M. E. Sevior
A5014837331- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Quantum Computing Algorithms and Architecture
- Scientific Computing and Data Management
- Quantum Information and Cryptography
- Nuclear Physics and Applications
- Advanced Data Storage Technologies
- advanced mathematical theories
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
The University of Melbourne
2016-2025
Chinese Academy of Sciences
2013-2024
Institute of High Energy Physics
2013-2024
La Trobe University
2023
University of the Basque Country
2013-2022
Campbell Collaboration
2012-2022
Chonnam National University
2018-2022
University of Bonn
1987-2022
Duke University
2019-2022
National Taiwan University
2022
The Collins effect connects transverse quark spin with a measurable azimuthal asymmetry in the yield of hadronic fragments around quark's momentum vector. Using two different reconstruction methods we measure statistically significant asymmetries for charged pion pairs ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies 10.52 GeV and 10.58 GeV, which can be attributed to fragmentation primordial quarks components. measurement was performed using data set $547\text{ }\text{...
We report the results of a search for charmonium-like state produced in process gamma --> omega J/psi 3.9-4.2 GeV/c^2 mass region. observe significant enhancement, which is well-described by resonant shape with M = (3915 +/- 3 2) MeV/c^2 and total width Gamma (17 10 3) MeV. This enhancement may be related to one or more three states so far reported 3.90-3.95
Machine learning (ML) methods such as artificial neural networks are rapidly becoming ubiquitous in modern science, technology and industry. Despite their accuracy sophistication, can be easily fooled by carefully designed malicious inputs known adversarial attacks. While vulnerabilities remain a serious challenge for classical networks, the extent of existence is not fully understood quantum ML setting. In this work, we benchmark robustness variational classifiers (QVC), at scale performing...
Exploiting the power of quantum computation to realize superior machine learning algorithms has been a major research focus recent years, but prospects (QML) remain dampened by considerable technical challenges. A particularly significant issue is that generic QML models suffer from so-called barren plateaus in their training landscapes—large regions where cost function gradients vanish exponentially number qubits employed, rendering large effectively untrainable. leading strategy for...
Using 605 fb−1 of data collected at the Υ(4S) resonance we present a measurement inclusive radiative B-meson decay channel, B→Xsγ. For lower photon energy thresholds 1.7, 1.8, 1.9, and 2.0 GeV, as defined in rest frame B meson, measure partial branching fraction mean variance spectrum. At 1.7 GeV threshold obtain BF(B→Xsγ)=(3.45±0.15±0.40)×10−4, where errors are statistical systematic.Received 8 July 2009DOI:https://doi.org/10.1103/PhysRevLett.103.241801©2009 American Physical Society
Abstract Machine learning is among the most widely anticipated use cases for near-term quantum computers, however there remain significant theoretical and implementation challenges impeding its scale up. In particular, an emerging body of work which suggests that generic, data agnostic machine (QML) architectures may suffer from severe trainability issues, with gradient typical variational parameters vanishing exponentially in number qubits. Additionally, high expressibility QML models can...
Quantum machine learning (QML) is emerging as an application of quantum computing with the potential to deliver advantage, but its realization for practical applications remains impeded by challenges. Among these, a key barrier computationally expensive task encoding classical data into state, which could erase any prospective speedups over algorithms. In this study, we implement methods efficient preparation states representing encoded image using variational, genetic, and matrix product...
Quantum crosstalk which stems from unwanted interference of quantum operations with nearby qubits is a major source noise or errors in processor. In the context shared computing, it challenging to mitigate effect between computations being simultaneously run by multiple users since exact spatio-temporal gate distributions are not apparent due privacy concerns. It therefore important develop techniques for accurate detection and mitigation enable high-fidelity computing. Assuming prior...
Measurements of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$p elastic differential cross sections have been made at seven incident pion energies from 66.8 to 138.8 MeV. These measurements statistical accuracy 1.5--3.3?for ${\ensuremath{\pi}}^{+}$ and 2.7--19.0?for ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$. The absolute normalization uncertainties are 1.2--2.5?for 1.2--3.2?for Extensive tests were ensure that systematic errors properly evaluated.
We present a high-statistics measurement of differential cross sections and the total section for process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ in kinematic range $0.6\text{ }\text{ }\mathrm{GeV}\ensuremath{\le}W\ensuremath{\le}4.0\text{ }\mathrm{GeV}$ $|\mathrm{cos}{\ensuremath{\theta}}^{*}|\ensuremath{\le}0.8$, where $W$ ${\ensuremath{\theta}}^{*}$ are energy pion scattering angle, respectively,...
