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Dileptons at Colliders as Probes of the Quark–Gluon Plasma 对撞机中的双轻子作为夸克-胶子等离子体的探测器
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-09-22 DOI: 10.1146/annurev-nucl-121423-100858
R. Bailhache, H. Appelshäuser
Ultrarelativistic heavy-ion collisions are used to create a deconfined state of quarks and gluons, the quark–gluon plasma (QGP), similar to the matter in the early Universe. Dileptons are a unique probe of the QGP. Being emitted during all stages of the collision without interacting strongly with the surrounding matter, they carry undistorted information about the medium evolution. The mass of the lepton–antilepton pair gives a unique means to separate partonic from hadronic radiation. Thus, dileptons can be used to study the QGP equilibration time, its average temperature, and effects related to the restoration of chiral symmetry in the hot medium via vector meson decays. This information is not accessible with hadrons. The price to pay is a large background from ordinary hadron decays. We summarize the potential of dilepton measurements, the results obtained so far at colliders, and the ongoing efforts regarding future experiments with further increased sensitivity.
超相对论性重离子碰撞被用来创造夸克和胶子的定义状态,即夸克-胶子等离子体(QGP),类似于早期宇宙中的物质。双轻子是QGP的独特探针。它们在碰撞的所有阶段都被发射出来,没有与周围物质发生强烈的相互作用,因此它们携带着关于介质演化的未被扭曲的信息。轻子-反轻子对的质量提供了一种独特的方法来分离部分子辐射和强子辐射。因此,双轻子可以用来研究QGP的平衡时间、平均温度以及通过矢量介子衰变在热介质中恢复手性对称性的相关效应。这个信息不能用强子获取。要付出的代价是普通强子衰变的大背景。我们总结了双轻子测量的潜力,迄今为止在对撞机上获得的结果,以及正在进行的关于进一步提高灵敏度的未来实验的努力。
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引用次数: 0
Detectors for Relativistic Nuclear Collisions 相对论性核碰撞探测器
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-09-22 DOI: 10.1146/annurev-nucl-102422-045821
Luciano Musa, Werner Riegler
Detectors for relativistic nuclear interactions have significantly increased in size and sophistication over the last few decades, primarily owing to rising collision energies and rates. Common across most particle physics experiments is the need to measure collision vertex, particle momentum, and particle energy. To accurately measure momenta at the very low level of 100 MeV/c, tracking detectors with a very low material budget are required. Additionally, particle identification requires detector systems that use time-of-flight, energy loss, and Cherenkov radiation measurements. Compared to high-luminosity proton–proton experiments, these detectors face considerably lower radiation levels, enabling the use of a wider range of sensor technologies and leading to innovative developments in this area. Technological advancements in data transport and processing over recent decades now enable continuous data readout and online processing, eliminating the need for selective triggering, which has significantly enhanced detector performance. This article provides an overview of current and future detectors for relativistic nuclear collisions along with a discussion of key technological advancements in this context. Given the similarity in detector requirements for future e + e Higgs factories, the conclusions drawn here are also relevant to developments in that domain.
