A5042152224- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Ionosphere and magnetosphere dynamics
- Nuclear physics research studies
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Metamaterials and Metasurfaces Applications
- Geomagnetism and Paleomagnetism Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Advanced X-ray and CT Imaging
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Photorefractive and Nonlinear Optics
- Scientific Research and Discoveries
- Photonic Crystals and Applications
- Enzyme Structure and Function
- Topological Materials and Phenomena
- Advanced NMR Techniques and Applications
- Optical Coatings and Gratings
National Taiwan University
2021
National Central University
1991-1996
National Tsing Hua University
1995-1996
Institute of Physics, Academia Sinica
1995
Cornell University
1970-1995
University of Arizona
1969-1989
University of Massachusetts Amherst
1985-1988
Virginia Tech
1986
University of Notre Dame
1984
Fermi National Accelerator Laboratory
1984
The flavor and spin symmetry of the heavy quarks spontaneously broken approximate ${\mathrm{SU}(3)}_{L}\ifmmode\times\else\texttimes\fi{}{\mathrm{SU}(3)}_{R}$ chiral light are exploited to formulate a theory describing low-energy interactions mesons ($Q\overline{q}$ bound states) baryons (${\mathrm{Qq}}_{1}{q}_{2}$ with Goldstone bosons $\ensuremath{\pi}$, $K$, $\ensuremath{\eta}$. contains only three parameters independent number heavy-quark species involved. They can be determined by...
We compute the one-loop corrections to Wess-Zumino Lagrangean governing ${\ensuremath{\pi}}^{0}$, ${\ensuremath{\eta}}_{8}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$. The SU(3) relation between two decay rates receives modifications of order ${m}_{K}^{2}\mathrm{ln}{m}_{K}^{2}$, as does Gell-Mann-Okubo mass formula. A consistent picture $\ensuremath{\eta}\ensuremath{-}{\ensuremath{\eta}}^{\ensuremath{'}}$ mixing emerges from both two-photon widths and matrix, however with...
The radiative decays of heavy mesons and baryons are studied in a formalism which incorporates both heavy-quark symmetry chiral symmetry. Lagrangians for the electromagnetic interactions hadrons consist two pieces: one from gauging electromagnetically strong-interaction Lagrangian, other anomalous magnetic moment mesons. Because spin symmetry, latter contains only independent coupling constant meson sector baryon sector. These constants depend on light quarks can be calculated...
Two-photon production of a neutral-pion pair is uniquely predicted near threshold by the theory chiral symmetry. The prediction vanishes at tree level and nonzero only one-loop order, yielding finite result without any unknown counterterms. In this paper we calculate cross section for both on-shell off-shell photons, as cases can be studied ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ storage rings. This reaction most accessible process which directly probes loop structure chiral-SU(2)
Motivated by the observation of decay B\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}K${\mathrm{\ifmmode\bar\else\textasciimacron\fi{}}}^{\mathrm{*}}$\ensuremath{\gamma} CLEO Collaboration, we have systematically analyzed two-body weak radiative decays bottom and charmed hadrons. There exist two types decays: One proceeds through short-distance b\ensuremath{\rightarrow}s\ensuremath{\gamma} transition other occurs W exchange accompanied a photon emission. Effective Lagrangians...
As one of the latest research hotspots in field artificial intelligence, AI-generated content (AIGC) can create virtual teaching scenarios, such as those involving educational digital humans, through creation. This integration AI and education is a product that will profoundly change form online learning experience. Currently, most courses for humans still rely on traditional models face many problems practice. Based an overview AIGC technology its application micro-course production, this...
In previous publications we have analyzed the strong and electromagnetic decays of heavy mesons baryons in a formalism which incorporates heavy-quark chiral symmetries. There are two possible symmetry-breaking effects on dynamics hadrons: finite-mass from light quarks $\frac{1}{{m}_{Q}}$ corrections quarks. present paper, chiral-symmetry-breaking studied applications to various radiative hadrons illustrated. SU(3) violations induced by loops charmed compared with those predicted constituent...
The heavy-flavor-conserving nonleptonic weak decays of heavy baryons are studied in a formalism that incorporates both heavy-quark symmetry and chiral symmetry. phenomenological $\ensuremath{\Delta}S=1$ Lagrangian for these transitions contains two independent coupling constants describe the between flavor-SU(3) antitriplet baryons, sextet baryons. In MIT bag model diquark model, only antitriplets allowed. calculated models. result is applied to specific such as...
