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Min Yuan

Publications and source records attributed to Min Yuan.

4 recordsLinked to original sources
arXiv2025

Search for the $D^{*}\bar{D}^{*}$ Molecular State $X_{2}(4013)$ in $K^{-}p$ and $pp$ Collisions

Motivated by the interpretation of $X(3872)$ as a $D\bar{D}^{*}$ molecular state, heavy-quark spin symmetry predicts a spin-2 partner, $X_{2}(4013)$, which can be regarded as a $D^{*}\bar{D}^{*}$ molecule with quantum numbers $J^{PC} = 2^{++}$. Its experimental confirmation, however, remains elusive. In this work, we investigate the production mechanisms of $X_{2}(4013)$ in the reactions $K^{-}p \to \Lambda_{c}^{+} D_{s}^{-} X_{2}(4013)$ and $pp \to \Lambda_{c}^{+}\Lambda_{c}^{+} X_{2}(4013)$ within an effective Lagrangian framework. The production processes are modeled via $t$-channel $D/\bar{D}^{*}$ meson exchanges, while initial-state interactions (ISI) mediated by Pomeron and Reggeon exchanges are also taken into account. Our calculations indicate that the total cross sections can reach the pb level, suggesting that $X_{2}(4013)$ may be accessible at current and future experiments such as AMBER@CERN and LHCb. Inclusion of ISI enhances the cross sections by nearly one order of magnitude. The differential distributions show distinct angular behaviors for the two reactions: the $K^{-}p$ reaction exhibits a forward-peaked distribution, whereas the $pp$ reaction shows a dip near central angles. This study provides a quantitative theoretical benchmark for future experimental searches of $X_2(4013)$ and highlights the importance of initial-state interactions (ISI) in high-energy particle investigations.

hep-ph↗
arXiv2025

A search for $B_{s0}^{*}$ and $B^{*}_{s1}$ through the $K^{-}p$ interaction

Studying heavy-quark hadrons is crucial due to the nonperturbative nature of low-energy QCD, with Heavy-Quark Symmetry (HQS) serving as a key framework for understanding their spin and flavor symmetries. However, a key issue is that the theoretically expected $B^{(*)}\bar{K}$ molecular states have not yet been observed, although they are considered the bottom-quark counterparts of the observed $\bar{D}^{(*)}\bar{K}$ molecular states (corresponding to $D_{s0}(2317/2460)^{-}$), which challenges the universality of HQS. The main goal of this work is to search for the theoretically predicted $B\bar{K}$ and $B^{*}\bar{K}$ molecular states, namely $B_{s0}^{*}(5725)$ and $B_{s1}^{*}(5778)$, via the reactions $K^{-}p \to \Lambda_{b}^{0} B_{s0}^{*}$ and $K^{-}p \to \Lambda_{b}^{0} B_{s1}^{*}$. Within an effective Lagrangian framework, we compute the relevant cross sections, considering $t$-channel $B^{(*)}$ exchanges and $K^{-}p$ initial-state interactions (ISI). The results show that the production cross sections of $B_{s0}^{*}(5725)$ and $B_{s1}^{*}(5778)$ can reach the order of 0.01~nb, and we suggest that experiments searching for $B_{s0}^{*}(5725)$ are best performed at $P_{K^{-}} = 12.18~\mathrm{GeV}$, while higher energies are most favorable for producing $B_{s1}^{*}(5778)$. The ISI play a crucial role, as they not only significantly enhance the production cross sections of $B_{s0}^{*}(5725)$ and $B_{s1}^{*}(5778)$ (by roughly one order of magnitude) but also markedly affect the angular distributions of the produced particles. We also calculated the production cross sections of the conventional quark-antiquark states $B_{s0}^*(5700)$ and $B_{s1}^*(5720)$, which are found to be nearly the same as those of $B_{s0}^{*}(5725)$ and $B_{s1}^{*}(5778)$. Although their internal structures remain ambiguous, these results can inform future experimental searches at CERN and J-PARC.

hep-ph↗
arXiv2022

Quasi-periodic behaviour in the $γ$-ray light curve of the blazar PKS 0405-385

We analyze the quasi-periodic oscillation (QPO) of the historical light curve of FSRQs PKS 0405-385 detected by the Fermi LAT from August 2008 to November 2021. To identify and determine the QPO signal of PKS 0405-385 in the $γ$-ray light curve, we use four time series analysis techniques based on frequency and time domains, i.e., the Lomb-Scargle periodogram (LSP), the weighted wavelet z-transform (WWZ), the REDFIT and the epoch folding. The results show that PKS 0405-385 has a quasi-periodic behavior of $\sim$2.8 yr with the significance of $\sim$4.3$σ$ in Fermi long-term monitoring. Remarkably, we also performed QPO analysis in the G-band light curve observed from October 2014 to October 2021 using LSP and WWZ technology, and the results ($\sim$4$σ$ of significance) are consistent with the periodic detection in $γ$-ray. This may imply that the optical emission is radiated by an electron population same as the \gr\ emission. In discussing the possible mechanism of quasi-periodic behavior, either the helical motion within a jet or the supermassive black hole binary system provides a viable explanation for the QPO of 2.8 yr, and the relevant parameters have been estimated.

astro-ph.HE↗
arXiv2015

Tunable Quantum Spin Hall Effect via Strain in two-Dimensional Arsenene Monolayer

The search for new quantum spin Hall (QSH) phase and effective manipulations of their edge states are very important for both fundamental sciences and practical applications. Here, we use first-principles calculations to study the strain-driven topological phase transition of two-dimensional (2D) arsenene monolayer. We find that the band gap of arsenene decreases with increasing strain and changes from indirect to direct, and then the s-p band inversion takes place at Γ point as the tensile strain is larger than 11.14%, which lead to a nontrivially topological state. A single pair of topologically protected helical edge states is established for the edge of arsenene, and their QSH states are confirmed with nontrivial topological invariant Z2 = 1. We also propose high-dielectric BN as an ideal substrate for the experimental synthesis of arsenene, maintaining its nontrivial topology. These findings provide a promising candidate platform for topological phenomena and new quantum devices operating at nanoelectronics.

cond-mat.mtrl-sci↗