高能物理 - 实验
查看 最近的 文章
显示 2025年11月19日， 星期三 新的列表
- [1] arXiv:2511.14384 [中文pdf, pdf, html, 其他]
-
标题： $CP$不对称性的修正在$Υ(4S)$衰变中由于$B^0 \bar B^0$在$C$偶态中的混合标题： Correction to $CP$-asymmetry in $Υ(4S)$ decays due to the admixture of $B^0 \bar B^0$ in a $C$-even stateK. Aggarwal, I. Arnquist, N. Avalos, X. Bertou, N. Castello-Mor, C. Centeno-Lorca, A.E. Chavarria, J. Cuevas-Zepeda, A. Dastgheibi-Fard, C. De Dominicis, O. Deligny, J. Duarte-Campderros, E. Estrada, R. Gaior, E.-L. Gkougkousis, T. Hossbach, L. Iddir, B. J. Kavanagh, B. Kilminster, I. Lawson, A. Letessier-Selvon, H. Lin, P. Loaiza, A. Lopez-Virto, R. Lou, H. Lumengo-Kidimbu, K. J. McGuire, S. Munagavalasa, J. Noonan, 6 D. Norcini, S. Paul, P. Privitera, P. Robmann, B. Roach, D. Rosenmerkel, M. Settimo, R. Smida, M. Traina, R. Vilar, R. Yajur, D. Venegas-Vargas, C. Zhu, Y. Zhu (DAMIC-M Collaboration)评论： 8页，2图主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex)
$BB$对来自$Υ(4S)\to BB$衰变的态处于$C$奇态。 然而，存在少量的$C$偶态成分，并且它会改变时间依赖的$CP$不对称性。 $C$偶态成分是由于软光子辐射产生的，这破坏了初始态纯$C$奇态的性质。 使用双粒子波函数形式，我们推导出纯和混合$C$-宇称态中$CP$-不对称性的解析表达式。 我们强调混入幅度的强能量依赖性。
$BB$ pairs from $Υ(4S)\to BB$ decays are in $C$-odd state. However, there is a small admixture of the $C$-even state and it modifies the time dependent $CP$-asymmetry. The $C$-even component appears due to soft photon emission, breaking the pure $C$-odd nature of the initial state. Using the two-particle wave function formalism, we derive analytical expressions for $CP$-asymmetry in both pure and mixed $C$-parity states. We emphasize the strong energy dependence of the admixture magnitude.
- [2] arXiv:2511.13997 [中文pdf, pdf, html, 其他]
-
标题： 轻锥横向核子电荷和磁化密度标题： Light-Front Transverse Nucleon Charge and Magnetisation DensitiesDenis Bodrov, Xinping Xu, Dmitrii Gavrilov, Pavel Pakhlov, Valerio Bertacchi, Tadeas Bilka, Arkodip Biswas, Giulia Casarosa, Priyanka Cheema, Luigi Corona, Giacomo De Pietro, Thanh V. Dong, Patrick Ecker, Torben Ferber, Romulus Godang, Alexander Heidelbach, Tommy Lam, Martina Laurenza, Thomas Lueck, Ludovico Massaccesi, Frank Meier, Lea Reuter, Bianca Scavino, Karin Schoenning, Justin Skorupa, Stefano Spataro, Tien Manh Tran, Vidya Vobbilisetti, Christian Wessel, Jaroslaw Wiechczynski评论： 14页，10图，2表主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex) ; 高能物理 - 格点 (hep-lat) ; 核实验 (nucl-ex) ; 核理论 (nucl-th)
使用核子结构的三体和夸克加完全相互作用二夸克两种图片获得的核子弹性电磁形式因子被用于计算质子和中子及其裸价夸克组分的一系列轻锥横向密度，即： 质子和中子的味分离结果。 这两种互补的核子结构描述给出了相互兼容的预测，这些预测与基于现有数据的现代参数化结果一致，当这些数据存在时。 其中，发现横向平面上的价$u$-和$d$-夸克狄拉克半径几乎无法区分；但对于同类泡利半径，$d$夸克的值比$u$-夸克的大约10%。 此外，从磁性角度看，价$d$夸克比价$u$夸克活跃得多，可能是因为它具有更大的轨道角动量。 两种核子结构图片在预测极化核子中横向平面上的电荷密度不再具有旋转不变性方面达成一致。 相反，对于一个$+\hat x$极化的核子，正电荷在$-\hat y$方向发生位移，负电荷则产生相反的效果。
Nucleon elastic electromagnetic form factors obtained using both the three-body and quark + fully-interacting-diquark pictures of nucleon structure are employed to calculate an array of light-front transverse densities for the proton and neutron and their dressed valence-quark constituents, viz. flavour separations of the proton and neutron results. These two complementary descriptions of nucleon structure deliver mutually compatible predictions, which match expectations based on modern parametrisations of available data, where such are available. Amongst other things, it is found that transverse-plane valence $u$- and $d$-quark Dirac radii are practically indistinguishable; but regarding kindred Pauli radii, the $d$ quark value is roughly 10% greater than that of the $u$-quark. Moreover, magnetically, the valence $d$ quark is far more active than the valence $u$ quark, probably because it has much greater orbital angular momentum. Both pictures of nucleon structure agree in predicting that, in a polarised nucleon, the transverse-plane charge densities are no longer rotationally invariant. Instead, for a $+\hat x$ polarised nucleon, positive charge is displaced in the $-\hat y$ direction, with the opposite effect for negative charge.
- [3] arXiv:2511.14583 [中文pdf, pdf, html, 其他]
-
标题： 在质子-质子碰撞中寻找重H$γ$和Z$γ$共振，在最终态中有底夸克-反底夸克对，碰撞能量为$\sqrt{s}$ = 13 TeV标题： Search for heavy H$γ$ and Z$γ$ resonances with a bottom quark-antiquark pair in the final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV评论： 提交至《科学通报》。所有图表均可在 http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-24-007（CMS 公共页面）找到。主题： 高能物理 - 实验 (hep-ex)
寻找衰变为希格斯玻色子(H)或Z玻色子和光子($γ$)的重共振态，其中H或Z玻色子衰变为底夸克-反底夸克对($\mathrm{b\bar{b}}$)，本文进行了研究。 分析使用了在$\sqrt{s}$=13 TeV下由CMS实验在CERN大型强子对撞机上收集的质子-质子碰撞数据，对应的积分亮度为138 fb$^{-1}$。 分析事件包含一个光子和一个来自洛伦兹增强的$\mathrm{b\bar{b}}$系统的高质量大半径喷注。 一种基于变压器的先进算法根据喷注的子结构和夸克类型对其进行分类，形成一个标记器，用于识别来自H/Z$\to$ $\mathrm{b\bar{b}}$ 衰变的喷注。 一组参数函数用于拟合光子-喷注不变质量谱，并提取潜在信号。 在标准模型预期之上未观察到显著过量。 结果在95%置信水平上对自旋-1 H$γ$谐振子的截面与分支比的乘积以及自旋-0 Z$γ$谐振子的截面与分支比的乘积设定了上限，分别低于0.1和0.3 fb，代表目前最严格的限制。
A search for heavy resonances decaying into a Higgs boson (H) or a Z boson and a photon ($γ$), with the H or Z bosons decaying to a bottom quark-antiquark pair ($\mathrm{b\bar{b}}$) is presented. The analysis is performed using proton-proton collision data at $\sqrt{s}$ = 13 TeV collected by the CMS experiment at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 138 fb$^{-1}$. The analyzed events contain a photon and a massive large-radius jet originating from a Lorentz-boosted $\mathrm{b\bar{b}}$ system. An advanced transformer-based algorithm classifies jets according to their substructure and quark flavors, forming a tagger that identifies jets as candidates from H/Z $\to$ $\mathrm{b\bar{b}}$ decays. A set of parametric functions is used to fit the photon-jet invariant mass spectrum and to extract potential signals. No significant excess is observed above the standard model expectations. The results set upper limits at 95% confidence level on the product of the cross section and the branching fraction for spin-1 H$γ$ resonances and spin-0 Z$γ$ resonances, below 0.1 and 0.3 fb, respectively, representing the most stringent limits to date.
