We estimate the $Υ$, $η_b$ and $B^*$ meson mass shifts in symmetric nuclear matter. The interest is, whether the strengths of the bottomonium-(nuclear matter) and charmonium-(nuclear matter) interactions are similar or different. This is because, each ($J/Ψ,Υ$) and ($η_c,η_b$) meson group is usually assumed to have very similar properties based on the heavy charm and bottom quark masses. The estimate for the $Υ$ is made using an SU(5) effective Lagrangian and the anomalous coupling one, by studying the $BB$, $BB^*$, and $B^*B^*$ meson loop contributions for the self-energy. As for the $η_b$, we include the $BB^*$ and $B^*B^*$ meson loop contributions in the self-energy. The in-medium masses of the $B$ and $B^*$ mesons appearing in the self-energy are calculated by the quark-meson coupling model. An analysis on the $BB$, $BB^*$, and $B^*B^*$ meson loops in the $Υ$ mass shift is made by comparing with the corresponding $DD, DD^*$, and $D^*D^*$ meson loops for the $J/Ψ$ mass shift. Our prediction for the $η_b$ mass shift is made including only the lowest order $BB^*$ meson loop. The $Υ$ mass shift, with including only the $BB$ loop, is predicted to be -16 to -22 MeV at the nuclear matter saturation density using the $ΥBB$ coupling constant determined by the vector meson dominance model with the experimental data, while the $η_b$ mass shift is predicted to be -75 to -82 MeV with the SU(5) universal coupling constant determined by the $ΥBB$ coupling constant. Our results show an appreciable difference between the bottomonium-(nuclear matter) and charmonium-(nuclear matter) interaction strengths. We also study the $Υ$ and $η_b$ mass shifts in a heavy quark (heavy meson) symmetry limit.
[1]Title: $Υ$ and $η_b$ mass shifts in nuclear matter and the $^{12}$C nucleus bound states, [2]Title: $Υ$ and $η_b$ mass shifts in nuclear matter and the nucleus bound states
[1]摘要：这是基于文章的PANIC 2021程序的贡献，Eur. Phys. J. A 57，259（2021）和随附文章$[$ arXiv：2109.08636 $[$ hep-ph $]]$（Hadron 2021贡献）。本文首次用SU（5）味对称有效拉格朗日方法估计了对称核物质中$Υ$和$η_b$介子的质量移动，并用夸克-介子耦合模型估计了介质中$B^*$介子的质量.得到了$Υ$ -和$η_b$ -核物质的吸引势，并期望这些介子形成核束缚态。我们确实发现了这样的与$^{12}$ C核的核束缚态，其中关于$^{12}$ C核束缚态能量的结果是新的，我们在此首次报道。[2]摘要：首次用有效拉格朗日方法估计了对称核物质中$Υ$和$η_b$介子的质量位移（标量势），并用夸克-介子耦合模型估计了$B^*$介子的介质质量. $Υ$和$η_b$的吸引势都足够强，可以使这些介子束缚在$^4$ He核上，我们得到了这样的核束缚态能量.
Constraining the strangeness content of the nucleon by measuring the $ϕ$ meson mass shift in nuclear matter
利用QCD求和规则和最大熵方法研究了有限密度下$ϕ$介子的行为。结果表明，核物质中$ϕ$可能的质量移动与核子的奇异含量密切相关，核子的奇异含量与奇异σ项$σ_{sN} = m_s \langle N | \overline{s}s | N \rangle$成正比.我们的结果进一步表明，根据$σ_{sN}$的值，$ϕ$介子在核物质密度下可以得到正的或负的质量移动。我们发现，这些结果仅弱依赖于潜在的修改的宽度的$ϕ$介子峰和假设的行为的四夸克凝聚在有限密度。为了检验结果的稳定性，我们考虑了对算子乘积展开展开的高阶修正，包括$α_s$修正、奇异夸克质量的高阶项和早期工作中未考虑的高扭曲项.
经过数十年的尝试来测量质量位移和理解强子质量的起源，很明显，人们必须分析具有小真空宽度的强子。此外，为了确定手征对称性破缺的影响，必须从观察手征伙伴开始。在这次演讲中，我将回顾为什么这种考虑不可避免地导致我们考虑$K^*$和核物质中的$K_1$ [T.宋，T. Hatsuda，S H Lee，PLB792（2019）160-169]。在JPARC的K介子束中，人们可以在核靶实验中观察到两种粒子的质量漂移。一旦测量了$K^*$和$K_1$介子的质量和质量差，我们将更接近于理解强子质量的起源和手征对称性破缺的影响。
Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom Samples
研究了基态碱金属原子在E和B场作用下的手征性，用圆偏振激光束修饰，并与场助禁戒跃迁（如Fr中的7S-8 S）密切失谐，预测了它们的子能级的宇称破坏能移，在E中呈线性，和弱核电荷Q_W $. A dressing beam of 10 kW/cm$ ^2 $ at 506 nm produces a shift of $ \sim 100 μ $Hz at E=100 V/cm, B $ \gtrsim $30 mG. It should be observable with $ \sim 10^4 $ Fr atoms confined in an optical dipole trap. We discuss optimal conditions, parameter reversals and a calibration procedure to measure $ Q_W$。
