Conveners
分会场一: 实验进展
- Jinhui Chen ()
分会场一: 机器学习等
- Qiye Shou (Fudan University)
分会场一: QCD相结构
- Hengtong Ding (Institute of Particle Physics, Central China Normal University)
分会场一: 初态核效应
- KaiJia Sun (Institute of Modern Physics, Fudan University)
分会场一: 理论进展
- Yifeng Sun (Shanghai Jiao Tong University)
分会场一: 理论进展
- Defu Hou (CCNU)
在粒子物理与核物理领域，多数实验采用大型通用探测谱仪开展综合性物理研究，如BESIII、Belle-II、LHCb、STAR、ATLAS、CMS等。通用型探测器谱仪依托偏转磁场，利用径迹探测器、粒子鉴别探测器、量能器等，分层次测量末态粒子的动量、能量、飞行时间、能量损失等，进而重建末态粒子的位置、四动量信息。但是，末态粒子的极化并未测量，导致末态粒子的信息不完备，影响物理信息的更准确提取。本报告中，我们将提出包含末态核子极化测量功能的新型谱仪概念。对现有实验及未来大科学装置，利用该方法可以在不影响原有探测器性能的前提下，额外获取末态核子极化测量功能。通过末态核子极化的新自由度，将拓宽中高能核物理领域实验方向。
即将建成的强流重离子加速器装置HIAF可以提供几个GeV能量的质子和重离子束流，为广泛的物理研究提供了良好的机遇，包括寻找超出标准模型的新粒子、新相互作用，检验CP等基本对称性，寻找新（奇特）强子态、奇特双重子态、新（多奇异）超核，强子、超核性质的精确测量，核物质相边界和相变临界点的发现和定位，等等。我们计划在HIAF高能终端，建设一个由螺线管磁铁、硅像素径迹探测器、LGAD飞行时间探测器、切伦科夫光-闪烁光双读出电磁量能器构成的实验谱仪，实现大接受度、1MHz-100MHz的极高事例率、多种粒子鉴别能力和几十微米量级的高位置分辨能力，从而满足上述物理研究的需求，促进基于我国实验装置的中高能粒子物理与核物理研究发展。报告将介绍实验的概念设计和初步模拟结果等。
We apply a Dense Neural Network (DNN) approach to reconstruct jet momentum within a quark-gluon plasma (QGP) background, using simulated data from PYTHIA and Linear Boltzmann Transport (LBT) Models for comparative analysis. We find that medium response particles from the LBT simulation, scattered out of the QGP background but belonging to medium-modified jets, can inevitably lead to...
Accurately determining the nuclear equation of state (EoS) at finite baryon chemical potential ($\mu_B$) is crucial yet challenging in studying QCD matter under extreme conditions. This study develops a deep learning-assisted quasi-parton model using three deep neural networks. It reconstructs the QCD EoS at zero $\mu_B$ and predicts the EoS and transport coefficient $\eta/s$ at finite...
Large density fluctuations near the QCD critical point have been suggested to exhibit power-law behaviors, which can be probed by intermittency analysis in heavy-ion collisions.
This talk will cover the latest experimental findings on intermittency from NA61/SHINE and NA49 at SPS, as well as the STAR Collaboration at RHIC. The experimental studies reveal that the signal of critical...
Light nuclei, as loosely bound objects with binding energies of a few MeV, provide a unique probe of the QCD phase structure and the nucleon coalescence mechanism in heavy-ion collisions. The systematic study of light nuclei production over a broad energy range enables insights into the properties of the dense baryonic matter created in such collisions. In the RHIC beam energy scan (BES)...
We illustrate that the nuclear liquid gas transition of nucleon can be described in quantum chromodynamics through combining the quark gap equation and Faddeev equation of nucleon. We investigate the liquid gas transition at zero temperature and
finite chemical potential, and analyze that there exists a finite difference of gas and liquid solution of quark propagator due to the shift...
3α过程是宇宙核合成中最关键的反应之一，它控制着碳的合成，并作为通往更重元素的门户，塑造了宇宙中观测到的元素丰度[1-3]。三个α粒子通过中间态Be-8原子核产生C-12的共振态。稳定C-12的生成速率取决于共振态的衰变宽度。最为C-12最重要的共振态，霍伊尔态的衰变宽度已通过地面实验室得到了高精度测量，并用于计算三α反应率。
然而，强场核物理学的最新进展挑战了这种传统的核合成范式：恒星环境中的衰变宽度与自由空间中的衰变宽度相同吗？目前最先进的激光场强度可达10^23...
Previously, it was found that pion superfluidity could be realized in the quantum chromodynamics
(QCD) epoch of the early Universe, when lepton flavor asymmetry jle þ lμj is large enough to generate
a charge chemical potential jμQj larger than vacuum pion mass. By following the same logic, kaon
superfluidity might also be possible when jle þ lμj is so large that jμQj becomes larger than...
This study explores how α-clustering in light nuclei (e.g., 16O) and non-equilibrium dynamics shape quark-gluon plasma (QGP) signals in small collision systems (16O+16O, 20Ne+20Ne). Using the AMPT model, we simulate collisions at RHIC and LHC energies and show that α-clustering induces initial-state inhomogeneities that imprint distinct collective flow. Extended parton interaction times are...
The thermalization of the hot and dense QGP created in heavy-ion collisions is a crucial theoretical question in understanding the onset of hydrodynamics. One hypothesis to explain the rapid decrease in the degrees of freedom is the concept of a hydro attractor. In existing studies, the hydrodynamical solution shows the attractor behavior with respect to the proper time in Milne coordinate....
I will introduce some new developments in applying holographic methods to study the properties of QCD matter. These investigations encompass a wide range of topics, including the equation of state of QCD matter, conservation charge perturbations, jet energy loss, quantum entanglement, and other related phenomena. I will also discuss the characteristics of different holographic methods and...
In weak magnetic field approximation, quark distribution functions are modified linearly by electromagnetic tensor $F_{\mu\nu}$ in Quark Gluon Plasma(QGP). Quarks and anti-quarks tend to move perpendicular to the magnetic field. Hence, in the $q \bar{q}\rightarrow l \bar{l}$ process, momentum and angular momentum conservation will induce the dilepton anisotropy and the virtual photon...
The properties of QCD matter at finite isospin and strangeness densities are investigated employing holographic soft-wall AdS/QCD models. It is confirmed that at high enough isospin densities, charged pions start to condense and the pion superfluid phase appears in the system. It is shown that the chiral condensate and the pion condensate can be transformed to each other and form a `chiral...