- [4] arXiv:2511.14095 [中文pdf, pdf, html, 其他]
-
标题： 研究从激光和测试束测量中得到的AC-LGAD条形传感器标题： Studying AC-LGAD strip sensors from laser and testbeam measurementsAngel Abusleme, Thomas Adam, Kai Adamowicz, David Adey, Shakeel Ahmad, Rizwan Ahmed, Timo Ahola, Sebastiano Aiello, Fengpeng An, Guangpeng An, Costas Andreopoulos, Giuseppe Andronico, João Pedro Athayde Marcondes de André, Nikolay Anfimov, Vito Antonelli, Tatiana Antoshkina, Burin Asavapibhop, Didier Auguste, Margherita Buizza Avanzini, Andrej Babic, Jingzhi Bai, Weidong Bai, Nikita Balashov, Roberto Barbera, Andrea Barresi, Davide Basilico, Eric Baussan, Beatrice Bellantonio, Marco Bellato, JeanLuc Beney, Marco Beretta, Antonio Bergnoli, Enrico Bernieri, Nikita Bessonov, David Biaré, Daniel Bick, Lukas Bieger, Svetlana Biktemerova, Thilo Birkenfeld, David Blum, Simon Blyth, Sara Boarin, Manuel Boehles, Anastasia Bolshakova, Mathieu Bongrand, Aurélie Bonhomme, Clément Bordereau, Matteo Borghesi, Augusto Brigatti, Timothee Brugiere, Riccardo Brugnera, Riccardo Bruno, Jonas Buchholz, Antonio Budano, Max Buesken, Mario Buscemi, Severino Bussino, Jose Busto, Ilya Butorov, Marcel Büchner, Anatael Cabrera, Barbara Caccianiga, Boshuai Cai, Hao Cai, Xiao Cai, Yanke Cai, Yi-zhou Cai, Zhiyan Cai, Stéphane Callier, Steven Calvez, Antonio Cammi, Agustin Campeny, Dechang Cai, Chuanya Cao, Dewen Cao, Guofu Cao, Jun Cao, Yaoqi Cao, Rossella Caruso, Aurelio Caslini, Cédric Cerna, Vanessa Cerrone, Daniele Cesini, Chi Chan, Jinfan Chang, Yun Chang, Milo Charavet, Tim Charissé, Auttakit Chatrabhuti, Chao Chen, Guoming Chen, Haitao Chen, Haotian Chen, Jiahui Chen, Jian Chen, Jing Chen, Junyou Chen, Lihao Chen, Mali Chen, Mingming Chen主题： 仪器与探测器 (physics.ins-det) ; 高能物理 - 实验 (hep-ex)
本文介绍了用于表征和测量交流耦合低增益雪崩二极管（AC-LGADs）的空间和时间分辨率的装置，使用1060纳米激光源以定义明确的校准方法来沉积初始电荷。 结果与使用120 GeV质子束获得的结果进行了比较。 尽管激光和质子束在电荷沉积机制上存在差异，但在校准后，两种源的空间和时间分辨率被发现是兼容的。 随着四维跟踪探测器预计将在即将进行的对撞机实验中发挥重要作用，我们认为这项工作可以作为评估半导体传感器性能的一种方式，这些传感器可以增强测试束测量并加速R$\&$D工作。 此外，使用Silvaco TCAD和Weightfield2进行了模拟研究，以了解AC-LGAD传感器中总时间分辨率的各种影响因素，这些因素是通过激光源测量的。
This paper presents the setup assembled to characterize and measure the spatial and timing resolutions of AC-coupled Low Gain Avalanche Diodes (AC-LGADs), using a 1060 nm laser source to deposit initial charges with a defined calibration methodology. The results were compared to those obtained with a 120 GeV proton beam. Despite the differences in the charge deposition mechanism between the laser and proton beam, the spatial and temporal resolutions were found to be compatible between the two sources after calibration. With 4D tracking detectors expected to play a vital role in upcoming collider experiments, we foresee this work as a way to evaluate the performance of semiconductor sensors that can augment testbeam measurements and accelerate R$\&$D efforts. Additionally, simulation studies using Silvaco TCAD and Weightfield2 were carried out to understand the various contributing factors to the total time resolution in AC-LGAD sensors, measured using the laser source.