We present an analysis of charm quark fragmentation at 10.6 GeV, based on a data sample $103\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the Belle detector KEKB accelerator. consider into main charmed hadron ground states, namely ${D}^{0},{D}^{+},{D}_{s}^{+}$ and ${\ensuremath{\Lambda}}_{c}^{+}$, as well excited states ${D}^{*0}$ ${D}^{*+}$. The functions are important to measure they describe processes low energy scale, where calculations in perturbation theory lead large...
The differential cross section for the process $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{0}$ has been measured in kinematic range $0.84\text{ }\text{ }\mathrm{GeV}<W<4.0\text{ }\mathrm{GeV}$, $|\mathrm{cos}{\ensuremath{\theta}}^{*}|<0.8$, where $W$ and ${\ensuremath{\theta}}^{*}$ are energy ${\ensuremath{\pi}}^{0}$ (or $\ensuremath{\eta}$) scattering angle, respectively, $\ensuremath{\gamma}\ensuremath{\gamma}$ center-of-mass system....
We present a new measurement of the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}c\overline{c}$ cross section where $c\overline{c}$ pair can fragment either into charmed hadrons or charmonium state. In former case $J/\ensuremath{\psi}$ and hadron are reconstructed, while latter process is measured using recoil mass technique, which allows identification two-body final states without reconstruction one charmonia. The...
This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{cb}|$ from decay ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}{\ensuremath{\ell}}^{+}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ using $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ Belle data collected near $\ensuremath{\Upsilon}(4S)$ resonance. We simultaneously measure product form factor normalization $\mathcal{F}(1)$ and as well three parameters ${\ensuremath{\rho}}^{2}$, ${R}_{1}(1)$...
The cross section for e^+e^- \to \eta J/\psi between \sqrt{s}=3.8 GeV/c^2 and 5.3 is measured via initial state radiation using 980 fb^{-1} of data on around the \Upsilon(nS)(n=1,2,3,4,5) resonances collected with Belle detector at KEKB. Two resonant structures \psi(4040) \psi(4160) are observed in invariant mass distribution. Fitting spectrum coherent sum two Breit-Wigner functions, one obtains BR(\psi(4040)\to\eta J/\psi)\cdot\Gamma_{ee}^{\psi(4040)} = (4.8\pm0.9\pm1.4) eV...
Abstract Quantum computers have the potential to speed up certain computational tasks. A possibility this opens within field of machine learning is use quantum techniques that may be inefficient simulate classically but could provide superior performance in some Machine algorithms are ubiquitous particle physics and as advances made technology there a similar adoption these techniques. In work support vector (QSVM) implemented for signal-background classification. We investigate effect...
The ${}^{2}\mathrm{H}{,}^{12}\mathrm{C}{,}^{40}\mathrm{Ca}{,}^{208}\mathrm{Pb}({\ensuremath{\pi}}^{+},{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})$ reactions have been studied at ${T}_{{\ensuremath{\pi}}^{+}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}282.7\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$, and the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ invariant mass distributions...
A model field theory, in which the interaction between quarks is mediated by dressed vector boson exchange, used to analyze pionic sector of QCD. It shown that this model, incorporates dynamical chiral symmetry breaking, asymptotic freedom, and quark confinement, allows one calculate ${f}_{\ensuremath{\pi}}$, ${m}_{\ensuremath{\pi}}$, ${r}_{\ensuremath{\pi}}$, partial wave amplitudes $\ensuremath{\pi}\ensuremath{-}\ensuremath{\pi}$ scattering obtain good agreement with experimental data,...
We present a time-dependent Dalitz plot measurement of CP violation parameters in B0 --> Ks Pi+ Pi- decays. These results are obtained from large data sample that contains 657 million BBbar pairs collected at the Y(4S) resonance with Belle detector KEKB asymmetric-energy e+e- collider. For parameters, we obtain two consistent solutions describe well. The first these may be preferred by external information other measurements. There is no evidence for direct rho0(770) Ks, f0(980) and K*+(892)...
We search for the flavor-changing neutral current decays D0\to mu+mu- and e+e-, lepton-flavor violating e\pm mu\mp using 660 fb^-1 of data collected with Belle detector at KEKB asymmetric-energy e+e- collider. find no evidence any these decays. obtain significantly improved upper limits on branching fractions: B(D0\to mu+mu-)<1.4x10-7, e+e-)<7.9x10-8, e+mu-)+B(D0\to mu+e-)<2.6x10-7 90% confidence level.