#### Lei Zhang

Publications : 145
Aldex : 100
H-index : 9
Citations : 269

### Measurement of $e^ plus e^- \rightarrow φη^{\prime}$ cross sections at center-of-mass energies between 3.508 and 4.600 GeV

#### BESIII Collaboration, J. Zu et 603 al.

###### Oct 13, 2022 in Arxiv
We present a measurement of the Born cross sections for $e^+ e^- \rightarrow \phi \eta^{\prime}$ at different center-of-mass energies between 3.508 and 4.600 GeV based on 15.1 fb$^{-1}$ of e+e− annihilation data collected with the BESIII detector operating at the BEPCII collider. In addition, a search for the decay $Y(4230) \to \phi \eta^{\prime}$ is performed. No clear signal is observed and the ...

### Observations of the Cabibbo-Suppressed decays $Λ {c}^{ plus }\to nπ^{ plus }π^{0}$, $nπ^{ plus }π^{-}π^{ plus }$ and the Cabibbo-Favored decay $Λ {c}^{ plus }\to nK^{-}π^{ plus }π^{ plus }$

#### BESIII Collaboration, J. H. Zou et 577 al.

###### Oct 7, 2022 in Arxiv
Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 $\rm{{fb}^{-1}}$, collected by the BESIII detector in the energy region between $4600$ MeV and $4699$ MeV, we report the first observations of the Cabibbo-suppressed decays $\Lambda_c^+\to n\pi^+\pi^0$, $\Lambda_c^+\to n\pi^+\pi^-\pi^+$, and the Cabibbo-favored decay $\Lambda_c^+\to nK^-\pi^+\pi^+$ w...

### DP-PSI: Private and Secure Set Intersection

#### Jian Du, Pu Duan et 5 al.

###### Aug 28, 2022 in Arxiv
One way to classify private set intersection (PSI) for secure 2-party computation is whether the intersection is (a) revealed to both parties or (b) hidden from both parties while only the computing function of the matched payload is exposed. Both aim to provide cryptographic security while avoiding exposing the unmatched elements of the other. They may, however, be insufficient to achieve securit...

### Amplitude analysis and branching fraction measurement of the decay \boldmath $D {s}^{ plus } \to K^ plus π^{ plus }π^{-}π^{0}$

#### BESIII Collaboration, J. H. Zou et 572 al.

###### May 27, 2022 in Arxiv
The singly Cabibbo-suppressed decay $D_{s}^{+} \to K^+\pi^{+}\pi^{-}\pi^{0}$ is observed, using a data set corresponding to an integrated luminosity of 6.32 $\rm fb^{-1}$ recorded by the BESIII detector at the centre-of-mass energies between 4.178 and 4.226 GeV. The first amplitude analysis of $D_{s}^{+} \to K^+\pi^{+}\pi^{-}\pi^{0}$ reveals the sub-structures in this decay and determines the frac...

### Error estimates for Euler discretization of high-index saddle dynamics

#### Lei Zhang et 3 al.

###### Nov 9, 2021 in Arxiv
High-index saddle dynamics provides an effective means to compute the any-index saddle points and construct the solution landscape. In this paper we prove error estimates for Euler discretization of high-index saddle dynamics with respect to the time step size, which remains untreated in the literature. We overcome the main difficulties that lie in the strong nonlinearity of the saddle dynamics an...

### On Non-simple blowup solutions of Liouville equation

#### Teresa D'Aprile, Lei Zhang et 2 al.

###### Sep 12, 2022 in Arxiv
For Liouville equation with quantized singular sources, the non-simple blowup phenomenon has been a major difficulty for years. It was conjectured by the first two authors that the non-simple blowup phenomenon does not occur if the equation is defined on the unit ball with Dirichlet boundary condition. In this article we not only completely settle this conjecture in its entirety, but also extend o...

### Observation of $e^ plus e^-\toπ^0π^0ψ 2(3823)$

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

###### Sep 29, 2022 in Arxiv
Using a data sample corresponding to an integrated luminosity of 11.3 $\rm fb^{-1}$ collected at center-of-mass energies from $4.23$ to $4.70$~GeV with the BESIII detector, we observe the process $e^+e^-\to\pi^0\pi^0\psi_2(3823)$ for the first time with a statistical significance of $6.0\sigma$. The ratio of average cross sections for $e^+e^-\to\pi^0\pi^0\psi_2(3823)$ over $\pi^+\pi^-\psi_2(3823)$...

### Observation of the decay $ψ(3686) \to Σ^-\barΣ^ plus$ and measurement of its angular distribution

#### BESIII Collaboration, J. Zu et 577 al.

###### Sep 29, 2022 in Arxiv
Using $(448.1\pm2.9)\times10^6$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the decay $\psi(3686)\to\Sigma^-\bar\Sigma^+$ is observed for the first time with a branching fraction of $(2.84\pm0.04_{\rm stat. }\pm0.08_{\rm syst. })\times10^{-4}$, and the angular parameter $\alpha_{ \Sigma^-}$ is measured to be $0.96\pm0.09_{\rm stat.} \pm 0.03_{\rm syst. }$.

### \boldmath Search for invisible decays of a dark photon using $e^ plus e^-$ annihilation data at BESIII

#### BESIII Collaboration, J. H. Zou et 577 al.

###### Sep 28, 2022 in Arxiv
We report a search for a dark photon using $14.9$ fb$^{-1}$ of $e^+e^-$ annihilation data taken at center-of-mass energies from 4.13 to 4.60 GeV with the BESIII detector operated at the BEPCII storage ring. The dark photon is assumed to be produced in the initial state radiation process and to predominantly decay into light dark matter particles, which escape from the detector undetected. The mass...