- [5] arXiv:2511.14605 [中文pdf, pdf, html, 其他]
-
标题： CsI(Tl) 闪烁体与 SiPM 在低温下的耦合特性分析标题： Characterization of a CsI(Tl) Scintillator Coupled to a SiPM at Cryogenic TemperaturesAngel Abusleme, Thomas Adam, Kai Adamowicz, David Adey, Shakeel Ahmad, Rizwan Ahmed, Timo Ahola, Sebastiano Aiello, Fengpeng An, Guangpeng An, Costas Andreopoulos, Giuseppe Andronico, João Pedro Athayde Marcondes de André, Nikolay Anfimov, Vito Antonelli, Tatiana Antoshkina, Burin Asavapibhop, Didier Auguste, Margherita Buizza Avanzini, Andrej Babic, Jingzhi Bai, Weidong Bai, Nikita Balashov, Roberto Barbera, Andrea Barresi, Davide Basilico, Eric Baussan, Beatrice Bellantonio, Marco Bellato, JeanLuc Beney, Marco Beretta, Antonio Bergnoli, Enrico Bernieri, Nikita Bessonov, David Biaré, Daniel Bick, Lukas Bieger, Svetlana Biktemerova, Thilo Birkenfeld, David Blum, Simon Blyth, Sara Boarin, Manuel Boehles, Anastasia Bolshakova, Mathieu Bongrand, Aurélie Bonhomme, Clément Bordereau, Matteo Borghesi, Augusto Brigatti, Timothee Brugiere, Riccardo Brugnera, Riccardo Bruno, Jonas Buchholz, Antonio Budano, Max Buesken, Mario Buscemi, Severino Bussino, Jose Busto, Ilya Butorov, Marcel Büchner, Anatael Cabrera, Barbara Caccianiga, Boshuai Cai, Hao Cai, Xiao Cai, Yanke Cai, Yi-zhou Cai, Zhiyan Cai, Stéphane Callier, Steven Calvez, Antonio Cammi, Agustin Campeny, Dechang Cai, Chuanya Cao, Dewen Cao, Guofu Cao, Jun Cao, Yaoqi Cao, Rossella Caruso, Aurelio Caslini, Cédric Cerna, Vanessa Cerrone, Daniele Cesini, Chi Chan, Jinfan Chang, Yun Chang, Milo Charavet, Tim Charissé, Auttakit Chatrabhuti, Chao Chen, Guoming Chen, Haitao Chen, Haotian Chen, Jiahui Chen, Jian Chen, Jing Chen, Junyou Chen, Lihao Chen, Mali Chen, Mingming Chen主题： 仪器与探测器 (physics.ins-det) ; 高能物理 - 实验 (hep-ex)
我们报告了将1 cm^3 CsI(Tl)晶体耦合到6 x 6 mm^2 SiPM，并在低温下使用定制跨阻放大器进行读出的闪烁特性。该晶体具有光学级表面，并封装在多层屏蔽系统中以抑制环境光和背景辐射。探测器响应在100 K至室温的温度范围内进行了研究。一个定义为59.5 keV峰位置与基线分辨率之比的优值在175 K时达到最大值，表明光子探测效率最佳。脉冲形状分析显示闪烁衰减存在温度依赖性变化。在175 K时，基线分辨率为sigma ~ 1 keV，对应的有效阈值约为3 keV。这些结果证实了CsI(Tl) SiPM系统在稀有事件搜索和低能粒子检测中实现低阈值运行的能力。
We report on the scintillation characterization of a 1 cm^3 CsI(Tl) crystal coupled to a 6 x 6 mm^2 SiPM read out with a custom transimpedance amplifier at cryogenic temperatures. The crystal was prepared with optical-grade surfaces and enclosed in a multi layer shielding system to suppress ambient light and background radiation. The detector response was studied at temperatures ranging from 100 K to room temperature. A figure of merit, defined as the ratio of the 59.5 keV peak position to the baseline resolution, showed a maximum at 175 K, indicating optimal photon detection efficiency. Pulse shape analysis demonstrated temperature-dependent variations in scintillation decay. At 175 K, the baseline resolution was sigma ~ 1 keV, corresponding to an effective threshold of ~ 3 keV. These results confirm the capability of the CsI(Tl) SiPM system to operate at low thresholds for rare-event searches and low-energy particle detection.
新提交 (展示 5 之 5 条目 )
- [6] arXiv:2511.14593 (交叉列表自 hep-ex) [中文pdf, pdf, html, 其他]
-
标题： JUNO反应堆中微子振荡的首次测量标题： First measurement of reactor neutrino oscillations at JUNO评论： 30页，11图主题： 高能物理 - 实验 (hep-ex)
中微子振荡是一种在宏观尺度上表现出来的量子效应，由轻子味混合角和中微子质量平方差所支配，这些是粒子物理的基本参数，代表了超出标准模型的现象。对这些参数的精确测量对于测试三味框架的完整性、确定中微子的质量顺序以及探索可能的新物理现象至关重要。江门地下中微子观测站（JUNO）是一个20千吨的液态闪烁体探测器，位于多个反应堆核心52.5公里处，旨在以百分之一以下的精度解析反应堆中微子的干涉图样。在这里，我们报告了自2025年8月探测器完成以来收集的前59.1天数据，首次同时高精度确定了正常质量顺序情景下的两个中微子振荡参数，$\sin^2 θ_{12} = 0.3092\,\pm\,0.0087$和$Δm^2_{21} = (7.50\,\pm\,0.12)\times10^{-5}\;{\rm eV}^2$，与所有先前测量的组合相比，精度提高了1.6倍。这些结果推进了对中微子的基本理解，验证了探测器的设计，并确认了JUNO为解决中微子质量顺序做好了准备。在短曝光下迅速取得的成果突显了JUNO在推动精密中微子物理前沿方面的潜力，并为其广泛的科学计划铺平了道路。
Neutrino oscillations, a quantum effect manifesting at macroscopic scales, are governed by lepton flavor mixing angles and neutrino mass-squared differences that are fundamental parameters of particle physics, representing phenomena beyond the Standard Model. Precision measurements of these parameters are essential for testing the completeness of the three-flavor framework, determining the mass ordering of neutrinos, and probing possible new physics. The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid-scintillator detector located 52.5 km from multiple reactor cores, designed to resolve the interference pattern of reactor neutrinos with sub-percent precision. Here we report, using the first 59.1 days of data collected since detector completion in August 2025, the first simultaneous high-precision determination of two neutrino oscillation parameters, $\sin^2 θ_{12} = 0.3092\,\pm\,0.0087$ and $Δm^2_{21} = (7.50\,\pm\,0.12)\times10^{-5}\;{\rm eV}^2$ for the normal mass ordering scenario, improving the precision by a factor of 1.6 relative to the combination of all previous measurements. These results advance the basic understanding of neutrinos, validate the detector's design, and confirm JUNO's readiness for its primary goal of resolving the neutrino mass ordering with a larger dataset. The rapid achievement with a short exposure highlights JUNO's potential to push the frontiers of precision neutrino physics and paves the way for its broad scientific program.
- [7] arXiv:2504.03559 (交叉列表自 hep-ph) [中文pdf, pdf, html, 其他]
-
标题： 在CDEX-10实验中，有效场论框架下由超新星激波增强的暗物质约束标题： Constraints on dark matter boosted by supernova shock within the effective field theory framework from the CDEX-10 experiment评论： 9页，5图。版本已更新以匹配PRD版本期刊参考： 物理评论D 112, 092011 (2025)主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex) ; 仪器与探测器 (physics.ins-det)
超新星冲击可以将暗物质（DM）粒子加速到高但非相对论性的速度，在非相对论有效场理论（NREFT）的框架内提供一种合适的分析机制。 这些加速的DM源扩展了实验能力，使轻量级DM的参数空间扫描进入亚吉电子伏区域。 在本研究中，我们特别分析由Monogem环超新星遗迹加速的DM，其年龄（$\sim 68000$yr）和距离地球的距离（$\sim 300$parsec）被战略性地匹配，以使当前地面探测器能够检测到。 利用从中国锦屏地下实验室的CDEX-10实验获得的205.4 kg$\cdot$day数据，我们在NREFT框架内得出了对增强DM的新限制。 现在NREFT耦合常数排除区域渗透到亚吉电子伏质量范围，在0.4--0.6 GeV质量范围内，对于算符$\mathcal{O}_{3}$、$\mathcal{O}_{6}$、$\mathcal{O}_{15}$达到最佳灵敏度。
Supernova shocks can boost dark matter (DM) particles to high, yet nonrelativistic, velocities, providing a suitable mechanism for analysis within the framework of the nonrelativistic effective field theory (NREFT). These accelerated DM sources extend the experimental ability to scan the parameter space of light DM into the sub-GeV region. In this study, we specifically analyze DM accelerated by the Monogem Ring supernova remnant, whose age ($\sim 68000$ yr) and distance to Earth ($\sim 300$ parsec) are strategically matched to enable detection with current terrestrial detectors. Utilizing the 205.4 kg$\cdot$day data obtained from the CDEX-10 experiment at the China Jinping Underground Laboratory, we derive new constraints on boosted DM within the NREFT framework. The NREFT coupling constant exclusion regions now penetrate the sub-GeV mass range, with optimal sensitivity achieved for operators $\mathcal{O}_{3}$, $\mathcal{O}_{6}$, $\mathcal{O}_{15}$ in the 0.4--0.6 GeV mass range.
