C. H. Cheng
A5115599244- 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
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Ultrasound Imaging and Elastography
- Shape Memory Alloy Transformations
- Medical Imaging Techniques and Applications
- Quantum and electron transport phenomena
- Ultrasonics and Acoustic Wave Propagation
- Near-Field Optical Microscopy
- Magnetic and transport properties of perovskites and related materials
- Black Holes and Theoretical Physics
- Semiconductor Lasers and Optical Devices
- Photoacoustic and Ultrasonic Imaging
- GaN-based semiconductor devices and materials
- Astrophysics and Cosmic Phenomena
- Advanced Fiber Laser Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
Chongqing University
2023-2024
New Technology (Israel)
2024
Kyushu University
2023-2024
Fujian Medical University
2024
Union Hospital
2024
Fukuoka Institute of Technology
2021-2023
Fudan University
2020-2023
Nanjing University of Science and Technology
2022
Institute of Physics, Academia Sinica
2016-2022
Louisiana State University
2017-2021
Identified charged-particle spectra of ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, and $\overline{p}$ at midrapidity ($|y|<0.1$) measured by the $\mathit{dE}/\mathit{dx}$ method in STAR (solenoidal tracker BNL Relativistic Heavy Ion Collider) time projection chamber are reported for $\mathit{pp}$ $d+\mathrm{Au}$ collisions $\sqrt{{s}_{\mathit{NN}}}=200$ GeV $\mathrm{Au}+\mathrm{Au}$ 62.4, 130, 200 GeV. Average transverse momenta, total...
Based on the full BaBar data sample, we report improved measurements of ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B l Nu), where is either e or mu. These are sensitive to new physics contributions in form a charged Higgs boson. We measure R(D) 0.440 +- 0.058 0.042 and R(D*) 0.332 0.024 0.018, which exceed Standard Model expectations by 2.0 sigma 2.7 sigma, respectively. Taken together, our results disagree with these at 3.4 level. This excess cannot be explained boson type II two-Higgs-doublet...
Dark sectors charged under a new Abelian interaction have recently received much attention in the context of dark matter models. These models introduce light mediator, so-called photon (A′), connecting sector to standard model. We present search for reaction e+e−→γA′, A′→e+e−, μ+μ− using 514 fb−1 data collected with BABAR detector. observe no statistically significant deviations from model predictions, and we set 90% confidence level upper limits on mixing strength between at 10−4−10−3...
A precise measurement of the cross section process e+ e- to pi+ pi- (gamma) from threshold an energy 3 GeV is obtained with initial state radiation (ISR) method using 232 fb^-1 data collected BABAR detector at center-of-mass energies near 10.6 GeV. The ISR luminosity determined a study leptonic mu+ mu- gamma (gamma). leading-order hadronic contribution muon magnetic anomaly calculated pi measured 1.8 (514.1 +-2.2(stat} +-3.1(syst}) x 10^{-10}.
Nuclear collisions recreate conditions in the universe microseconds after Big Bang. Only a very small fraction of emitted fragments are light nuclei, but these states fundamental interest. We report observation antihypertritons - composed an antiproton, antineutron, and antilambda hyperon produced by colliding gold nuclei at high energy. Our analysis yields 70 +- 17 157 30 hypertritons. The measured hypertriton (antihypertriton) helium3 (antihelium3) similar, suggesting equilibrium...
Transverse momentum spectra of pi+/-, p, and p up to 12 GeV/c at midrapidity in centrality selected Au + collisions square root sNN=200 GeV are presented. In central collisions, both pi +/- p(p) show significant suppression with respect binary scaling pT approximately >4 GeV/c. Protons antiprotons less suppressed than the range 1.5 < 6 The pi-/pi+ p/p ratios most a weak dependence no dependence. p/pi approach values d >5 results high indicate that partonic sources have similar energy loss...
A precise measurement of the cross section process $e^+e^-\toπ^+π^-(γ)$ from threshold to an energy 3GeV is obtained with initial-state radiation (ISR) method using 232fb$^{-1}$ data collected BaBar detector at $e^+e^-$ center-of-mass energies near 10.6GeV. The ISR luminosity determined a study leptonic $e^+e^-\toμ^+μ^-(γ)γ_{\rm ISR}$, which found agree next-to-leading-order QED prediction within 1.1%. for systematic uncertainty 0.5% in dominant $ρ$ resonance region. leading-order hadronic...
In a sample of $471\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected with the BABAR detector at PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider we study rare decays $B\ensuremath{\rightarrow}{K}^{(*)}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$, where ${\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ is either or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$. We report results on partial branching fractions and isospin...
We search for the flavor-changing neutral-current decays $B\ensuremath{\rightarrow}{K}^{(*)}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, and invisible $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ via $B\ensuremath{\rightarrow}{K}^{(*)}J/\ensuremath{\psi}$ $B\ensuremath{\rightarrow}{K}^{(*)}\ensuremath{\psi}(2S)$, respectively, using a data sample of...
We present a study of the decays B^{0,+} --> J/psi pi^+ pi^- pi^0 K^{0,+}, using 467 10^6 BBbar pairs recorded with BABAR detector. evidence for decay mode X(3872) omega, product branching fractions B(B^+ X(3872)K^+) B(X(3872) omega) =[0.6\pm0.2\stat \pm 0.1\syst ] 10^{-5}, and B(B^0 X(3872)K^0) =[0.6\pm0.3\stat 10^{-5}. A detailed mass distribution from favors negative-parity assignment.
