Lei Zhao

Publications : 128
Aldex : 100
H-index : 8
Citations : 293

physics

Super-resolution imaging of dielectric objects using a slab of left-handed material

Lei Zhao, Tie Jun Cui

Oct 2, 2006 in Applied Physics Letters
The Born iterative method has been presented to study two-dimensional inverse scattering problems for dielectric objects with the aid of left-handed material (LHM). Super-resolution imaging can be achieved since the LHM slab could amplify evanescent waves emitted from transmitters, which are interacted with the dielectric objects and then captured by receivers. The evanescent waves contain high-fr...

Study of the Semileptonic Decay $Λ c^ plus \rightarrow Λ e^ plus ν e$

M. Ablikim, J. H. Zou et 572 al.

Jul 28, 2022 in Arxiv
The measurement of the Cabibbo-favored semileptonic decay $\Lambda_c^+\rightarrow \Lambda e^+\nu_e$ is reported using a $4.5~\mathrm{fb}^{-1}$ data sample of $e^+e^-$ annihilations collected at center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be $\mathcal{B}(\Lambda_c^+\rightarrow \Lambda...

First Observation of the Semileptonic Decay $Λ c^ plus \rightarrow pK^- e^ plus ν e$

M. Ablikim, J. H. Zou et 572 al.

Jul 23, 2022 in Arxiv
Using $4.5 \mathrm{fb}^{-1}$ of $e^+e^-$ annihilation data samples collected at the center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider, a first study of $\Lambda_c^+$ decaying semileptonically into the inclusive $pK^-$ system $\Lambda_c^+\rightarrow pK^-e^+\nu_e$ is performed. The $\Lambda_c^+\rightarrow pK^-e^+\nu_e$ decay is observed with ...

Study of $ψ(3686)\rightarrowΛ\barΛω$

BESIII Collaboration, J. H. Zou et 563 al.

Jul 24, 2022 in Arxiv
Based on a data sample of $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the branching fraction of $\psi(3686)\rightarrow\Lambda\bar{\Lambda}\omega$ is measured to be $\rm (3.30\pm0.34(stat.)\pm0.29(syst. ))\times10^{-5}$ for the first time. The invariant mass spectrum of $\Lambda\omega$ (or $\bar{\Lambda}\omega$) shows evidence of a resona...

Measurement of Branching Fractions of Singly Cabibbo-suppressed Decays $Λ c^ plus \rightarrow Σ^{0} K^ plus $ and $Σ^{ plus } K {S}^0$

BESIII Collaboration, J. H. Zou et 578 al.

Jul 22, 2022 in Arxiv
Based on a sample of 4.4 $\mathrm{fb}^{-1}$ of $e^{+}e^{-}$ annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays $\Lambda_c^+ \rightarrow \Sigma^0 K^+$ and $\Lambda_{c}^{+} \rightarrow \Sigma^+ K_{S}^0$ are studied. The ratio of the branching fraction $\mathcal{B}(\Lambda_c^+ \rightarrow \Sigma^0 K^+)$...

Search for the weak decay $ψ(3686) \to Λ c^{ plus } \barΣ^- plus c.c

BESIII Collaboration, J. Zu et 581 al.

Jul 22, 2022 in Arxiv
Using $(448.1 \pm 2.9) \times 10^{6}$ $\psi(3686)$ events collected with the BESIII detector, we perform the first search for the weak baryonic decay $\psi(3686) \to \Lambda_c^{+} \bar{\Sigma}^- +c.c.$. The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction ($\mathcal B$) of $\psi(3686) \to \Lambda_c^{+} \bar{\Si...

Randomized Coordinate Subgradient Method for Nonsmooth Optimization

Lei Zhao, Xiao Li et 3 al.

Jun 30, 2022 in Arxiv
Nonsmooth optimization finds wide applications in many engineering fields. In this work, we propose to utilize the {Randomized Coordinate Subgradient Method } (RCS) for solving both nonsmooth convex and nonsmooth nonconvex (nonsmooth weakly convex) optimization problems. At each iteration, RCS randomly selects one block coordinate rather than all the coordinates to update. Motivated by practical ...

A numerical analysis of planar central and balanced configurations in the (n plus 1)-body problem with a small mass

Alexandru Doicu, Adrian Doicu et 2 al.

Jul 10, 2022 in Arxiv
Two numerical algorithms for analyzing planar central and balanced configurations in the $(n+1)$-body problem with a small mass are presented. The first one relies on a direct solution method of the $(n+1)$-body problem by using a stochastic optimization approach, while the second one relies on an analytic-continuation method, which involves the solutions of the $n$-body and the restricted $(n+1)$...

Evidence for a neutral near-threshold structure in the $K^{0} {\rm S}$ recoil-mass spectra in $e^ plus e^-\rightarrow K^{0} {\rm S}D s^ plus D^{*-}$ and $e^ plus e^-\rightarrow K^{0} {\rm S}D s^{* plus }D^{-}$

M. Ablikim, J. H. Zou et 570 al.

Apr 28, 2022 in Arxiv
We study the processes $e^+e^-\rightarrow K^{0}_{\rm S}D_s^+D^{*-}$ and $e^+e^-\rightarrow K^{0}_{\rm S}D_s^{*+}D^{-}$, as well as their charge conjugated processes, at five center-of-mass energies between 4.628~GeV and 4.699~GeV, using data samples corresponding to an integrated luminosity of $3.8~\rm{fb^{-1}}$ collected by the BESIII detector at the BEPCII storage ring. Based on a partial recons...

Partial wave analysis of $J/ψ\rightarrowγηη'$

M. Ablikim, J. H. Zou et 538 al.

Feb 1, 2022 in Arxiv
Based on a sample of (10.09$\pm$0.04)$\times$10$^{9}$ $J/\psi$ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay $J/\psi \rightarrow \gamma\eta\eta'$ is performed. An isoscalar state with exotic quantum numbers $J^{PC}=1^{-+}$, denoted as $\eta_1(1855)$, has been observed for the first time with statistical significance larger than...

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