恒星晚期演化中millicharged粒子的产生

Probing millicharged particles with NA64 experiment at CERN

In this note we estimate the sensitivity of the NA64 experiment to millicharged particles ($χ$). That experimental facility is dedicated to the searching for dark sector particles in missing energy events at the CERN SPS. We consider missing momentum signatures in the $\simeq$ 100 GeV electron and muon beams and show that the later one allows to obtain more stringent bounds on the millicharge $Q_χ$, which for the $χ$ masses $100$~MeV $\leq m_χ \leq 500$~MeV at the level $ Q_χ/e\lesssim O(10^{-3}) - O(10^{-2})$.

微带电粒子的卡文迪许实验检验

Cavendish Tests of Millicharged Particles

本研究重新解读过往卡文迪许实验以约束地球微带电粒子群，并提出增设带电壳层的改进方案，可提升探测灵敏度，其亚GeV质量粒子搜索性能优于未来加速器实验。

来自渐近巨星分支的毫电荷粒子约束

Millicharged Particle Constraints from Asymptotic Giant Branch Stars

通过计算球状星团中低质量恒星渐近巨星分支与水平分支数量比R2，研究毫电荷粒子对恒星演化的影响，在10 keV至100 keV质量范围内给出了比现有约束强两个数量级的电荷上限。

能否在未来的超级陶粲装置上通过单$\pi^0$ 搜寻来探测微电荷？

Can millicharge be probed at future Super Tau Charm Facility via mono-$π^0$ searches?

本研究提出在未来超级陶粲装置上通过单$\pi^0$ 信号搜寻微电荷粒子的新通道，计算了信号与标准模型本底事例，推导了不同能量下的微电荷上限，指出该方法在低质量区有一定提升，可作为不可见粒子研究的补充。

Out-of-Equilibrium Photon Production in the Late Stages of Relativistic Heavy-Ion Collisions

In this work, we assess the importance of non-equilibrium dynamics in the production of photons from the late stages of relativistic heavy-ion collisions. The p$_\mathrm{T}$-differential spectra and $v_2$ of photons from the late hadronic stage are computed within a non-equilibrium hadron transport approach, and compared to the results of a local equilibrium evolution using ideal relativistic hydrodynamics. It is found that non-equilibrium dynamics enhance the late-stage photon production at low p$_\mathrm{T}$ and decreases it at higher p$_\mathrm{T}$ compared to the estimate from hydrodynamic…

强子湮灭后期大质量有色粒子的遗迹

The Relic Abundance of Massive Colored Particles after a Late Hadronic Annihilation Stage

我们讨论了大量的长寿命的有色粒子的质量的顺序为1 TeV的遗迹丰度。我们首先考察大质量有色粒子只有标准颜色的情况。接下来我们考虑M.卢蒂，其中有色粒子在一个比粒子质量小得多的非阿贝尔规范群下变换。在这两种情况下，遗迹丰度减少通过一个“后期”强子湮灭阶段。在第二种情况下，残余夸克与普通夸克结合，形成分数带电体和反常重同位素，残余夸克丰度的界限变得非常严格。然而，夸克之间的力有一个新的限制部分，通过宏观弦表现出来，由此产生的有效的“非常晚”的湮灭将遗迹丰度降低到可接受的水平。讨论了在LHC上产生和探测这种粒子的前景以及所产生粒子的命运。