在过去的几十年里,用于相对论性核相互作用的探测器在尺寸和复杂程度上都有了显著的增加,这主要是由于碰撞能量和速率的上升。大多数粒子物理实验都需要测量碰撞顶点、粒子动量和粒子能量。为了精确测量100 MeV/c的极低水平的动量,需要材料预算非常低的跟踪探测器。此外,粒子识别需要使用飞行时间、能量损失和切伦科夫辐射测量的探测器系统。与高亮度质子-质子实验相比,这些探测器面临的辐射水平要低得多,从而可以使用更广泛的传感器技术,并导致该领域的创新发展。近几十年来,数据传输和处理技术的进步使连续数据读出和在线处理成为可能,消除了选择性触发的需要,这大大提高了探测器的性能。本文概述了当前和未来的相对论性核碰撞探测器,并讨论了在这方面的关键技术进展。考虑到未来e + e−希格斯工厂的探测器需求的相似性,这里得出的结论也与该领域的发展有关。
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引用次数: 0
Long-Term Multidimensional Models of Core-Collapse Supernovae: Progress and Challenges 核心坍缩超新星的长期多维模型:进展与挑战
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-27 DOI: 10.1146/annurev-nucl-121423-100945
Hans-Thomas Janka
Self-consistent, multidimensional core-collapse (CC) supernova (SN) simulations, especially in three dimensions, have achieved tremendous progress over the past 10 years. They are now able to follow the entire evolution from CC through bounce, neutrino-triggered shock revival, and shock breakout at the stellar surface to the electromagnetic SN outburst and the subsequent SN remnant phase. Thus they provide general support for the neutrino-driven explosion mechanism by reproducing observed SN energies, neutron star (NS) kicks, and diagnostically relevant radioactive isotope yields. They also allow prediction of neutrino and gravitational wave signals for many seconds of proto-NS cooling, confirm correlations between explosion and progenitor or remnant properties already expected from previous spherically symmetric (one-dimensional) and two-dimensional models, and carve out various scenarios for stellar-mass black hole (BH) formation. Despite these successes, it is currently unclear which stars explode or form BHs because different modeling approaches disagree and suggest the possible importance of the three-dimensional nature of the progenitors and of magnetic fields. The role of neutrino flavor conversion in SN cores needs to be better understood, the nuclear equation of state (including potential phase transitions) implies major uncertainties, the SN 1987A neutrino measurements raise new puzzles, and tracing a possible correlation of NS spins and kicks requires still more refined SN simulations.
自洽、多维核坍缩(CC)超新星(SN)的模拟,特别是在三维空间的模拟,在过去10年中取得了巨大的进展。他们现在能够跟踪从CC到反弹,中微子触发的激波复苏,恒星表面的激波爆发,到电磁SN爆发和随后的SN残余阶段的整个演化过程。因此,他们通过再现观测到的SN能量、中子星(NS)踢动和诊断相关的放射性同位素产量,为中微子驱动爆炸机制提供了一般支持。它们还可以预测中微子和引力波信号在许多秒的原始ns冷却过程中,确认爆炸与祖先或残余属性之间的相关性,这些属性已经从以前的球对称(一维)和二维模型中得到了预测,并为恒星质量黑洞(BH)的形成创造了各种场景。尽管取得了这些成功,但目前尚不清楚哪些恒星会爆炸或形成黑洞,因为不同的建模方法不一致,并且表明了祖恒星和磁场的三维性质可能的重要性。中微子风味转换在SN核中的作用需要更好地理解,核状态方程(包括潜在的相变)意味着主要的不确定性,SN 1987A中微子测量提出了新的难题,追踪NS自旋和踢动的可能相关性需要更精细的SN模拟。
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引用次数: 0
Progress of the Jinping Underground Nuclear Astrophysics ( JUNA) Experimental Platform
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-26 DOI: 10.1146/annurev-nucl-121423-101021
Weiping Liu, Bing Guo, Jianjun He, Zhihong Li, Xiaodong Tang, Maria Lugaro, Gang Lian
This article reviews the development and achievements of the Jinping Underground Nuclear Astrophysics ( JUNA) experimental platform and focuses on the direct measurement of reaction rates inside or near the Gamow window in deep-underground astrophysical experiments. It discusses the advantages of conducting experiments in the deep-underground environment of the China Jinping Underground Laboratory (CJPL), which provides significant shielding from cosmic rays along with milliampere-level intensity from the JUNA accelerator. This shielding and high intensity are crucial for accurately measuring very-low-cross-section nuclear reactions essential to understanding astrophysical processes, such as the synthesis of heavy elements in stars from neutron sources and CNO cycle leakage. The manuscript also covers technological achievements, including advancements in ion sources, accelerators, detectors, and targets used in the JUNA experiment. The physics results from these experiments provide valuable data for key reactions, such as neutron source reactions and radiative capture reactions, as well as for the production of heavy elements in early stars. Future plans for the JUNA experiment are also outlined.
