G. Vasseur
A5042483299- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Astrophysics and Cosmic Phenomena
- Stochastic processes and statistical mechanics
- Nuclear reactor physics and engineering
- Distributed and Parallel Computing Systems
- Algorithms and Data Compression
- Radioactive Decay and Measurement Techniques
- Lanthanide and Transition Metal Complexes
- Nuclear Physics and Applications
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
CEA Paris-Saclay
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
Université Paris-Saclay
2008-2022
Institut National de Physique Nucléaire et de Physique des Particules
2018
Johns Hopkins University
2014
University of Pisa
2014
Budker Institute of Nuclear Physics
2014
Novosibirsk State Technical University
2014
Campbell Collaboration
2009-2013
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
We have observed the decays ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{0}$\ensuremath{\gamma} and ${\mathit{B}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{K}}^{\mathrm{*}}$(892${)}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}, which are evidence for quark-level process b\ensuremath{\rightarrow}s\ensuremath{\gamma}. The average branching fraction is...
We have fully reconstructed decays of both B0 and B- Mesons into final states containing either D, D*, D**, Psi, Psi', or Chi_{c1} mesons. This allows us to obtain new results on many physics topics including branching ratios, tests the factorization hypothesis, color suppression, resonant substructure, - mass difference.
Using the CLEO II detector, we have measured branching fractions for $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\Upsilon}(1S)$, $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\Upsilon}(2S)$, and cascade $\ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(2S)+X$,...
We report results from a search for the decays ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$, ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$, and ${\mathit{B}}^{0}$\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$. find 90% confidence level upper limits on branching fractions,...
Using the CLEO-II detector, we have obtained evidence for a new meson decaying to $D^0 K^+$. Its mass is $2573.2^{+1.7}_{-1.6}\pm 0.8\pm 0.5$ {}~MeV/$c^2$ and its width $16^{+5}_{-4}\pm 3$~MeV/$c^2$. Although do not establish spin parity, consistent with predictions an $L=1$, $S=1$, $J_P=2^+$ charmed strange state.
Using data from the CLEO II detector at CESR, we measure ${\cal B}(\tau^\pm\rightarrow h^\pm\pi^0\nu_\tau)$ where $h^\pm$ refers to either $\pi^\pm$ or $K^\pm$. We use three different methods this branching fraction. The combined result is h^\pm\pi^0\nu_\tau) = 0.2587 \pm 0.0012 0.0042$, in good agreement with Standard Model predictions. This result, combination other precision measurements, reduces significance of one-prong problem tau decays. A postscript version available through...
Branching ratios for the dominant Cabibbo-suppressed decays of $\tau$ lepton have been measured by CLEO~II in $e^+ e^-$ annihilation at CESR ($\sqrt{s} \sim 10.6$~GeV) using kaons with momenta below $0.7\ \rm GeV/c$. The inclusive branching ratio into one charged kaon is $(1.60 \pm 0.12 0.19)\%$. For exclusive decays, $B(\tau \to K^-) = (0.66 0.07 0.09)\%$, K^- \pi^0) (0.51 0.10 0.07)\%$, and, based on three events, \pi^0 < 0.3\%$ 90\% confidence level. These represent significant...
A limit on the tau neutrino mass ${\mathit{M}}_{\ensuremath{\nu}\mathrm{\ensuremath{\tau}}}$ is obtained from a study of decays in reaction ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\tau}}}^{+}$${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$ at center-of-mass energies \ensuremath{\sim}10.6 GeV. The result based an end-point analysis invariant spectrum decay products modes...
A measurement of the cross section for combined two-photon production charged pion and kaon pairs is performed using 1.2~$\rm fb^{-1}$ data collected by CLEO~II detector at Cornell Electron Storage Ring. The measured invariant masses system between 1.5 5.0 GeV/$c^2$, scattering angles more than $53^\circ$ away from $\gamma\gamma$ collision axis in center-of-mass frame. large background leptonic events suppressed utilizing CsI calorimeter conjunction with muon chamber system. reported...
