A5059102698- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Dark Matter and Cosmic Phenomena
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Particle accelerators and beam dynamics
- Hydraulic Fracturing and Reservoir Analysis
- Advanced Semiconductor Detectors and Materials
- Spectroscopy and Laser Applications
- Crystallography and Radiation Phenomena
- Gamma-ray bursts and supernovae
- Nuclear physics research studies
- Atomic and Molecular Physics
- Radiomics and Machine Learning in Medical Imaging
- Photocathodes and Microchannel Plates
- Quantum, superfluid, helium dynamics
Institute for High Energy Physics
2009-2024
University of Bern
2023
Albert Einstein College of Medicine
2023
Eötvös Loránd University
2023
Boston University
2023
Duke University
2023
Universidad Autónoma de Madrid
2023
University of California, Irvine
2023
Kurchatov Institute
2019-2023
Institute for Nuclear Research
2019-2023
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance disappearance channels. This result comes from an exposure $14.9(16.4)\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target in (antineutrino) mode. Significant improvements have been made to the interaction model far detector reconstruction. An extensive set simulated data studies also performed quantify effect uncertainties oscillation parameter sensitivity. performs...
The goal of the DIRAC experiment at CERN (PS212) is to measure $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield precision 5% on value $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based part collected data we present first result lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss major systematic errors. This corresponds $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.
This paper reports the first simultaneous measurement of double differential muon neutrino charged-current cross section on oxygen and carbon without pions in final state as a function outgoing kinematics, made at ND280 off-axis near detector T2K experiment. The ratio sections is also provided to help validate various models' ability extrapolate between nuclear targets, required oscillation analyses. data are taken using beam with an energy spectrum peaked 0.6 GeV. extracted compared...
The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and significantly improved the precision on its lifetime determination. From sample 21227 atomic pairs, 4% measurement S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ been attained, providing an important test Chiral Perturbation Theory.
This paper presents the first combined measurement of double-differential muon neutrino and antineutrino charged-current cross sections with no pions in final state on hydrocarbon at off-axis near detector T2K experiment. The data analyzed this work comprise $5.8\ifmmode\times\else\texttimes\fi{}{10}^{20}$ $6.3\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target mode respectively, a beam energy peak 0.6 GeV. Using two measured sections, sum, difference, asymmetry were calculated aim...
Muon neutrino and antineutrino disappearance probabilities are identical in the standard three-flavor oscillation framework, but $CPT$ violation nonstandard interactions can violate this symmetry. In work we report measurements of ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{23}$ $\mathrm{\ensuremath{\Delta}}{m}_{32}^{2}$ independently for neutrinos antineutrinos. The aforementioned symmetry would manifest as an inconsistency parameters. analysis discussed here uses a total...
A bstract The electron (anti-)neutrino component of the T2K neutrino beam constitutes largest background in measurement appearance at far detector. scattering is measured directly with off-axis near detector, ND280. selection events plastic scintillator target from both and anti-neutrino mode beams discussed this paper. flux integrated single differential charged-current inclusive cross-sections, dσ/dp dσ/d cos( θ ), total cross-sections a limited phase-space momentum angle ( p > 300...
The results of a search for hydrogen-like atoms consisting $\pi^{\mp}K^{\pm}$ mesons are presented. Evidence $\pi K$ atom production by 24 GeV/c protons from CERN PS interacting with nickel target has been seen in terms characteristic pairs their breakup the same ($178 \pm 49$) and Coulomb final state interaction ($653 42$). Using these analysis yields first value lifetime $\tau=(2.5_{-1.8}^{+3.0})$ fs model-independent measurement S-wave isospin-odd scattering length...
Neutrino- and antineutrino-oxygen neutral-current quasielasticlike interactions are measured at Super-Kamiokande using nuclear deexcitation $\ensuremath{\gamma}$ rays to identify signal-like in data from a $14.94(16.35)\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target exposure of the T2K neutrino (antineutrino) beam. The flux-averaged cross sections on oxygen nuclei...
Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced beam, using additional neutrino beam operation to constrain parameters of Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. observes 15 candidate electron events with a background expectation 9.3 events. Including information from kinematic distribution observed events, hypothesis no disfavored significance $2.40\ensuremath{\sigma}$ and discrepancy between data PMNS predictions found. A...
This paper reports the first T2K measurement of transverse kinematic imbalance in single-π+ production channel neutrino interactions. We measure differential cross sections muon-neutrino charged-current interaction on hydrocarbon with a single π+ and at least one proton final state, ND280 off axis near detector experiment. The extracted are compared to predictions from different neutrino-nucleus event generators. Overall, results show preference for models that have more realistic treatment...
We report the measurements of single and double differential cross section muon neutrino charged-current interactions on carbon with a positively charged pion in final state at T2K off-axis near detector using $5.56\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target. The analysis uses data control samples for background subtraction signal, defined as negatively exiting from target nucleus, is extracted an unfolding method. model-dependent section, integrated over beam spectrum...
The observation of hydrogenlike πK atoms, consisting π^{-}K^{+} or π^{+}K^{-} mesons, is presented. atoms are produced by 24 GeV/c protons from the CERN PS accelerator, interacting with platinum nickel foil targets. breakup (ionization) in same targets yields characteristic pairs, called "atomic pairs," small relative momenta Q pair center-of-mass system. upgraded DIRAC experiment observed 349±62 such atomic corresponding to a signal 5.6 standard deviations. This first statistically...
In this document, technical details of the upgrade plan J-PARC neutrino beamline for extension T2K experiment are described. has proposed to accumulate data corresponding $2\times{}10^{22}$ protons-on-target in next decade, aiming at an initial observation CP violation with $3\sigma$ or higher significance case maximal violation. Methods increase beam intensity, which necessary achieve increase,
The goal of the DIRAC experiment at CERN is to measure with high precision lifetime π + -atom (A 2π ), which order 3×10 -15 s, and thus determine s-wave ππ-scattering lengths difference |a 0 -a 2 |.A atoms are detected through characteristic features -pairs from atom break-up (ionization) in target.We report on a first statistics atomic data sample obtained p Ni interactions 24 GeV/c proton momentum present methods separate signal background.
We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with DIRAC experiment at CERN-PS. The $\pi K$-atoms are produced by 24 GeV/c proton beam in a thin Pt-target and $\pi^\pm$ $K^\mp$-mesons from atom dissociation analyzed two-arm magnetic spectrometer. observed enhancement low relative momentum corresponds to production 173 $\pm$ 54 K$-atoms. mean life is related s-wave K$-scattering lengths, measurement which goal experiment. From...
After observing and investigating the double-exotic (a atom is a bound system, in which both oppositely charged components are unstable particles like μ,π,K,…) π+π− with ground state lifetime τ of about 3×10−15 s, upgraded DIRAC experiment at CERN PS accelerator observes for first time long-lived states same lifetimes 10−11 s more. The number characteristic pion pairs resulting from breakup (ionisation) atoms amounts to 436±61, corresponding signal-to-error ratio better than 7 standard...
This paper reports the first differential measurement of charged-current ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ interaction cross section on water with no pions in final state. The unfolded flux-averaged using T2K off-axis near detector is given double-differential bins ${\ensuremath{\mu}}^{+}$ momentum and angle. integrated a restricted phase space $\ensuremath{\sigma}=(1.11\ifmmode\pm\else\textpm\fi{}0.18)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}38}\text{ }\text{...
Abstract The T2K experiment widely uses plastic scintillator as a target for neutrino interactions and an active medium the measurement of charged particles produced in at its near detector complex. Over 10 years operation measured light yield recorded by based subsystems has been observed to degrade 0.9–2.2% per year. Extrapolation degradation rate through 2040 indicates should remain above lower threshold used current reconstruction algorithms all subsystems. This will allow detectors...