ were observed. have measured branching ratio for ${\mathit{K}}_{\mathrm{\ensuremath{\pi}}\mathit{e}\mathit{e}}^{+}$ to be (2.75\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.13)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}7}$ assuming a vector...
A search for the lepton-flavor number-violating decay ${K}^{+}$\ensuremath{\rightarrow}${\ensuremath{\pi}}^{+}$${\ensuremath{\mu}}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ has been conducted at Brookhaven Alternating Gradient Synchrotron. No candidates have found which would be consistent with this mode. An upper limit on branching ratio is placed 2.6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}10}$, can combined our previous result to yield an of...
We have searched for the decay process ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{A}^{0}$, where ${A}^{0}$ is any particle of mass less than 100 MeV/${\mathit{c}}^{2}$ decaying into ${e}^{+}{e}^{\ensuremath{-}}$. Upper limits branching ratio are given as a function and lifetime ${A}^{0}$. For lifetimes shorter ${10}^{\ensuremath{-}13}$ sec, limit 4.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}7}$ at 90% confidence level obtained.