- [8] arXiv:2511.11856 (交叉列表自 hep-ex) [中文pdf, pdf, html, 其他]
-
标题： SNO+中1.46千吨年数据的反应堆反中微子振荡测量标题： Measurement of reactor antineutrino oscillations with 1.46 ktonne-years of data at SNO+主题： 高能物理 - 实验 (hep-ex)
SNO+合作组报告了利用2022年5月至2025年7月获取的数据对反应堆反中微子振荡的新结果。 在240、350和355公里处由核反应堆主导的通量的谱分析得出质量平方差$Δm^2_{21}=(7.93^{+0.21}_{-0.24})\times 10^{-5}$ eV$^2$。 该结果与唯一的其他长基线反应堆反中微子测量结果——KamLAND的结果相容，并接近其精度。 结合这些测量结果以及太阳中微子实验的结果，中微子混合参数的全球值变为：$Δm^2_{21}$ = $(7.63\pm0.17)\times 10^{-5}$ eV$^2$以及$\sin^2{θ_{12}}=0.310\pm0.012$。 SNO+对地中微子的分析也得到了改进，测得的信号为49$^{+13}_{-12}$ TNU。
The SNO+ Collaboration reports new results on reactor antineutrino oscillations using data acquired from May 2022 through July 2025. The spectral analysis of a flux dominated by nuclear reactors at 240, 350, and 355 kilometers yields the mass-squared difference $Δm^2_{21}=(7.93^{+0.21}_{-0.24})\times 10^{-5}$ eV$^2$. This result is compatible with and approaches the precision of the only other long-baseline reactor antineutrino measurement, by KamLAND. Combining these measurements, along with those from solar neutrino experiments, the global values of the neutrino mixing parameters become: $Δm^2_{21}$ = $(7.63\pm0.17)\times 10^{-5}$ eV$^2$ and $\sin^2{θ_{12}}=0.310\pm0.012$. The analysis of geoneutrinos at SNO+ is also improved, with a measured signal of 49$^{+13}_{-12}$ TNU.
- [9] arXiv:2511.07358 (交叉列表自 nucl-ex) [中文pdf, pdf, html, 其他]
-
标题： 相对论重离子碰撞中的手征磁效应实验综述标题： Experimental review on the chiral magnetic effect in relativistic heavy ion collisions评论： 27页，12张图。欧洲物理期刊特刊《探索致密核物质》的特邀综述，客座编辑：Subhasis Chattopadhyay，Peter Senger主题： 核实验 (nucl-ex) ; 高能物理 - 实验 (hep-ex) ; 高能物理 - 现象学 (hep-ph) ; 核理论 (nucl-th)
手征磁效应（CME）是指在量子色动力学中预测的一种现象，表现为沿外部磁场方向的电荷分离，这是由夸克手征性的不平衡所驱动的。 已经通过相对论重离子碰撞中的方位粒子关联进行了CME的搜索，在这种情况下预期存在手征性不平衡，并且在初始阶段产生了强磁场。 由于方位相关观测量受到大的背景贡献影响，到目前为止还没有建立关于CME的明确实验证据。 我们回顾了CME实验搜索的现状，涵盖了使用的观测量、减轻背景的技术以及各种实验方法的优缺点，并概述了高能核碰撞中CME搜索的未来前景。
The chiral magnetic effect (CME) refers to a predicted phenomena in quantum chromodynamics that manifests as a charge separation along an external magnetic field, driven by an imbalance of quark chirality. Searches for the CME has been carried out by azimuthal particle correlations in relativistic heavy ion collisions where such a chirality imbalance is anticipated and a strong magnetic field is created in the initial stage. No conclusive experimental evidence on the CME has been established so far because of large background contributions to azimuthal correlation observables. We review the status of the experimental search for the CME, covering the observables used, the techniques to mitigate backgrounds, and the strengths and limitations of various experimental approaches, and outline a future prospect of the CME search in high-energy nuclear collisions.
- [10] arXiv:2511.13943 (交叉列表自 hep-th) [中文pdf, pdf, html, 其他]
-
标题： 红外量子电动力学和瑞利-金斯物理标题： Infrared Quantum Electrodynamics and the Rayleigh-Jeans Physics评论： 16页，1图主题： 高能物理 - 理论 (hep-th) ; 宇宙学与非星系天体物理学 (astro-ph.CO) ; 高能物理 - 现象学 (hep-ph)
红外量子电动力学（IR-QED）在软光子被描述为绝热传输的电子-光子云时，获得了自然的几何解释。 在这个框架中，相关的红外结构被编码在一个与规范连接空间相关的功能贝里相位中，相应的贝里修正改变了瑞利-金斯谱。 瑞利-金斯定律的红外标度对称性导致了一个简单的重整化群方程，其解确定了有效因子$F_{\rm eff}(ω)$的频率依赖性，该因子控制电子-光子云的强度。 因此，宇宙微波背景（CMB）的能量密度会受到一个按幂律变化的贝里诱导修正，并在射频领域产生频率相关的温度过量。 尽管支配这种标度行为的指数$γ$不能由当前 IR-QED 的表述内部确定，而必须通过现象学方法确定，但过量的存在和结构是该理论的真实预测。 值得注意的是，所得表达式非常简单，并自然地与 ARCADE 2 数据所建议的偏差一致。 综合来看，这些结果表明，IR-QED 中的贝里相位可能导致 CMB 谱低频尾部的可观测后果。
Infrared quantum electrodynamics (IR-QED) acquires a natural geometric interpretation once soft photons are described as adiabatically transported electron-photon clouds. Within this framework, the relevant infrared structure is encoded in a functional Berry phase associated with the space of gauge connections, and the corresponding Berry corrections modify the Rayleigh-Jeans spectrum. The infrared scaling symmetry of the Rayleigh-Jeans law leads to a simple renormalization-group equation whose solution determines the frequency dependence of an effective factor $F_{\rm eff}(ω)$ controlling the strength of the electron-photon cloud dressing. As a result, the energy density of the cosmic microwave background (CMB) receives a Berry-induced correction that scales as a power law and produces a frequency-dependent temperature excess in the radio domain. Although the exponent $γ$ governing this scaling behaviour is not fixed internally by the present formulation of IR-QED and must instead be determined phenomenologically, the existence and structure of the excess are genuine predictions of the theory. Remarkably, the resulting expression is extremely simple and naturally aligns with the deviations suggested by the ARCADE 2 data. Taken together, these results indicate that Berry phases in IR-QED may lead to observable consequences in the low-frequency tail of the CMB spectrum.