​​这种屏蔽和高强度对于精确测量非常低截面的核反应至关重要,这对于理解天体物理过程至关重要,例如从中子源合成恒星中的重元素和CNO循环泄漏。该手稿还涵盖了技术成就,包括离子源、加速器、探测器和JUNA实验中使用的目标的进展。这些实验的物理结果为关键反应提供了有价值的数据,如中子源反应和辐射捕获反应,以及早期恒星中重元素的产生。JUNA实验的未来计划也被概述。
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引用次数: 0
Neutrino Oscillations in Core-Collapse Supernovae and Neutron Star Mergers 核心坍缩超新星和中子星合并中的中微子振荡
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-26 DOI: 10.1146/annurev-nucl-121423-100853
Lucas Johns, Sherwood Richers, Meng-Ru Wu
Accurate neutrino transport is crucial for reliably modeling explosive astrophysical events like core-collapse supernovae (CCSNe) and neutron star mergers (NSMs). However, in these extremely neutrino-dense systems, flavor oscillations exhibit challenging nonlinear effects rooted in neutrino–neutrino forward scattering. Evidence is quickly accumulating that these collective phenomena can substantially affect explosion dynamics, neutrino and gravitational-wave signals, nucleosynthesis, and kilonova light curves. We review the progress made so far on the difficult and conceptually deep question of how to correctly include this physics in simulations of CCSNe and NSMs. Our aim is to take a broad view of where the problem stands and provide a critical assessment of where it is headed.
精确的中微子输运对于可靠地模拟核心坍缩超新星(CCSNe)和中子星合并(nsm)等爆炸性天体物理事件至关重要。然而,在这些中微子密度极高的系统中,风味振荡表现出具有挑战性的非线性效应,其根源在于中微子-中微子前向散射。证据正在迅速积累,这些集体现象可以实质性地影响爆炸动力学、中微子和引力波信号、核合成和千新星光曲线。我们回顾了迄今为止在如何在CCSNe和nsm的模拟中正确地包含这种物理的困难和概念上深刻的问题上取得的进展。我们的目标是对问题的现状有一个广泛的看法,并对问题的发展方向提供一个批判性的评估。
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引用次数: 0
Lattice QCD and the Neutron Electric Dipole Moment 点阵QCD与中子电偶极矩
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-26 DOI: 10.1146/annurev-nucl-121423-100927
Keh-Fei Liu
The recent lattice QCD calculations of the neutron and proton electric dipole moments and the CP-violating πNN coupling constant due to the θ term are reviewed. Progress toward nucleon electric dipole moment calculations, including the Weinberg three-gluon operator, the quark chromoelectric dipole moment operator, and their renormalization, is also discussed.
综述了近年来中子和质子电偶极矩的点阵QCD计算以及由于θ项而产生的违反π - nn耦合常数。讨论了核子电偶极矩计算的进展,包括温伯格三胶子算子、夸克色电偶极矩算子及其重整化。
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引用次数: 0
Soft QCD Physics at the LHC: Highlights and Opportunities 大型强子对撞机的软QCD物理:亮点与机遇
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-25 DOI: 10.1146/annurev-nucl-121423-101050
P. Christiansen, P. Van Mechelen
The Large Hadron Collider (LHC) at CERN became operational in 2009 and has since then produced a plethora of physics results from proton–proton ( pp) collisions. This short review covers results that relate to soft quantum chromodynamics (QCD) with a focus on nondiffractive physics at midrapidity. Most of the presented results are based on transverse momentum spectra and related derived observables, including multiplicity, the average transverse momentum, and various particle ratios. Additionally, the phenomenon of the observed ridge and its potential connection to the formation of a quark–gluon plasma in pp collisions are discussed. The goals of the review are to introduce the topics and provide references for scientists joining the LHC program and to highlight what we consider to be the most interesting results and open questions, to inspire novel measurements.
