Measurement of solar $pp$ neutrino flux with the new PandaX-4T data
Shanghai Jiao Tong University（上海交通大学）；Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province（四川省锦屏深地前沿科学与暗物质重点实验室）；Yalong River Hydropower Development Company, Ltd.（雅砻江流域水电开发有限公司）
We report a new measurement of the solar proton--proton ($pp$) neutrino flux via neutrino--electron elastic scattering using the PandaX-4T Run 2 data set collected between 2024 and 2026, corresponding to an exposure of 1.9 tonne$\cdot$yr. Before Run 2 data taking, the detector underwent a series of upgrades to improve its response and background conditions. Time variations of radioactive noble-gas impurities are constrained using the physics data themselves, complemented by measurements from the gas-assay system. The analysis introduced improvements in the data processing chain, detector response characterization, and background models. A blind spectral analysis was then performed on the electronic-recoil data across a wide energy range from 20 to 1000 keV. In combination with the Run 0 data published earlier, the fitted $pp$ flux is $(8.5 \pm 3.5)\times 10^{10}$ $\mathrm{cm^{-2}s^{-1}}$, consistent with the prediction of the Standard Solar Model. With a statistical significance of $2.2σ$ above background, this marks the first positive indication of solar $pp$ neutrino--electron scattering below an electronic-recoil energy of 165 keV.
Search for Diffuse Supernova Neutrino Background of All Flavors with PandaX-4T
Research Center for Particle Science and Technology, Institute of Frontier and Interdisciplinary Science, Shandong University（山东大学前沿交叉科学研究院粒子科学与技术研究中心）；Key Laboratory of Particle Physics and Particle Irradiation of the Ministry of Education, Shandong University（山东大学教育部粒子物理与粒子辐照重点实验室）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院暗物质物理全国重点实验室粒子天体物理与宇宙学教育部重点实验室上海市粒子物理与宇宙学重点实验室）；New Cornerstone Science Laboratory, Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交通大学新Cornerstone科学实验室汤川秀树研究所）；Shanghai Jiao Tong University Sichuan Research Institute（上海交通大学四川研究院）
GPS-Synchronized Monitoring of Core-collapse Supernova Bursts with PandaX-4T via Coherent Elastic Neutrino Nuclear Scattering
Research Center for Particle Science and Technology, Institute of Frontier and Interdisciplinary Science, Shandong University（山东大学前沿交叉科学研究院粒子科学与技术研究中心）；Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education, Shandong University（山东大学教育部粒子物理与粒子辐照重点实验室）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院暗物质物理国家重点实验室粒子天体物理学与宇宙学教育部重点实验室上海粒子物理与宇宙学重点实验室）；Shanghai Jiao Tong University Sichuan Research Institute（上海交通大学四川研究院）；Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province（四川省深地前沿科学与暗物质重点实验室）；Yalong River Hydropower Development Company, Ltd.（雅砻江流域水电开发有限公司）
Probing scalar-neutrino and scalar-dark-matter interactions with PandaX-4T
SJTU Paris Elite Institute of Technology, Shanghai Jiao Tong University（上海交通大学巴黎卓越工程师学院）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院暗物质物理全国重点实验室粒子天体物理 cosmology 教育部重点实验室上海粒子物理与宇宙学上海市重点实验室）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, New Cornerstone Science Laboratory, Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交通大学物理与天文学院暗物质物理全国重点实验室粒子天体物理 cosmology 教育部重点实验室上海粒子物理与宇宙学上海市重点实验室新基石科学实验室李政道研究所）；Shanghai Jiao Tong University Sichuan Research Institute（上海交通大学四川研究院）；Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province（四川省锦屏深地前沿科学与暗物质重点实验室）；Yalong River Hydropower Development Company, Ltd.（雅砻江流域水电开发有限公司）；School of Physics, Beihang University（北京航空航天大学物理学院）
Search for neutrinoless quadruple beta decay of $^{136}$Xe in PandaX-4T detector
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University（中山大学中法核工程与技术学院）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院暗物质物理全国重点实验室粒子天体物理宇宙学教育部重点实验室上海粒子物理与宇宙学上海市重点实验室）；State Key Laboratory of Dark Matter Physics, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, New Cornerstone Science Laboratory, Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交通大学物理与天文学院新cornerstone科学实验室李政道研究所暗物质物理全国重点实验室粒子天体物理宇宙学教育部重点实验室上海粒子物理与宇宙学上海市重点实验室）；Shanghai Jiao Tong University Sichuan Research Institute（上海交通大学四川研究院）；Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province（四川省锦屏深地前沿科学与暗物质重点实验室）；Yalong River Hydropower Development Company, Ltd.（雅砻江流域水电开发有限公司）
Testing light and heavy vector mediators with solar CE$ν$NS measurements
Instituto de Física Corpuscular (IFIC), CSIC‐Universitat de Valéncia（粒子物理研究所（IFIC），西班牙科学委员会-瓦伦西亚大学）；University of Hamburg（汉堡大学）；Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所（INFN），格兰萨索国家实验室）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）；Gran Sasso Science Institute（格兰萨索科学研究所）