- [11] arXiv:2511.14387 (交叉列表自 hep-ph) [中文pdf, pdf, html, 其他]
-
标题： 具有高阶扭曲和喷注功率修正的子结构分布标题： Parton distributions with higher twist and jet power corrections评论： 24页，11图主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex)
我们提出了一种全局确定部分子分布函数（PDFs）的方法，该方法考虑了深度非弹性散射（DIS）中的高阶扭曲修正，以及大型强子对撞机（LHC）单次包含喷注和双喷注产生数据的线性幂修正。 我们使用基于理论协方差形式主义的方法来确定这些修正及其相关的相关不确定性，该方法之前用于在全球PDF确定中考虑核不确定性以及缺失的高阶不确定性（MHOUs）。 然后，我们研究了幂修正对提取的PDFs的影响，并展示了由于在低$x$区域对DIS数据的敏感性降低（在该区域高阶扭曲不确定性相对较大），以及在相对较低的$p_T$处对单次包含喷注数据的敏感性降低（在该区域线性幂修正可能显著），从而实现了对数据的更好描述。 最后，我们评估了幂修正对与LHC现象学相关的可观测量的影响，包括通过胶子融合产生的希格斯粒子，以及$α_s$的确定。 我们发现，尽管这些影响较小，但可能是显著的，有助于改善微扰收敛性。
We present a global determination of parton distribution functions (PDFs) that accounts for higher twist corrections in deep-inelastic scattering (DIS) and linear power corrections for single inclusive jet and dijet production data from the LHC. We determine these corrections and their associated correlated uncertainties using a methodology based on the theory covariance formalism, previously used to account for nuclear uncertainties and missing higher order uncertainties (MHOUs) in global PDF determinations. We then study the impact of the power corrections on the extracted PDFs, and demonstrate an improved description of the data due to a reduced sensitivity to DIS data in the low-$x$ region where higher twist uncertainties are relatively large, and a reduced sensitivity to single inclusive jet data at relatively low $p_T$, where linear power corrections can be significant. Finally, we assess the impact of power corrections on observables relevant to LHC phenomenology, including Higgs production via gluon fusion, and the determination of $α_s$. We find that these effects, while small, can be significant, improving perturbative convergence.
交叉提交 (展示 6 之 6 条目 )
- [12] arXiv:2511.14171 (替换) [中文pdf, pdf, html, 其他]
-
标题： Kink Finder at Belle II标题： Kink Finder at Belle IIMicroBooNE collaboration: P. Abratenko, D. Andrade Aldana, L. Arellano, J. Asaadi, A. Ashkenazi, S. Balasubramanian, B. Baller, A. Barnard, G. Barr, D. Barrow, J. Barrow, V. Basque, J. Bateman, O. Benevides Rodrigues, S. Berkman, A. Bhat, M. Bhattacharya, M. Bishai, A. Blake, B. Bogart, T. Bolton, M.B. Brunetti, L. Camilleri, D. Caratelli, F. Cavanna, G. Cerati, A. Chappell, Y. Chen, J.M. Conrad, M. Convery, L. Cooper-Troendle, J.I. Crespo-Anadon, R. Cross, M. Del Tutto, S.R. Dennis, P. Detje, R. Diurba, Z. Djurcic, K. Duffy, S. Dytman, B. Eberly, P. Englezos, A. Ereditato, J.J. Evans, C. Fang, B.T. Fleming, W. Foreman, D. Franco, A.P. Furmanski, F. Gao, D. Garcia-Gamez, S. Gardiner, G. Ge, S. Gollapinni, E. Gramellini, P. Green, H. Greenlee, L. Gu, W. Gu, R. Guenette, P. Guzowski, L. Hagaman, M. D. Handley, O. Hen, C. Hilgenberg, G.A. Horton-Smith, A. Hussain, B. Irwin, M.S. Ismail, C. James, X. Ji, J.H. Jo, R.A. Johnson, D. Kalra, G. Karagiorgi, W. Ketchum, M. Kirby, T. Kobilarcik, N. Lane, J.-Y. Li, Y. Li, K. Lin, B.R. Littlejohn, L. Liu, W.C. Louis, X. Luo, T. Mahmud, N. Majeed, C. Mariani, D. Marsden, J. Marshall, N. Martinez, D.A. Martinez Caicedo, S. Martynenko, A. Mastbaum, I. Mawby, N. McConkey, L. Mellet, J. Mendez评论： 9页，6图，将提交至《核仪器与物理研究方法》A卷主题： 高能物理 - 实验 (hep-ex) ; 仪器与探测器 (physics.ins-det)
我们为Belle II实验提出了一种轨迹查找算法，该算法专门针对所谓的kinks：带电粒子在探测器材料中发生衰变或散射的特征，导致粒子飞行方向突然且显著的变化。 我们的基准研究显示，这种Kink Finder对这些特征的重建效率约为40%，而标准Belle II轨迹查找算法的值约为11%。 我们的研究还表明，Kink Finder显著提高了次级轨迹参数的分辨率，抑制了克隆轨迹的数量，并降低了K介子和π介子的PID误识别率。
We present a track-finding algorithm for the Belle II experiment that specifically targets so-called kinks: signatures of charged particles decaying or scattering in-flight in the detector material, resulting in a sudden and significant change of the particle's flight direction. Our benchmark studies of this Kink Finder show that the reconstruction efficiency for such signatures is about 40%, compared to a value of around 11% for the standard Belle II track-finding algorithm. Our studies also show that the Kink Finder significantly improves the resolution of the secondary track parameters, suppresses the number of cloned tracks, and reduces the PID misidentification rates for kaon and pions.
- [13] arXiv:2507.13103 (替换) [中文pdf, pdf, html, 其他]
-
标题： 重新评估使用自洽电子波函数的镓异常标题： Reassessing the gallium anomaly using self-consistent electron wave functions评论： 11页，5图。对电子密度计算的讨论进行了扩展，现在还包括GRASP。更新后的数值在交叉核对和改进后提供。主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex)
镓异常，即GALLEX、SAGE和最近的BEST实验在从$^{51}$Cr和$^{37}$Ar放射性源中测量的$^{71}$Ga中微子俘获率中持续存在的超过$4σ$的差异，已经挑战了粒子物理和核理论超过三十年。 我们提出了中微子俘获截面的新计算，通过数值求解狄拉克-库仑方程来处理束缚态和连续态电子状态，摒弃了传统的电子波函数一阶近似。 最后，我们重新评估了镓异常，更新了其全球意义，并以惰性中微子的角度呈现了其解释的最新状态。
The gallium anomaly, a persistent discrepancy exceeding $4σ$ in the $^{71}$Ga neutrino capture rates from $^{51}$Cr and $^{37}$Ar radioactive sources by the GALLEX, SAGE, and recently BEST experiments, has challenged particle physics and nuclear theory for over three decades. We present a new calculation of the neutrino capture cross-section, abandoning the conventional leading-order approximation for electronic wave functions by numerically solving the Dirac-Coulomb equation for both bound and continuum electron states. Finally, we re-evaluate the gallium anomaly, updating its global significance and presenting the most up-to-date status of its interpretation in terms of sterile neutrinos.
