F. Le Diberder
A5043599711- 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
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Stochastic processes and statistical mechanics
- International Science and Diplomacy
- Astrophysics and Cosmic Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Distributed and Parallel Computing Systems
- Advanced NMR Techniques and Applications
- Noncommutative and Quantum Gravity Theories
- Amino Acid Enzymes and Metabolism
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2024
Centre National de la Recherche Scientifique
2013-2022
Institut National de Physique Nucléaire et de Physique des Particules
2020-2022
Université Paris-Saclay
2004-2022
Université Paris-Sud
2008-2020
GANIL
1990-2020
University of California, Irvine
2020
Centre Hospitalier d'Orsay
2014-2015
Laboratoire d’Annecy de Physique des Particules
2004-2006
Laboratoire de Physique Nucléaire et de Hautes Énergies
2001
We search for single-photon events in 53 fb−1 of e+e− collision data collected with the BABAR detector at PEP-II B-Factory. look a single high-energy photon and large missing momentum energy, consistent production spin-1 particle A′ through process e+e−→γA′; A′→invisible. Such particles, referred to as "dark photons," are motivated by theories applying U(1) gauge symmetry dark matter. find no evidence such processes set 90% confidence level upper limits on coupling strength mass range mA′≤8...
Many models of physics beyond the Standard Model predict existence new Abelian forces with gauge bosons mediating interactions between "dark sectors" and Model. We report a search for dark boson Z' coupling only to second third generations leptons in reaction e+e- -> mu+mu- Z', using 514 fb-1 data collected by BABAR experiment. No significant signal is observed masses range 0.212 - 10 GeV. Limits on parameter g' as low 7x10^-4 are derived, leading improvements bounds compared those...
We search for the rare flavor-changing neutral current process $B^{+}\rightarrow K^{+}τ^{+}τ^{-}$ using data from BABAR experiment. The sample, collected at center-of-mass energy of $Υ{(4S)}$ resonance, corresponds to a total integrated luminosity 424 fb$^{-1}$ and 471 million $B\overline{B}$ pairs. reconstruct one $B$ meson, produced in $Υ{(4S)}\rightarrow B^{+} B^{-}$ decay, many hadronic decay modes activity compatible with K^{+} τ^{+}τ^{-}$ rest event. Each $τ$ lepton is required...
An angular analysis of the decay ${\overline{B} \rightarrow D^\ast \ell^- \overline{\nu}_\ell}$, $\ell\in\{e,\mu\}$, is reported using full $e^+e^-$ collision data set collected by \babar experiment at $\Upsilon(4S)$ resonance. One $B$ meson from ${\Upsilon(4S)\to B\overline{B}}$ fully reconstructed in a hadronic mode, which constrains kinematics and provides determination neutrino momentum vector. The semileptonic described di-lepton mass squared, $q^2$, three angles. first unbinned fit to...
We study the process $e^+e^- \to \pi^+\pi^-\eta \gamma$, where photon is radiated from initial state. About 8000 fully reconstructed events of this are selected BaBar data sample with an integrated luminosity 469~fb$^{-1}$. Using $\pi^+\pi^-\eta$ invariant mass spectrum we measure \pi^+\pi^-\eta$ cross section in $e^+e^-$ center-of-mass energy range 1.15 to 3.5 GeV. The well described by Vector-Meson Dominance model four $\rho$-like states. observe $49\pm9$ $J/\psi$ decay $\pi^+\pi^-\eta$,...
A study of the two-body decays B^{±}→X_{cc[over ¯]}K^{±}, where X_{cc[over ¯]} refers to one charmonium state, is reported by BABAR Collaboration using a data sample 424 fb^{-1}. The absolute determination branching fractions for these are significantly improved compared previous measurements. Evidence found decay B^{+}→X(3872)K^{+} at 3σ level. fraction B[B^{+}→X(3872)K^{+}]=[2.1±0.6(stat)±0.3(syst)]×10^{-4} measured first time. It follows that B[X(3872)→J/ψπ^{+}π^{-}]=(4.1±1.3)%,...