Using data from CLEO II at the Cornell Electron Storage Ring we provide a new measurement of branching fraction for D0→π+π−, and present first measurements D0→π0π0 D+→π+π0, which is due to an isospin changing ΔI=3/2 transition. From these extract ratio amplitudes ‖A2/A0‖, cosine relative phase δ=δ2-δ0 between amplitudes, D→ππ decays. Unlike situation in kaon decay where A2 strongly suppressed, find ‖A2/A0‖=0.72±0.13±0.11 cosδ=0.14±0.13±0.09.Received 11 June...
Using the CLEO-II detector, branching ratio of Cabibbo suppressed decay ${\mathit{D}}^{+}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{0}$${\mathit{l}}^{+}$\ensuremath{\nu}, relative to favored ${\mathit{D}}^{+}$\ensuremath{\rightarrow}K${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{0}$${\mathit{l}}^{+}$\ensuremath{\nu}, is measured be...
The decay ${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$2${\mathrm{\ensuremath{\pi}}}^{0}$${\ensuremath{\nu}}_{\mathrm{\ensuremath{\tau}}}$ has been observed in ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ annihilation using the CLEO II detector at Cornell Electron Storage Ring. In a data sample...
A measurement of the cross section for γγ→pp¯ is performed at two-photon center-of-mass energies between 2.00 and 3.25 GeV. These results are obtained using e+e−→e+e−pp¯ events selected from 1.31 fb−1 data taken with CLEO II detector. The measured in reasonable agreement previous measurements excellent recent calculations based on a diquark model. However, leading order QCD Brodsky-Lepage formalism well below section.Received 1 September 1993DOI:https://doi.org/10.1103/PhysRevD.50.5484©1994...
We have searched for ${B}^{0}$ decays to two charged leptons and set 90% confidence level upper limits on the branching fractions: $B({B}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})<5.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}})<5.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$,...
The CLEO II detector is used to search for the production of ${\mathrm{\ensuremath{\chi}}}_{\mathit{c}2}$ states in two-photon interactions. We use signature ${\mathrm{\ensuremath{\chi}}}_{\mathit{c}2}$\ensuremath{\rightarrow}\ensuremath{\gamma}J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}${\mathit{l}}^{+}$${\mathit{l}}^{\mathrm{\ensuremath{-}}}$ with l=e,\ensuremath{\mu}. Using 1.49 ${\mathrm{fb}}^{\mathrm{\ensuremath{-}}1}$ data taken beam energies near 5.29 GeV, width...
We observe the Σc+ baryon decaying to Λc+π0 and measure mass difference M(Σc+)-M(Λc+) be 168.5±0.2 MeV/c2. also differences M(Σc++)-M(Λc+) M(Σc0-M(Λc+) with improved precision determine isospin splittings M(Σc++)-M(Σc0) M(Σc+)-M(Σc0) 1.1±0.4±0.1 MeV/c2 1.4±0.5±0.3 MeV/c2, respectively. Our results indicate that light quark does not dominate splitting in Σc.Received 24 June 1993DOI:https://doi.org/10.1103/PhysRevLett.71.3259©1993 American Physical Society
The DIRC is a new type of Cherenkov imaging device that will be used for the first time in BABAR detector at asymmetric B-factory, PEP-II. It based on total internal reflection and uses long, rectangular bars made from synthetic fused silica as radiator light guide. principles ring technique are explained results prototype program presented. Its choice particle identification system motivated, followed by discussion quartz properties design.
We have measured branching ratios for three Λc decay modes that a Σ+ in the final state. Two of observed modes, Λc→Σ+π0 and Λc+→Σ+ω, no external W-emission amplitudes. Their relative to pK−π+ mode are 0.20±0.03±0.03 0.54±0.13±0.06, respectively. also significantly improved measurement ratio previously Λc+→Σ+π+π−. find its be 0.74±0.07±0.09.Received 24 June 1993DOI:https://doi.org/10.1103/PhysRevLett.71.3255©1993 American Physical Society