Measurements of the production forward π0 mesons from p+p and d+Au collisions at √sNN=200 GeV are reported. The yield generally agrees with next-to-leading order perturbative QCD calculations. per binary collision is suppressed as η increases, decreasing to ∼30% ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements azimuthal correlations charged hadrons η≈0 show a recoil peak in that low pion energy. These observations qualitatively consistent saturation picture low-x gluon...
In a search for $B\ensuremath{\rightarrow}c\overline{c}\ensuremath{\gamma}K$ decays with the BABAR detector, where $c\overline{c}$ includes $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$, $K$ ${K}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}_{S}^{0}$, ${K}^{*}(892)$, we find evidence $X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\gamma}$ $X(3872)\ensuremath{\rightarrow}\ensuremath{\psi}(2S)\ensuremath{\gamma}$ $3.6\ensuremath{\sigma}$ $3.5\ensuremath{\sigma}$ significance,...
We report on the first measurement of elliptic flow v2(pT) multistrange baryons Xi- +Xi+ and Omega- + Omega+ in heavy-ion collisions. In minimum-bias Au+Au collisions at square root s(NN)=200 GeV, a significant amount flow, comparable to other nonstrange baryons, is observed for which are expected be particularly sensitive dynamics partonic stage The pT dependence v2 confirms number constituent quark scaling previously lighter hadrons. These results support idea that substantial fraction...
We report the results of a search for bottomonium ground state eta_b(1S) in photon energy spectrum with sample (109 +/- 1) million Upsilon(3S) recorded at BABAR detector PEP-II B factory SLAC. observe peak E_gamma = 921.2 {+2.1} {-2.8} (stat) 2.4(syst) MeV significance 10 standard deviations. interpret observed as being due to monochromatic photons from radiative transition -> gamma eta_b(1S). This corresponds an mass $9388.9 {+3.1} {-2.3} 2.7(syst) MeV/c2. The hyperfine...
The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated luminosity collected with the BABAR detector at PEP-II collider, an center-of-mass energy 10.6 GeV. From analysis invariant mass spectrum, dependence cross section for measured from threshold to 4.5 ratio electric and magnetic form factors, |G_E/G_M|, asymmetry in proton angular distribution are masses below 3 We also measure branching fractions decays J/psi psi(2S) anti p.
We report the results of a search for $Z(4430)^-$ decay to $J/\psi\pi^-$ or $\psi(2S)\pi^-$ in $B^{-,0}\to \jpsi\pi^- K^{0,+}$ and \psitwos \pi^- decays. The data were collected with BABAR detector at SLAC PEP-II asymmetric-energy $e^+e^-$ collider operating center mass energy 10.58 \gev, sample corresponds an integrated luminosity 413 fb$^{-1}$. Each $K\pi$ distribution exhibits clear $K^{\ast}(892)$ $K^{\ast}_2(1430)$ signals, efficiency-corrected spectrum is well-described by...
The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of spin-orbit coupling, particles produced such a could become globally polarized along the direction We present results \ensuremath{\Lambda} and $\overline{\ensuremath{\Lambda}}$ hyperon global polarization measurements Au+Au at $\sqrt{{s}_{\mathit{NN}}}=62.4$ 200 GeV performed with STAR detector BNL Relativistic Heavy Ion Collider (RHIC). observed hyperons acceptance...
We present an analysis of exclusive charmless semileptonic B-meson decays based on 377 million BBbar pairs recorded with the BABAR detector at Upsilon(4S) resonance. select four event samples corresponding to decay modes B0 --> pi- l+ nu, B+ pi0 rho- and -> rho0 find measured branching fractions be consistent isospin symmetry. Assuming symmetry, we combine two B pi l nu samples, similarly rho measure BF(B0 nu) = (1.41 +- 0.05 0.07) x 10^-4 (1.75 0.15 0.27) 10^-4, where errors are statistical...
We report measurements of charmed-hadron $({D}^{0},{D}^{*})$ production cross sections at midrapidity in $p+p$ collisions a center-of-mass energy 200 GeV by the STAR experiment. Charmed hadrons were reconstructed via hadronic decays ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ and their charge conjugates,...
We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (m_{χ}) via WIMP-nucleus spin-independent scattering Migdal effect incorporated. Analysis time-integrated (TI) and annual modulation (AM) effects CDEX-1B data are performed, 737.1 kg day exposure 160 eVee threshold for TI analysis, 1107.5 250 AM analysis. The sensitive windows in m_{χ} expanded by an order magnitude to lower DM New limits σ_{χN}^{SI} at 90% confidence level derived as...
We report the first results of a light weakly interacting massive particles (WIMPs) search from CDEX-10 experiment with 10 kg germanium detector array immersed in liquid nitrogen at China Jinping Underground Laboratory physics data size 102.8 day. At an analysis threshold 160 eVee, improved limits 8×10^{-42} and 3×10^{-36} cm^{2} 90% confidence level on spin-independent spin-dependent WIMP-nucleon cross sections, respectively, WIMP mass (m_{χ}) 5 GeV/c^{2} are achieved. The lower reach m_{χ}...
We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $467.8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at $\ensuremath{\Upsilon}(4S)$ resonance with BABAR detector SLAC PEP-II $B$-Factory. select sample of events one completely reconstructed ${B}^{\ensuremath{-}}$ in hadronic mode (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{X}^{\ensuremath{-}}$ and...