The Properties of Radially Excited Charmonia in The Light Front Quark Model
Muhammad Ridwan, Ahmad Jafar Arifi, Terry Mart
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ITM Web Conf. Volume 61, 2024, The 9th International Symposium on Current Progress in Mathematics and Sciences 2023 (The 9th ISCPMS 2023) in conjunction with AUA Academic Conference on the Application of Artificial Intelligences and Data Sciences in a Modern Science for a Better Life, 9 pages
Investigating the properties of excited charmonia is important to clarify its internal structure. In this paper, we present the mass spectra (MS) and decay constants (DC) for charmonia up to 3S states calculated by means of the light-front quark model based on a variational approach. In particular, we consider the QCD-motivated effective Hamiltonian, which includes both confinement (linear and screened) and Coulomb-like potentials. Furthermore, since the existence of the nature of heavy quark symmetry, we treat hyperfine interactions perturbatively. We developed the harmonic oscillator expansion method to approximate the wave function (WF) for excited states. We found that the results of our theoretical calculations, using screened potentials rather than linear ones, are in good agreement with experimental data. By looking at the mass and decay constant result, we found that our result on the ψ(3S) state matched the properties of the ψ(4040) resonance.
Central exclusive production of scalar and pseudoscalar charmonia in the light-front $k_T$-factorization approach
本文研究了在LHC能区质子-质子碰撞中标量$χ_{c0}\equiv χ_c(0^{++})$和赝标量$η_c$ charmonia态的排他性产生。在$k_{T}$ -因子分解方法中推导出$gg \to χ_{c0}$和$gg \to η_c$机制的振幅。首次讨论了$p p \to p p η_c$反应。计算了快度、横动量分布以及相关观测量的相对方位角分布和$(t_1,t_2)$分布。对于$χ_{c0}$和$η_c$情况，后两个观测值非常不同。与文献中最近考虑的这些介子的包容性产生相反，在排他性的情况下，$η_c$的截面远低于$χ_{c0}$，这是由于用于计算截面的相应顶点和非对角UGDF的特殊相互作用。我们给出了在光阵面夸克偶子波函数势模型框架下的关键观测量的数值结果。我们还讨论了如何不同的吸收校正这两种情况下考虑。
Higgs decay to charmonia and the charm-quark Yukawa coupling
在2012年发现希格斯粒子的伟大胜利之后，能量前沿的下一个目标将是研究希格斯粒子的性质，并寻找超越SM的下一个尺度。在实验上，$H\to c \bar{c}$通道将是非常难以挖掘出来，因为这两个弱汤川耦合和令人生畏的SM di-jet背景。我们建议在大型强子对撞机和未来的强子对撞机上用希格斯玻色子通过粲夸克碎裂衰变到$J/ψ$来检验粲夸克汤川耦合。利用非相对论量子色动力学（NRQCD）方法，研究了希格斯玻色子衰变通道$ H \to c \ \bar{c} + J/ψ$（或$ η_c $）的粲夸克偶素产生，其中考虑了色单重态和色八重态的贡献.我们的结果打开了另一扇门，以改善在LHC的Higgs汤川耦合的测定：从这种衰变模式的最终状态是非常独特的$J/ψ\to e^+e^-,\, μ^+μ^-$和支化分数是由粲夸克碎裂机制增强。
$D_{(s)}(2S)$ and $D^{*}_{(s)}(2S)$ production in nonleptonic $B_{(s)}$ weak decays
Bingtuan Xingxin Vocational and Technical College（兵团新星职业技术学院）；Henan University of Technology（河南工业大学）；Jinan University（暨南大学）；Huanghe Jiaotong University（黄河交通学院）