A dedicated measurement of additional radiation in e+e−→μ+μ−γ and e+e−→π+π−γ initial-state-radiation events is presented using the full BABAR data sample. For first time results are at next-to- next-to-next-to-leading order, with one two photons, respectively, for from initial final states. Comparison predictions phokhara afkqed Monte Carlo generators performed, revealing discrepancies one-photon rates angular distributions former. This disagreement has a negligible effect on e+e−→π+π−(γ)...
Data from high-energy physics (HEP) experiments are collected with significant financial and human effort mostly unique. An inter-experimental study group on HEP data preservation long-term analysis was convened as a panel of the International Committee for Future Accelerators (ICFA). The formed by large collider-based investigated technical organisational aspects preservation. intermediate report released in November 2009 addressing general issues HEP. This paper includes extends report. It...
The process $e^+e^- \to \pi^+\pi^-2\pi^0\gamma$ is investigated by means of the initial-state radiation technique, where a photon emitted from incoming electron or positron. Using $454.3 \rm{fb}^{-1}$ data collected around center-of-mass energy $\sqrt{s} = 10.58 \rm{GeV}$ BaBar experiment at SLAC, approximately 150000 signal events are obtained. corresponding non-radiative cross section measured with relative uncertainty $3.6\%$ in region $1.5 \rm{GeV}$, surpassing all existing measurements...
The decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}_{S}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ has been studied using $430\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events produced at a center-of-mass energy around 10.6 GeV the PEP-II collider and with BABAR detector. mass spectrum of ${K}^{\ensuremath{-}}{K}_{S}$ system measured...
We study the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ in double-tag mode and measure for first time ${\ensuremath{\gamma}}^{\ensuremath{\star}}{\ensuremath{\gamma}}^{\ensuremath{\star}}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}$ transition form factor ${F}_{{\ensuremath{\eta}}^{\ensuremath{'}}}({Q}_{1}^{2},{Q}_{2}^{2})$ momentum-transfer range $2<{Q}_{1}^{2}$, ${Q}_{2}^{2}<60\text{ }\text{...
We study the processes $e^+ e^-\to K^0_S K^0_L\pi^0\gamma$, $K^0_S K^0_L\eta\gamma$, and K^0_L\pi^0\pi^0\gamma$, where photon is radiated from initial state, providing cross section measurements for hadronic final states over a continuum of center-of-mass energies. The results are based on 469~$fb^{-1}$ data collected at or near $\Upsilon(4S)$~ resonance with BaBar detector SLAC. present first K^0_L\pi^0$, K^0_L\eta$, K^0_L\pi^0\pi^0$ sections up to energy 4~GeV, their intermediate...
We study the processes e+e−→π+π−π0π0π0γ and π+π−π0π0ηγ in which an energetic photon is radiated from initial state. The data are collected with BABAR detector at SLAC. About 14 000 4700 events, respectively, selected a sample corresponding to integrated luminosity of 469 fb−1. invariant mass hadronic final state defines effective e+e− center-of-mass energy. From spectra, first precise measurement e+e−→π+π−π0π0π0 cross section ever e+e−→π+π−π0π0η performed. energies range threshold 4.35 GeV....
Using the initial-state radiation method, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}_{S}{K}_{L}$ cross section from 1.98 to 2.54 GeV is measured in a data sample of $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with BABAR detector. The results are used conjunction previous for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$,...
The process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ is studied at a center-of-mass energy near the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance using data sample of $469\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with BABAR detector PEP-II collider. We have performed precise measurement...
Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) has eluded detection so far, and potential dark matter candidate. We report first search for stable, doubly strange in ϒ→SΛ[over ¯]Λ[over ¯] decays based on sample of 90×10^{6}ϒ(2S) 110×10^{6}ϒ(3S) collected by BABAR experiment. No signal is observed, 90% confidence level limits combined ϒ(2S,3S)→SΛ[over branching fraction range (1.2-1.4)×10^{-7} are derived m_{S}<2.05 GeV. These...
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model $\ensuremath{\tau}$ neutrino strength $|{U}_{\ensuremath{\tau}4}{|}^{2}$, corresponding to absolute square extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from BABAR experiment, total integrated luminosity $424\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, are analyzed using kinematic approach makes no assumptions...
We study the processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, ${K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$, and...