We study the process ${K}_{L}$\ensuremath{\rightarrow}${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}, looking for new information on CP violation. find that violation in this is dominated by inner-bremsstrahlung contribution which gives no different from what known ${K}_{L}$\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}. Any direct emission appears to be too small observed. also direct-emission term long-distance contributions...
In earlier publications we have analyzed the strong and radiative decays of heavy hadrons in a formalism which incorporates both heavy-quark chiral symmetries. particular, derived heavy-hadron Lagrangian whose coupling constants are related by flavor-spin symmetry arising from QCD with infinitely massive quarks. this paper, re-examine structure above including effects $1/m_Q$ corrections quark effective theory. The relations among constants, originally limit, modified breaking interactions...
Our calculation shows that negative refractive index (NRI), which was known to exist only in metamaterials the past, can be found Dirac semimetals (DSM). Electrons DSM have zero effective mass and hence system carries no nominal energy scale. Therefore, unlike those of ordinary materials, electromagnetic responses electrons will not overwhelmed by physical effects related electron mass. NRI is induced combination quantum effect vacuum polarization its finite temperature correction,...
We study in detail the prediction for semileptonic decays $\overline{B}\ensuremath{\rightarrow}D({D}^{*})\ensuremath{\pi}\ensuremath{\ell}\overline{\ensuremath{\nu}}$ by heavy quark and chiral symmetry. The branching ratio $\overline{B}\ensuremath{\rightarrow}D\ensuremath{\pi}\ensuremath{\ell}\overline{\ensuremath{\nu}}$ is quite significant, as big (0.5-1)%. $\overline{B}\ensuremath{\rightarrow}{D}^{*}\ensuremath{\pi}\ensuremath{\ell}\overline{\ensuremath{\nu}}$ only of order...
We study both CP-conserving and -violating contributions to the decay ${\mathit{K}}_{\mathit{L}}$\ensuremath{\rightarrow}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\nu}\ensuremath{\nu}\ifmmode\bar\else\textasciimacron\fi{}. find that branching ratio is dominated by part. In standard CKM model, we estimate for ${\mathit{m}}_{\mathit{t}}$\ensuremath{\sim}174 GeV, due (-violating) can be as large...
We calculate the long distance contributions to $K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}, \ensuremath{\pi}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}, \mathrm{and} \ensuremath{\pi}\ensuremath{\pi}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ modes within framework of chiral perturbation theory. find that these decay rates $K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and...
We examine the general lagrangian for baryon chiral perturbation theory with SU(3) flavor symmetry, up to next-to-leading order. consider both strong and weak interaction. The inverse of mass is treated as an additional small expansion parameter, heavy fermion effective field techniques are employed provide a consistent scheme. A detailed account given on restrictions imposed by various symmetries. Corrections due finite also discussed.
For the reaction ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$N\ensuremath{\rightarrow}${V}^{0}$X, where ${V}^{0}$ is a ${K}_{s}^{0}$, \ensuremath{\Lambda}, and \ensuremath{\Lambda}\ifmmode\bar\else\textasciimacron\fi{} X are charged particles, we measured transverse- longitudinal-momentum distributions, inclusive cross sections for ${K}^{\mathrm{*}\ifmmode\pm\else\textpm\fi{}}$(892), ${\ensuremath{\Sigma}}^{\ifmmode\pm\else\textpm\fi{}}$(1385),...
Baryon production and subsequent decay into ${K}_{s}^{0}{\ensuremath{\Lambda}}^{0}$, ${\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}_{s}^{0}{\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$ ${\ensuremath{\Lambda}}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ final states is studied. Evidence for the $N(1710)$, $\ensuremath{\Sigma}(1385)$, $\ensuremath{\Sigma}(1620)$, $\ensuremath{\Sigma}(1690)$,...
The production of φ-meson pairs has been observed in 400-GeV/c proton-nucleon interactions at the Fermilab multiparticle spectrometer inclusive reaction pN→φφ+X, where each φ decays to a K+K− pair. A fast (200 nsec) high-level processor was used selectively trigger on events containing two oppositely charged kaons having low invariant masses. experimental apparatus and are described. cross section for φφ an upper limit ηc presented.Received 30 September...