D. J. Payne
A5034895214- 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
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Nuclear physics research studies
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Machine Learning in Bioinformatics
- Computational Drug Discovery Methods
- Advanced Data Storage Technologies
- Radioactive Decay and Measurement Techniques
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Noncommutative and Quantum Gravity Theories
University of Liverpool
2014-2024
Imperial College London
2019
Laboratoire d’Annecy de Physique des Particules
2003-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2018
University of the Basque Country
2018
Institut National de Physique Nucléaire et de Physique des Particules
2018
Centre National de la Recherche Scientifique
2018
Universitat de Barcelona
2018
Institute of Particle Physics
2013
University of Alberta
2013
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...
The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and Super-Kamiokande detector. Special emphasis is placed on measuring mixing angle theta_13 by observing electron appearance via sub-dominant to oscillation, searching for CP violation in lepton sector. includes a sophisticated, off-axis, near detector, ND280, situated 280 m downstream production target order measure properties understand better interactions at energy scale below...
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)...
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...
A new mechanism has been proposed to simultaneously explain the presence of dark matter and matter-antimatter asymmetry in universe. This scenario predicts exotic $B$ meson decays into a baryon sector anti-baryon ($\psi_D$) with branching fractions accessible at factories. We present search for $B \rightarrow \Lambda \psi_D$ using data collected by $BABAR$ experiment SLAC. reaction is identified fully reconstructing accompanying requiring single $\Lambda$ remaining particles. No significant...
We perform the first measurement on ${D}^{0}\ensuremath{-}{\overline{D}}^{0}$ mixing parameters using a time-dependent amplitude analysis of decay ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$. The data were recorded with BABAR detector at center-of-mass energies and near $\ensuremath{\Upsilon}(4S)$ resonance, correspond to an integrated luminosity approximately $468.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. neutral...
Oscillation probability calculations are becoming increasingly CPU intensive in modern neutrino oscillation analyses. The independency of reweighting individual events a Monte Carlo sample lends itself to parallel implementation on Graphics Processing Unit. library "Prob3++" was ported the GPU using CUDA C API, allowing for large scale parallelized probabilities through matter constant density, decreasing execution time by factor 75, when compared performance single CPU.
Using a sample of (470.9 +- 2.8) x 10^6 BB-bar pairs, we measure the decay branching fraction B(B^0 -> D^*- pi^+ pi^- pi^+) = (7.26 0.11 0.31) 10^-3, where first uncertainty is statistical and second systematic. Our measurement will be helpful in studies lepton universality by measuring tau^+ nu_tau) using nu-bar_tau decays, normalized to pi^+.
A new dark sector antibaryon, denoted ψD, could be produced in decays of B mesons. This Letter presents a search for B+→ψD+p (and the charge conjugate) e+e− annihilations at 10.58 GeV, using data collected BABAR experiment. Data corresponding to an integrated luminosity 398 fb−1 are analyzed. No evidence signal is observed. Branching fraction upper limits range from 10−7–10−5 obtained 90% confidence level masses 1.0<mψD<4.3 GeV/c2. The result also reinterpreted provide first on...
The TITUS, Tokai Intermediate Tank for Unoscillated Spectrum, detector, is a proposed Gd-doped Water Cherenkov tank with magnetised muon range detector downstream. It located at J-PARC about 2 km from the neutrino target and it as potential near Hyper-Kamiokande experiment. Assuming beam power of 1.3 MW 27.05 x 10^{21} protons-on-target sensitivity to CP mixing parameters achieved by TITUS presented. Also, cross sections Standard Model parameter determination, supernova dark matter are shown.
Using the entire <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="normal">ϒ</a:mi><a:mo stretchy="false">(</a:mo><a:mn>4</a:mn><a:mi>S</a:mi><a:mo stretchy="false">)</a:mo></a:math> dataset, first two-dimensional unbinned angular analysis of semileptonic decay <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mover accent="true"><f:mi>B</f:mi><f:mo stretchy="false">¯</f:mo></f:mover><f:mo...
We present a new technique, ``tau polarimetry,'' for measuring the longitudinal beam polarization in an ${e}^{+}{e}^{\ensuremath{-}}$ collider through analysis of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ events. By exploiting sensitivity $\ensuremath{\tau}$ decay kinematics to beams, we demonstrate that can be measured with 3 per mil systematic uncertainty at interaction point using technique is independent spin and...
We measure the mass difference, Δm_{+}, between D^{*}(2010)^{+} and D^{+} using decay chain D^{*}(2010)^{+}→D^{+}π^{0} with D^{+}→K^{-}π^{+}π^{+}. The data were recorded BABAR detector at center-of-mass energies near ϒ(4S) resonance, correspond to an integrated luminosity of approximately 468 fb^{-1}. Δm_{+}=(140 601.0±6.8[stat]±12.9[syst]) keV. combine this result a previous measurement Δm_{0}≡m(D^{*}(2010)^{+})-m(D^{0}) obtain Δm_{D}=m(D^{+})-m(D^{0})=(4824.9±6.8[stat]±12.9[syst]) These...
Using the entire BaBar $Υ(4S)$ data set, first two-dimensional unbinned angular analysis of semileptonic decay $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ is performed, employing hadronic reconstruction tag-side $B$ meson from $Υ(4S)\to B\overline{B}$. Here, $\ell$ denotes light charged leptons $e$ and $μ$. A novel data-driven signal-background separation procedure with minimal dependence on simulation developed. This preserves all multi-dimensional correlations present in data. The...