- [14] arXiv:2510.15672 (替换) [中文pdf, pdf, html, 其他]
-
标题： 基于知识蒸馏的CMS异常检测新快速机器学习算法评估标题： Evaluation of Novel Fast Machine Learning Algorithms for Knowledge-Distillation-Based Anomaly Detection at CMS主题： 高能物理 - 实验 (hep-ex)
CICADA（量能器图像卷积异常检测算法）项目旨在在大型强子对撞机（LHC）的紧凑缪子螺线管（CMS）实验中，通过质子-质子碰撞检测无偏见的异常物理信号。 CICADA使用卷积自编码器在低级量能器触发数据中识别异常，其行为通过知识蒸馏转移到紧凑的学生模型中。 精心设计的模型和量化确保在FPGA上的推理时间低于200纳秒。 我们研究了新型的学生模型架构，这些架构采用可微松弛来实现极快的推理，代价是较慢的训练——这在知识蒸馏的背景下是一个理想的权衡。 在CMS开放数据和模拟FPGA条件下的评估显示，这些模型在资源使用显著减少的情况下，实现了与经典量化基线相当的异常检测性能。 资源使用的节省使得能够观察更丰富的输入粒度。
The CICADA (Calorimeter Image Convolutional Anomaly Detection Algorithm) project aims to detect anomalous physics signatures without bias from theoretical models in proton-proton collisions at the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider. CICADA identifies anomalies in low-level calorimeter trigger data using a convolutional autoencoder, whose behavior is transferred to compact student models via knowledge distillation. Careful model design and quantization ensure sub-200 ns inference times on FPGAs. We investigate novel student model architectures that employ differentiable relaxations to enable extremely fast inference at the cost of slower training -- a welcome tradeoff in the knowledge distillation context. Evaluated on CMS open data and under emulated FPGA conditions, these models achieve comparable anomaly detection performance to classically quantized baselines with significantly reduced resource usage. The savings in resource usage enable the possibility to look at a richer input granularity.
- [15] arXiv:2502.05750 (替换) [中文pdf, pdf, html, 其他]
-
标题： 中性流$Δ$辐射单光子产生在MicroBooNE中的增强搜索标题： Enhanced search for neutral current $Δ$ radiative single-photon production in MicroBooNEM.Abreu, A.Allega, M.R.Anderson, S.Andringa, D.M.Asner, D.J.Auty, A.Bacon, T.Baltazar, F.Barão, N.Barros, R.Bayes, E.W.Beier, A.Bialek, S.D.Biller, E.Caden, M.Chen, S.Cheng, B.Cleveland, D.Cookman, J.Corning, S.DeGraw, R.Dehghani, J.Deloye, M.M.Depatie, C.Dima, J.Dittmer, K.H.Dixon, M.S.Esmaeilian, E.Falk, N.Fatemighomi, R.Ford, S.Gadamsetty, A.Gaur, D.Gooding, C.Grant, J.Grove, S.Hall, A.L.Hallin, D.Hallman, M.R.Hebert, W.J.Heintzelman, R.L.Helmer, C.Hewitt, B.Hreljac, P.Huang, R.Hunt-Stokes, A.S.Inácio, C.J.Jillings, S.Kaluzienski, T.Kaptanoglu, J.Kladnik, J.R.Klein, L.L.Kormos, B.Krar, C.Kraus, T.Kroupová, C.Lake, L.Lebanowski, C.Lefebvre, V.Lozza, M.Luo, S.Maguire, A.Maio, S.Manecki, J.Maneira, R.D.Martin, N.McCauley, A.B.McDonald, C.Mills, G.Milton, D.Morris, I.Morton-Blake, M.Mubasher, S.Naugle, L.J.Nolan, H.M.O'Keeffe, G.D.OrebiGann, S.Ouyang, J.Page, S.Pal, K.Paleshi, W.Parker, L.J.Pickard, R.C.Pitelka, B.Quenallata, P.Ravi, A.Reichold, S.Riccetto, J.Rose, R.Rosero, J.Shen, J.Simms, P.Skensved, M.Smiley, R.Tafirout, B.Tam, J.Tseng, E.Vázquez-Jáuregui, C.J.Virtue, F.Wang期刊参考： 物理评论D 112, L091101 (2025)主题： 高能物理 - 实验 (hep-ex)
我们报告了对中性流（NC）共振$Δ$(1232) 重子产生及其后续$Δ$辐射衰变（NC$Δ\rightarrow N γ$）的更新搜索结果。 我们考虑有末态质子和没有末态质子的事件；含有质子的事件可以与$Δ(1232)$重子衰变的运动学进行比较，而没有可见质子的事件代表更一般的相空间。 为了最大化对每种拓扑结构的灵敏度，我们同时使用了两种不同的重建范式，Pandora 和 Wire-Cell，它们具有互补的优势，并选择了大部分正交的事件集。 考虑到 NC$Δ\rightarrow N γ$率的整体缩放作为 MiniBooNE 异常的解释，我们的数据在 94.4% 置信水平上排除了这一假设。 当我们解耦 NC$Δ\rightarrow N γ$有末态质子和没有末态质子事件之间的预期相关性，并允许这两种事件类型的独立缩放时，我们的数据排除了那些过剩事件伴有质子的解释，但不排除那些过剩事件不伴有质子的解释。
We report results from an updated search for neutral current (NC) resonant $Δ$(1232) baryon production and subsequent $Δ$ radiative decay (NC $Δ\rightarrow N γ$). We consider events with and without final state protons; events with a proton can be compared with the kinematics of a $Δ(1232)$ baryon decay, while events without a visible proton represent a more generic phase space. In order to maximize sensitivity to each topology, we simultaneously make use of two different reconstruction paradigms, Pandora and Wire-Cell, which have complementary strengths, and select mostly orthogonal sets of events. Considering an overall scaling of the NC $Δ\rightarrow N γ$ rate as an explanation of the MiniBooNE anomaly, our data exclude this hypothesis at 94.4% CL. When we decouple the expected correlations between NC $Δ\rightarrow N γ$ events with and without final state protons, and allow independent scaling of both types of events, our data exclude explanations in which excess events have associated protons, and do not exclude explanations in which excess events have no associated protons.
