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Dayoung Lee

Publications and source records attributed to Dayoung Lee.

3 recordsLinked to original sources
arXiv2025

Double $ϕ$-meson production via $\bar{p}p$ scattering

We investigate double $ϕ$ production in $\bar{p}p$ reactions near threshold using an effective Lagrangian approach, highlighting a significant OZI rule violation through hadronic processes. Our model includes $t$- and $u$-channel contributions from the nucleon and $s$-wave $N^*$ resonances ($N^*(1535,1650,1895)$), as well as the pentaquark-like state $P_s(2071)$. In the $s$-channel, scalar ($f_0$), tensor ($f_2$), and pseudoscalar ($η(2225)$) mesons are incorporated. The $N$, $N^*$, $f_0$, and $f_2$ contributions enhance the cross-section and generate peak structures near $W=2.2$ GeV, consistent with JETSET data, while cusp structures arise from $\barΛΛ$ and $\barΣΣ$ threshold openings. Polarization observables, such as the spin density matrix element (SDME), further elucidate the underlying hadronic mechanisms.

hep-ph↗
arXiv2025

Double $ϕ$ Production in $\bar{p}p$ Reactions Near Threshold

We employ an effective Lagrangian approach to investigate double $ϕ$ production in the $\bar{p}p$ reaction near the threshold and describe a notable violation of the Okubo-Zweig-Iizuka (OZI) rule in this reaction process through hadronic degrees of freedom, using the currently available theoretical and experimental information. The ground-state nucleon and its $s$-wave resonances, i.e., $N^*(1535,1650,1895)$, are taken into account in the $t$- and $u$-channel tree-level diagrams. The pentaquark-like nucleon resonance $P_s(2071,3/2^-)$ is also considered. In the $s$-channel diagrams, scalar and tensor mesons are incorporated, specifically $f_0(2020,2100,2200)$ and $f_2(1950,2010,2150)$, respectively, along with the pseudoscalar meson $η(2225)$. Our calculations suggest that contributions from the $N$ and $N^*$ resonances significantly enhance the cross-section near the threshold. At the same time, those from the $f_0$ and $f_2$ mesons produce distinctive peak structures around $W=2.2$ GeV, qualitatively reproducing the JETSET experimental data. The openings of the $\barΛΛ$ and $\barΣΣ$ channels lead to the cusp structures, which can explain the nontrivial structures in the cross-section at $W\approx2M_Λ$ and $2M_Σ$ observed in the data. It turns out that contributions from the $η$ and $P_s$ resonances are almost negligible. Additionally, polarization observables such as the spin density matrix element (SDME) provide crucial insights into the individual hadronic processes involved in this reaction.

hep-ph↗
arXiv2024

Strangeness plus-one ($S=+1$) resonance-state $P^{+*}_0$ via $K^+n\to K^{*0}p$

In our current study, we delve into the peak-like structure observed during the reaction process of $K^+n\to K^{0}p$ at approximately $\sqrt{s}\sim2.5$ GeV. Our focus centers on exploring the potential $S=+1$ resonance $P^{+*}_0\equiv P^*_0$ as an excited state within the extended vector-meson and baryon ($VB$) antidecuplet. To achieve this aim, we employ the effective Lagrangian method in conjunction with the $(u,t)$-channel Regge approach, operating within the tree-level Born approximation. We thoroughly examine various spin-parity quantum numbers for the resonance, resulting in a compelling description of the data, where $M_{P^*_0}\approx2.5$ GeV and $Γ_{P^*_0}\approx100$ MeV. Furthermore, we propose an experimental technique to amplify the signal-to-noise ratio ($S/N$) for accurately measuring the resonance. Notably, our findings reveal that background interference diminishes significantly within the $K^*$ forward-scattering region in the center-of-mass frame when the $K^*$ is perpendicularly polarized to the reaction plane. Additionally, we explore the recoil-proton spin asymmetry to definitively determine the spin and parity of the resonance. This study stands to serve as a valuable reference for designing experimental setups aimed at investigating and comprehending exotic phenomena in QCD. Specifically, our insights will inform future J-PARC experiments, particularly those employing higher kaon beam energies.

hep-ph↗