A5070030327- 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
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Advanced Data Storage Technologies
- Advanced NMR Techniques and Applications
- Distributed and Parallel Computing Systems
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactive Decay and Measurement Techniques
Centre National de la Recherche Scientifique
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
1998-2024
Université Paris-Saclay
2004-2024
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2024
Université Paris-Sud
2012-2022
Université Paris Cité
2000-2022
GANIL
1999-2019
Stanford Synchrotron Radiation Lightsource
1969-2018
Stanford University
1969-2018
SLAC National Accelerator Laboratory
1969-2018
We review the present status of Standard Model calculation anomalous magnetic moment muon. This is performed in a perturbative expansion fine-structure constant $\alpha$ and broken down into pure QED, electroweak, hadronic contributions. The QED contribution by far largest has been evaluated up to including $\mathcal{O}(\alpha^5)$ with negligible numerical uncertainty. electroweak suppressed $(m_\mu/M_W)^2$ only shows at level seventh significant digit. It two loops known better than one...
We reevaluate the hadronic contributions to muon magnetic anomaly, and running of electromagnetic coupling constant at Z-boson mass. include new pi+pi- cross-section data from KLOE, all available multi-hadron BABAR, a reestimation missing low-energy using results on cross sections process dynamics reevaluation experimental software package HVPTools, together with reanalysis inter-experiment inter-channel correlations, continuum perturbative QCD four loops. These improvements lead decrease in...
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...
Hadronic $\ensuremath{\tau}$ decays provide a clean laboratory for the precise study of quantum chromodynamics (QCD). Observables based on spectral functions hadronic can be related to QCD quark-level calculations determine fundamental quantities like strong-coupling constant, parameters chiral Lagrangian $\ensuremath{\mid}{V}_{us}\ensuremath{\mid}$, mass strange quark, and simultaneously test concept quark-hadron duality. Using best available measurements revisited analysis theoretical...
An update of the ALEPH non-strange spectral functions from hadronic $$\tau $$ decays is presented. Compared to 2005 publication, main improvement related use a new method unfold measured mass spectra detector effects. This procedure also corrects previous problem in correlations between unfolded bins. Results QCD studies and for evaluation vacuum polarisation contribution anomalous muon magnetic moment are derived using functions. They found agreement with published results based on set
Using recently published, high-precision π + − cross section data by the BABAR experiment from analysis of e events with high-energy photon radiation in initial state, we reevaluate lowest order hadronic contribution $(a_{\mu}^{\mathrm{had},\mathrm{LO}})$ to anomalous magnetic moment muon. We employ newly developed software featuring improved interpolation and averaging, more accurate error propagation systematic validation. With new data, discrepancy between −- τ-based results for dominant...
We reevaluate the hadronic vacuum polarisation contributions to muon magnetic anomaly and running of electromagnetic coupling constant at $Z$-boson mass. include newest $e^+e^- \to$ hadrons cross-section data together with a phenomenological fit threshold region in evaluation dispersion integrals. The precision individual datasets cannot be fully exploited due discrepancies that lead additional systematic uncertainty particular between BABAR KLOE dominant $π^+π^-$ channel. For $(g-2)/2$, we...
Abstract The situation of the experimental data used in dispersive evaluation hadronic vacuum polarization contribution to anomalous magnetic moment muon is assessed view two recent measurements: $$e^+e^- \rightarrow \pi ^+\pi ^-$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>-</mml:mo> <mml:mo>→</mml:mo> <mml:mi>π</mml:mi> </mml:mrow> </mml:math> cross sections $$\rho $$ <mml:mi>ρ</mml:mi> resonance...
The precision with which hadronic vacuum polarization (HVP) is obtained determines how accurately important observables, such as the muon anomalous magnetic moment <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>a</a:mi></a:mrow><a:mrow><a:mi>μ</a:mi></a:mrow></a:msub></a:mrow></a:math> or low-energy running of electromagnetic coupling <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>α</c:mi></c:math>, are...
We present a partial-wave analysis of the ${K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ system in ${K}^{\ifmmode\pm\else\textpm\fi{}}p\ensuremath{\rightarrow}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}p$ at 13 GeV. Evidence is given for existence two ${J}^{P}={1}^{+}$ mesons: one \ensuremath{\sim} 1300 MeV ($\ensuremath{\Gamma}\ensuremath{\sim}200$ MeV) coupling principally to $\ensuremath{\rho}K$...
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...