- [16] arXiv:2504.00951 (替换) [中文pdf, pdf, html, 其他]
-
标题： 近期内质子-质子对撞机的物理前景标题： Physics Prospects for a near-term Proton-Proton ColliderJ. Z. Wang, L. T. Yang, Q. Yue, K. J. Kang, Y. J. Li, H. P. An, Greeshma C., J. P. Chang, H. Chen, Y. H. Chen, J. P. Cheng, W. H. Dai, Z. Deng, C. H. Fang, X. P. Geng, H. Gong, Q. J. Guo, T. Guo, X. Y. Guo, L. He, J. R. He, H. X. Huang, T. C. Huang, S. Karmakar, H. B. Li, H. Y. Li, J. M. Li, J. Li, M. C. Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Y. L. Li, Y. F. Liang, B. Liao, F. K. Lin, S. T. Lin, J. X. Liu, R. Z. Liu, S. K. Liu, Y. D. Liu, Y. Liu, Y. Y. Liu, H. Ma, Y. C. Mao, A. Mureed, Q. Y. Nie, H. Pan, N. C. Qi, J. Ren, X. C. Ruan, M. B. Shen, H. Y. Shi, M. K. Singh, T. X. Sun, W. L. Sun, C. J. Tang, Y. Tian, H. F. Wan, G. F. Wang, L. Wang, Q. Wang, Q. Wang, Y. F. Wang, Y. X. Wang, H. T. Wong, Y. C. Wu, H. Y. Xing, K. Z. Xiong, R. Xu, Y. Xu, T. Xue, Y. L. Yan, N. Yi, C. X. Yu, H. J. Yu, X. Yu, M. Zeng, Z. Zeng, F. S. Zhang, P. Zhang, Z. H. Zhang, Z. Y. Zhang, M. G. Zhao, J. F. Zhou, Z. Y. Zhou, J. J. Zhu评论： 10页附录A添加以总结美国社区的兴趣主题： 高能物理 - 实验 (hep-ex)
强子对撞机在能量前沿为通过精确测量标准模型过程以及直接搜索新粒子和相互作用提供了重要的发现潜力。 一个未来的强子对撞机将增强在电弱尺度及更高能标上的粒子物理探索，有可能使整个社区围绕一个共同项目团结起来。 LHC已经展示了超出其原始设计目标的精确测量和新物理搜索能力，而HL-LHC将继续带来新的进展。 本文强调了FCC-hh机器的物理潜力，可以直接接续HL-LHC。 为了缩短时间表和成本，评估了较低对撞机能量（低至$\sim 50$~TeV）的物理影响。 较低的质心系能量可以利用先进的磁铁技术，从而降低下一代强子对撞机的成本和时间。 这样的机器具有广泛的物理潜力，并将在希格斯测量、直接粒子产生搜索以及标准模型过程的高能测试方面取得关键性进展。 此类强子-强子对撞机的大多数预期结果优于或与其他提出的加速器项目具有竞争力，而这一选项提供了无与伦比的物理广度。 FCC计划应制定一个详细的决策过程，详细评估直接推进到强子对撞机的选项，包括降低能量目标的可能性以及分阶段安装磁铁以分散成本分布。
Hadron colliders at the energy frontier offer significant discovery potential through precise measurements of Standard Model processes and direct searches for new particles and interactions. A future hadron collider would enhance the exploration of particle physics at the electroweak scale and beyond, potentially uniting the community around a common project. The LHC has already demonstrated precision measurement and new physics search capabilities well beyond its original design goals and the HL-LHC will continue to usher in new advancements. This document highlights the physics potential of an FCC-hh machine to directly follow the HL-LHC. In order to reduce the timeline and costs, the physics impact of lower collider energies, down to $\sim 50$~TeV, is evaluated. Lower centre-of-mass energy could leverage advanced magnet technology to reduce both the cost and time to the next hadron collider. Such a machine offers a breadth of physics potential and would make key advancements in Higgs measurements, direct particle production searches, and high-energy tests of Standard Model processes. Most projected results from such a hadron-hadron collider are superior to or competitive with other proposed accelerator projects and this option offers unparalleled physics breadth. The FCC program should lay out a decision-making process that evaluates in detail options for proceeding directly to a hadron collider, including the possibility of reducing energy targets and staging the magnet installation to spread out the cost profile.
- [17] arXiv:2507.11495 (替换) [中文pdf, pdf, html, 其他]
-
标题： 二粒子碎片化和能量关联中的束缚过渡标题： Dihadron Fragmentation and the Confinement Transition in Energy CorrelatorsS. Panda (a and b), P. K. Netrakanti (a), S. P. Behera (a and b), R. R. Sahu (a), K. Kumar (a and b), R. Sehgal (a), D. K. Mishra (a and b), V. Jha (a and b) ((a) Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India, (b) Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India)评论： 5页，2图；即将发表于PRL主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex) ; 核理论 (nucl-th)
在本信中，我们将$e^+e^- \to h_1 h_2 X$的分解与共线极限下能量-能量关联函数的分解联系起来。这使我们能够对能量关联函数给出非微扰证明，将能量关联函数喷注函数与对横向动量敏感的二介子碎片函数联系起来，并提供对束缚过渡区域的严格描述。
In this letter, we relate the factorization for $e^+e^- \to h_1 h_2 X$ to the factorization for energy-energy correlators in the collinear limit. This enables us to give a nonperturbative proof of factorization for the energy correlators, relate the energy correlator jet function to transverse-momentum-sensitive dihadron fragmentation functions, and provide a rigorous description of the confinement transition region.
- [18] arXiv:2506.13802 (替换) [中文pdf, pdf, html, 其他]
-
标题： 在低能区域使用机器学习区分中子-$γ$的 EJ-276D 塑料闪烁体标题： Discrimination of neutron-$γ$ in the low energy regime using machine learning for an EJ-276D plastic scintillator评论： 替换为已发表版本。出版物已被NIM A接受主题： 仪器与探测器 (physics.ins-det) ; 高能物理 - 实验 (hep-ex) ; 核实验 (nucl-ex)
在本工作中，我们展示了使用具有脉冲形状鉴别能力的塑料闪烁体探测器对中子和$γ$事件进行鉴别的结果。 机器学习（ML）算法用于在较低能量范围内提高中子和$γ$事件之间的鉴别能力，而传统脉冲形状鉴别技术无法处理这些情况。 研究了使用多层感知机与贝叶斯推断（MLPBNN）和支持向量机（SVM）算法，这些算法基于探测器记录的波形数据。 为ML算法构建了输入变量，这些变量捕捉了中子和$γ$波形头部和尾部差异的本质。 一个新的变量，利用从波形计算出的峰度和方差的乘积，在中子和$γ$事件的分离方面表现更好。 ML算法的训练和测试使用了AmBe中子源进行。 在较低能量区域，ML预测的结果与飞行时间（ToF）技术的结果进行了比较，以评估ML算法的整体性能。 在研究的能量范围内，ML算法的结果与ToF实验的结果之间观察到了合理的一致性。 MLP BNN在中子和$γ$事件的鉴别能力方面优于SVM算法。
In this work, we present results for discrimination of neutron and $γ$ events using a plastic scintillator detector with pulse shape discrimination capabilities. Machine learning (ML) algorithms are used to improve the discriminatory power between neutron and $γ$ events at lower energy ranges which otherwise are not addressed by the conventional pulse shape discrimination techniques. The use of a multilayer perceptron with Bayesian inference (MLPBNN) and support vector machine (SVM) algorithms are studied using the recorded waveforms from the detector. Input variables are constructed for the ML algorithms, which captures the essence of the differences in the head and tail part of the neutron and $γ$ waveforms. A new variable, which utilizes the product of kurtosis and variance calculated from the waveform gives better ranking in terms of separation of neutron and $γ$ events. The training and the testing of the ML algorithms are done using an AmBe neutron source. In the lower energy region, the results obtained from the ML predictions are compared with the results obtained from a time of flight (ToF) technique to benchmark the overall performance of the ML algorithms. A reasonable agreement is observed between the results obtained from ML algorithm and the ToF experiment in the studied energy range. The MLPBNN gives better discriminatory power for the neutron and $γ$ events than the SVM algorithm.
