A5061081492- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Distributed and Parallel Computing Systems
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- International Science and Diplomacy
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Molecular spectroscopy and chirality
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Graphite, nuclear technology, radiation studies
- Cold Atom Physics and Bose-Einstein Condensates
- Spectroscopy and Quantum Chemical Studies
Argonne National Laboratory
2010-2020
University of California, Los Angeles
2000-2003
UCLA Health
2001
California Institute of Technology
2001
European Organization for Nuclear Research
1973-1994
Stanford Synchrotron Radiation Lightsource
1979-1980
Stanford University
1979-1980
SLAC National Accelerator Laboratory
1979-1980
Fermi National Accelerator Laboratory
1977
Laboratoire de Physique Théorique et Hautes Energies
1977
Amplitudes are derived for the quantum-chromodynamic subprocess $\ensuremath{\gamma}g\ensuremath{\rightarrow}(\frac{J}{\ensuremath{\psi}})g$, with a specific wave function used to represent $\frac{J}{\ensuremath{\psi}}$ as $c\overline{c}$ system. The results obtain normalized total cross section ${\ensuremath{\sigma}}_{\ensuremath{\gamma}}$ inelastic process $\ensuremath{\gamma}N\ensuremath{\rightarrow}(\frac{J}{\ensuremath{\psi}})X$, predictions $z$ and ${p}_{T}$ dependence of...
For massive-lepton pair production in meson-induced reactions, we use quantum chromodynamics perturbation theory to predict that the decay angular distribution rest frame will change from predominantly $1+{cos}^{2}\ensuremath{\theta}$ ${sin}^{2}\ensuremath{\theta}$ as longitudinal-momentum fraction of ${x}_{\mathrm{F}}\ensuremath{\rightarrow}+1$. The two distributions are associated respectively with ${(1\ensuremath{-}x)}^{2}$ and ${Q}^{\ensuremath{-}2}{(1\ensuremath{-}x)}^{0}$ components...
We present measurements of the differential and total cross sections Λ polarization for reaction K−p→ηΛ from threshold to pK−=770MeV/c, with much better precision than previous measurements. Our cross-section data show a remarkable similarity SU(3) flavor-related π−p→ηn results. The at is dominated by formation intermediate Λ(1670)12− state.Received 31 May 2001DOI:https://doi.org/10.1103/PhysRevC.64.055205©2001 American Physical Society
Mass distributions for the $\ensuremath{\pi}\ensuremath{\rho}$ final state in reaction $\ensuremath{\pi}N\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\rho}N$ are calculated from a Regge-pole-exchange model. Compared with results of Drell-Deck-type models, significantly increased mass peaking ${A}_{1}$ region is predicted; widths consistent recent experiments on ${A}_{1}$.
We present a fully differential next-to-next-to-leading order calculation of t-channel single top-quark production and decay at the LHC under narrow-width approximation neglecting cross-talk between incoming protons. focus on fiducial cross sections 13 TeV, finding that QCD corrections can reach level -6%. The scale variations are reduced to percent. Our results be used improve experimental acceptance estimates measurements section electroweak couplings.
We compute the inclusive and differential cross sections for associated production of a top quark along with charged Higgs boson at hadron colliders to next-to-leading order (NLO) in perturbative quantum chromodynamics (QCD) supersymmetric QCD. For small masses we include top-quark pair diagrams subsequent decay into bottom boson. compare NLO obtained parton picture those gluon-initiated process find good agreement. The effects loop contributions are explored. Only corrections Yukawa...
The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, nonuniversal Z' is of particular interest as it naturally predicts in forward region rapidity. To reproduce size asymmetry, couplings to quarks must be large, inevitably leading copious production same-sign pairs energies Large Hadron Collider (LHC). We explore discovery potential for tt and ttj early LHC experiments 7-8 TeV...
Use of a double-Regge-pole-exchange model to describe peripheral three-body final-state processes, especially at near-threshold values the invariant mass pair particles, is described and discussed. The fact stressed that provides an understanding entire reaction, yielding distributions in all kinematical variables. As example, results are presented from detailed comparison predicted with data $\mathrm{pp}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\Delta}}^{++}$...
We present a comprehensive phenomenological examination of the Veneziano ansatz for pion-nucleon and kaon-nucleon processes. Using invariant amplitudes constructed as sums beta-function terms, we attempt to fit simultaneously all relevant high- low-energy scattering data well elastic widths baryon resonances. discuss useful technique ensuring that theoretical will possess observed spin-parity structure physical spectrum states. Our main conclusions are following: (a) Sizable subsidiary terms...
The weak boson fusion process for neutral Higgs production is investigated with particular attention to the accuracy which coupling bosons can be determined at CERN Large Hadron Collider energies in final states that contain a plus least two jets. Using fully differential perturbative matrix elements signal and QCD background processes, we generate events produced along jets carry large transverse momentum. effectiveness of different prescriptions enhance signal-to ratio studied, expected...
A detailed analysis of $W\ensuremath{\gamma}$ production and radiative $W$ decays at the Fermilab Tevatron is presented for general $\mathrm{WW}\ensuremath{\gamma}$ couplings. Possibilities to test gauge structure vertex are explored. At Tevatron, an integrated luminosity 100 ${\mathrm{pb}}^{\ensuremath{-}1}$, can be measured with 25-40% accuracy in production. The limits which obtained from found significantly weaker.
Experimental distributions in all kinematic variables for the reaction $\mathrm{pp}\ensuremath{\rightarrow}\mathrm{pn}{\ensuremath{\pi}}^{+}$ at 28.5 GeV/c are consistent with predictions of a double-Regge-pole model employing Pomeranchuk and pion exchanges required to couple conspiracy fashion $\mathrm{np}$. The 1400-MeV $\ensuremath{\pi}N$ enhancement seen these data is well fitted.
A bstract We present a detailed phenomenological study of the next-to-next-to-leading order (NNLO) QCD corrections for t -channel single top (anti-)quark production and its semi-leptonic decay at CERN Large Hadron Collider (LHC). find NNLO total inclusive rates LHC with different center mass energies are generally smaller than NLO corrections, indicative improved convergence. However, they can be large differential distributions, reaching level 10% or more in certain regions transverse...
We present a fully differential next-to-next-to-leading order calculation of charm quark production in charged-current deep-inelastic scattering, with full charm-quark mass dependence. The corrections perturbative quantum chromodynamics are found to be comparable size the next-to-leading certain kinematic regions. compare our predictions data on dimuon (anti-)neutrino scattering from heavy nucleus. Our results can used improve extraction parton distribution function strange nucleon.
Our calculation of the total cross section for inclusive production $t\overline{t}$ pairs in hadron collisions is presented. The principal ingredient resummation universal leading-logarithm effects gluon radiation to all orders quantum chromodynamics coupling strength, restricted region phase space that demonstrably perturbative. We derive perturbative regime resummed series, starting from principal-value approach, and we isolate domain both moment and, upon inversion corresponding Mellin...
A long-standing discrepancy between the bottom-quark production cross section and predictions of perturbative quantum chromodynamics is addressed. We show that pair light gluinos, mass 12 to 16 GeV, with two-body decays into bottom quarks squarks, yields a rate in agreement hadron collider data. examine constraints on this scenario from low-energy data make may be tested at next run Fermilab Tevatron collider.