欧洲核子研究中心(CERN)的大型强子对撞机(LHC)于2009年投入运行,从那时起,质子-质子(pp)碰撞产生了大量的物理结果。这篇简短的综述涵盖了与软量子色动力学(QCD)有关的结果,重点是在中速下的非衍射物理。所提出的大多数结果都是基于横向动量谱和相关的推导观测值,包括多重性、平均横向动量和各种粒子比。此外,还讨论了观察到的脊现象及其与pp碰撞中夸克-胶子等离子体形成的潜在联系。回顾的目的是介绍主题,为加入LHC项目的科学家提供参考,并强调我们认为最有趣的结果和开放的问题,以激发新的测量方法。
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引用次数: 0
Quarkonia and Deconfined Quark–Gluon Matter in Heavy-Ion Collisions 重离子碰撞中的夸克和非限定夸克-胶子物质
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-25 DOI: 10.1146/annurev-nucl-121423-101041
Anton Andronic, Roberta Arnaldi
In this article, we present an experimental overview of quarkonium results obtained in nucleus–nucleus collisions with a focus on the data collected at the LHC. We discuss the current understanding of charmonium and bottomonium behavior in the deconfined medium produced in such collisions, and we compare the currently accessible observables with predictions from state-of-the-art theoretical models. We also discuss the open questions and explain how future heavy-ion experiments aim to clarify these aspects.
在这篇文章中,我们介绍了在核-核碰撞中获得的夸克子结果的实验概述,重点是在大型强子对撞机上收集的数据。我们讨论了目前对在这种碰撞中产生的定义介质中的调和铵和底铵行为的理解,并将目前可获得的观测结果与最先进的理论模型的预测进行了比较。我们还讨论了悬而未决的问题,并解释了未来的重离子实验如何旨在澄清这些方面。
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引用次数: 0
Low-Energy Backgrounds in Solid-State Phonon and Charge Detectors 固体声子和电荷探测器中的低能量背景
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-24 DOI: 10.1146/annurev-nucl-121423-100849
Daniel Baxter, Rouven Essig, Yonit Hochberg, Margarita Kaznacheeva, Belina von Krosigk, Florian Reindl, Roger K. Romani, Felix Wagner
Solid-state phonon and charge detectors probe the scattering of weakly interacting particles, such as dark matter and neutrinos, through their low recoil thresholds. Recent advancements have pushed sensitivity to eV-scale energy depositions, uncovering previously unseen low-energy excess backgrounds. While some arise from known processes such as thermal radiation, luminescence, and stress, others remain unexplained. This review examines these backgrounds, their possible origins, and parallels to low-energy effects in solids, an understanding of which is essential for interpreting particle interactions at and below the eV scale.
固体声子和电荷探测器探测弱相互作用粒子的散射,如暗物质和中微子,通过它们的低反冲阈值。最近的进展提高了对电动汽车规模能量沉积的敏感性,发现了以前未见过的低能量过剩背景。虽然有些是由已知的过程引起的,如热辐射、发光和应力,但其他的仍然无法解释。这篇综述考察了这些背景,它们可能的起源,以及与固体中低能量效应的相似之处,理解这些对于解释eV尺度和eV尺度以下的粒子相互作用至关重要。
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引用次数: 0
Vision for High-Energy-Frontier Particle Colliders in China 中国高能前沿粒子对撞机的展望
IF 12.4 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2025-06-24 DOI: 10.1146/annurev-nucl-121423-101120
Jie Gao, Dou Wang, Yifang Wang
The discovery of the Higgs boson at the Large Hadron Collider has opened the door to a new realm of physics, where high-energy accelerators are essential to explore more fundamental laws. In this article, we share our vision regarding the future of high-energy physics and accelerators, particularly focusing on the Circular Electron Positron Collider (CEPC) and Super Proton-Proton Collider (SPPC) projects proposed by Chinese scientists in September 2012. Following the recent completion of the CEPC accelerator's technical design report, we review its main physics drives, technical design, and related technology development. The construction of the CEPC will become technologically viable upon the completion of its engineering design report, expected in approximately 3 years. Efforts are also underway to advance technologies for the SPPC.
希格斯玻色子在大型强子对撞机上的发现打开了通往物理学新领域的大门,高能加速器对于探索更基本的定律至关重要。在这篇文章中,我们分享了我们对高能物理和加速器的未来的看法,特别是关注中国科学家在2012年9月提出的环形电子正电子对撞机(CEPC)和超级质子质子对撞机(SPPC)项目。在最近完成CEPC加速器的技术设计报告后,我们回顾了它的主要物理驱动器、技术设计和相关技术开发。在完成工程设计报告后(预计约3年),CEPC的建设将在技术上可行。推进SPPC技术的努力也在进行中。
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引用次数: 0
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Annual Review of Nuclear and Particle Science
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