- [19] arXiv:2511.14590 (替换) [中文pdf, pdf, html, 其他]
-
标题： JUNO探测器的初始性能结果标题： Initial performance results of the JUNO detector评论： 38页，23图主题： 高能物理 - 实验 (hep-ex) ; 仪器与探测器 (physics.ins-det)
江门中微子观测站（JUNO）于2025年8月26日开始进行物理数据采集。 JUNO由一个20千吨的液闪中心探测器组成，周围是一个35千吨的水池，用作切连科夫探测器，顶部几乎有1000米$^2$的塑料闪烁体探测器。 探测器位于一个浅层地下实验室中，覆盖层为1800米水当量。 本文介绍了探测器在水相调试阶段、随后的液闪填充阶段以及首次物理运行阶段中广泛研究的性能结果。 液闪在430纳米波长下的衰减长度达到了20.6米，而高覆盖率的光电倍增管系统和液闪共同实现了在探测器中心每兆电子伏特能量沉积约1785个光电子，这是通过使用Am-C标定源对氢核中子捕获产生的2.223 MeV$γ$进行测量得到的。 重建的能量分辨率在探测器中心两个0.511 MeV$γ$时为3.4%，在自然放射性源产生的0.93 MeV淬灭的Po-214 α衰变时为2.9%。 能量非线性校准精度优于1%。 假设达到稳态平衡，液闪中的U-238和Th-232本底污染低于10$^{-16}$ g/g。 水切连科夫探测器对于穿过液闪体积的μ子的探测效率优于99.9%。 在初始科学运行期间，数据获取的占空比超过了97.8%，证明了JUNO在高精度中微子物理方面的优异稳定性和准备就绪状态。
The Jiangmen Underground Neutrino Observatory (JUNO) started physics data taking on 26 August 2025. JUNO consists of a 20-kton liquid scintillator central detector, surrounded by a 35 kton water pool serving as a Cherenkov veto, and almost 1000 m$^2$ of plastic scintillator veto on top. The detector is located in a shallow underground laboratory with an overburden of 1800 m.w.e. This paper presents the performance results of the detector, extensively studied during the commissioning of the water phase, the subsequent liquid scintillator filling phase, and the first physics runs. The liquid scintillator achieved an attenuation length of 20.6 m at 430 nm, while the high coverage PMT system and scintillator together yielded about 1785 photoelectrons per MeV of energy deposit at the detector centre, measured using the 2.223 MeV $γ$ from neutron captures on hydrogen with an Am-C calibration source. The reconstructed energy resolution is 3.4% for two 0.511 MeV $γ$ at the detector centre and 2.9% for the 0.93 MeV quenched Po-214 alpha decays from natural radioactive sources. The energy nonlinearity is calibrated to better than 1%. Intrinsic contaminations of U-238 and Th-232 in the liquid scintillator are below 10$^{-16}$ g/g, assuming secular equilibrium. The water Cherenkov detector achieves a muon detection efficiency better than 99.9% for muons traversing the liquid scintillator volume. During the initial science runs, the data acquisition duty cycle exceeded 97.8%, demonstrating the excellent stability and readiness of JUNO for high-precision neutrino physics.
- [20] arXiv:2505.07269 (替换) [中文pdf, pdf, html, 其他]
-
标题： 伪势，一种被忽视的DFT误差来源和解决方法标题： Pseudopotentials, an overlooked source and remedy of DFT errors评论： 被《化学理论与计算杂志》接受主题： 材料科学 (cond-mat.mtrl-sci) ; 计算物理 (physics.comp-ph)
第一性原理计算高度依赖赝势，但它们对准确性的影响几乎未被讨论。 在本工作中，我们表明迄今为止大多数赝势引入了误差，这些误差表现为原子能级的误差，导致与Hohenberg-Kohn定理的$de facto$偏离。 我们考虑了原子级调整的赝势，其与交换-关联泛函的相互作用提供了一种实用的修正，平衡了准确性和效率。 我们通过包含单价Cu的54种半导体的带隙计算来验证我们的理论。 与传统研究的结果相比，这些结果不仅消除了11种化合物的所有错误金属预测，还将平均相对误差从80%降低到20%。 总体准确性甚至超过了标准杂化泛函和GW方法。
First-principles calculations rely heavily on pseudopotentials, yet their impact on accuracy is hardly addressed. In this work, we show that most pseudopotentials to date introduce errors, which manifest themselves as errors of atomic energy levels, leading to a $de facto$ deviation from the Hohenberg-Kohn theorem. We consider the atomic-level adjusted pseudopotentials, whose interplay with exchange-correlation functional provides a pragmatic correction that balances accuracy and efficiency. We benchmark our theory with bandgap calculation for 54 semiconductors containing monovalent Cu. The results, compared to those from conventional studies, not only remove all erroneous metal predictions for 11 compounds, but also reduce the mean relative error from 80\% to 20\%. Overall accuracy even exceeds those of standard hybrid functionals and GW methods.
- [21] arXiv:2511.13962 (替换) [中文pdf, pdf, html, 其他]
-
标题： 轻暗物质的DAMIC-M日调制约束标题： Daily Modulation Constraints on Light Dark Matter with DAMIC-M评论： 11页，5图，已提交至PRD主题： 高能物理 - 实验 (hep-ex)
暗物质晕中粒子到达地下探测器的通量，由于地球内部的相互作用，对于足够大的散射截面会显著衰减。 这种衰减导致检测率出现特征性的每日调制，这是由于地球的自转引起的。 我们展示了使用DAMIC-M低本底腔体收集的1.257 kg-day数据集搜索这种调制的结果。 一种与模型无关的分析显示，在1到48小时的时间段内，1e-事件率没有显著的调制，突显了探测器出色的时空稳定性。 在一种互补的与模型相关的分析中，我们针对暗物质粒子预期的每日调制特征，这些粒子的质量范围在[0.53,2] MeV/c2之间，并通过暗光子媒介与电子相互作用。 通过利用信号预期的时间演化，我们对低于1.2 MeV/c2的暗物质质量设定了改进的限制，超过了我们之前的限制。
The flux of Hidden Sector particles from the Galactic halo reaching an underground detector can be significantly attenuated by interactions within the Earth for sufficiently large scattering crosssections. This attenuation gives rise to a characteristic daily modulation in the detection rate, due to Earth's rotation. We present results from a search for such a modulation using a 1.257 kg-day dataset collected with the DAMIC-M Low Background Chamber. A model-independent analysis reveals no significant modulation in the 1e- event rate over periods from 1 to 48 h, highlighting the excellent temporal stability of the detector. In a complementary model-dependent analysis, we target the expected daily modulation signature of Hidden Sector particles, with masses in the range [0.53,2] MeV/c2, interacting with electrons via a dark photon mediator. By leveraging the expected temporal evolution of the signal, we set improved constraints on Dark Matter masses below 1.2 MeV/c2, surpassing our previous limits.