尊敬的专家学者:
由中科院高能所、中科院理论所、上海交通大学、东南大学、国科大杭州高等研究院及中山大学联合主办,中山大学承办的“中微子及相关新物理研讨会” (Workshop on Neutrinos and related New Physics Research, NuPhyR) 将于2025年11月28日至12月1日在中山大学珠海校区举行。我们诚挚邀请并期待您参加!
中微子作为最神秘的基本粒子之一,在多个重大科学问题中发挥着关键作用。无论是宇宙演化、正反物质不对称性,还是中微子质量的产生与超高能宇宙线的起源,这些基本问题都与中微子密切相关。如果中微子具有马约拉纳性质,则可能通过轻子生成机制解释宇宙中的正反物质不对称性。同时,中微子质量对宇宙大尺度结构的形成与演化也具有重要影响。此外,中微子质量的产生机制可能与轻子数破坏、暗物质等超出标准模型的新物理有着紧密的联系。
另一方面,超高能中微子作为独特的探针,有望揭示超高能宇宙线的起源。中微子天文学的发展同样为探测惰性中微子等新粒子提供了重要手段。在反应堆、加速器、对撞机以及中微子散射实验中,对中微子的研究能够精确测量其非标准相互作用,并进一步探索新物理的潜在可能性。
本次会议旨在推动中微子物理相关研究领域的交叉融合,以加强交流并促进合作。
会议时间:2025年11月28日报到注册,12月1日离会。
地点:珠海唐邑酒店
食宿:会务组统一安排食宿,费用自理。
注册费:教师或博士后800元/人,学生500元/人。
注册截止日期:2025年10月25日。
报告摘要截止提交日期:2025年11月14日。
如学生有意愿作海报展示,请于2025年11月14日前提交摘要。
组委会:
葛韶锋、李刚、于江浩、张永超、周顺、周也铃(按姓氏拼音顺序)
会务组:
韩成成、李刚、李浩林、廖佳军、卢思达、唐健、魏月环、杨莉莉(按姓氏拼音顺序)
联系人:
李刚 ligang65@mail.sysu.edu.cn
卢思达 lusd5@mail.sysu.edu.cn
袁彬 yuanb25@mail.sysu.edu.cn(会议秘书)
中科院高能所、中科院理论所、上海交通大学、东南大学、国科大杭州高等研究院、中山大学(承办)
The original modular flavor symmetry requires supersymmetry to enforce the Yukawa couplings to be holomorphic modular forms. The non-holomorphic modular symmetry is a generation in which supersymmetry is unnecessary in principle. In this talk, we shall present motivation, the formalism and application of non-holomorphic modular symmetry. A predictive model for both quarks and leptons will be presented, the phenomenological predictions are explored.
Many Baryogenesis mechanisms have been proposed to address the baryon asymmetry of the universe, of which the Leptogenesis mechanism has received widespread attention due to the flourishing development of the neutrino physics. In this talk I will give a brief review on recent progress of the Leptogenesis mechanism.
We present an automatic renormalization group equations (RGEs) solver, D7RGESolver, designed for the precise numerical solution of one-loop RGEs of dim-7 operators within the SMEFT. This tool is capable of calculating the RGE effects of dim-5 and dim-7 SMEFT operators between any two scales above the electroweak scale. We take the nuclear neutrinoless double beta ($0\nu\beta\beta$) decay process as an example to appreciate the importance of the running effects in phenomenological studies. Our analysis demonstrates that $0\nu\beta\beta$ decay can constrain nearly all dim-7 SMEFT operators involving first-generation leptons that violate lepton number by two units, after accounting for RGE effects. Specifically, we have placed meaningful constraints on 55 dim-7 Wilson coefficients, compared to only 10 from a simple tree-level analysis. Certain operators exhibit much stricter constraints when RGE effects are included, especially for the operators that mix with neutrino mass operators.
Leptogenesis provides an elegant mechanism to explain the observed baryon asymmetry of the Universe (BAU), yet its experimental verification remains challenging due to requirements of either extremely heavy right-handed neutrinos or precisely fine-tuned mass splittings.
We present a scenario where an additional scalar field, coupled to both the Higgs and right-handed neutrinos (RHNs), enhances the CP asymmetry through loop-level contributions, enabling successful leptogenesis at the electroweak scale. This same scalar sector triggers a strong first-order electroweak phase transition (EWPT), producing gravitational waves (GWs) within the reach of next-generation detectors. We demonstrate a robust correlation between the BAU and GW signal strength, offering a concrete path to experimentally probe leptogenesis at future GW observations.
We propose a parametrization of neutrino masses and mixing in the minimal seesaw model (MSM). The MSM, which introduces two heavy sterile neutrinos, is the minimal extension of the Standard Model in addressing the tiny masses of active neutrinos. The parametrization includes 11 free parameters: 6 neutrino oscillation parameters (2 mass-squared differences $\Delta m^2_{21}$, $\Delta m^2_{31}$, 3 mixing angles $\theta_{12}$, $\theta_{13}$, $\theta_{23}$, and 1 Dirac phase $\delta_{\rm CP}$), 1 mass parameter in $0\nu2\beta$ decay $m_{ee}$, and 4 additional parameters: 2 heavy neutrino masses $M_1$ and $M_2$, 1 active-sterile mixing angle $\theta_{14}$ and 1 CP-violating phase $\delta_{14}$. This parametrization is derived exactly from the most general neutrino mass matrix in the MSM without any approximation. We further discuss its implications in phenomenological studies.
We present a model-independent search for a dark particle $\chi$ produced via four-fermion effective interactions at the DUNE Near Detector, COHERENT, and CONUS+ experiments. Analyzing scalar, pseudoscalar, vector, axial-vector, and tensor operators, we find a clear sensitivity hierarchy. DUNE-ND dominates for most interactions due to its high-intensity beam, while COHERENT and CONUS+ provide complementary constraints at lower masses. The results, strongly dependent on the Lorentz structure, give stringent universal bounds applicable to scenarios like Left-Right Symmetric Models and sterile neutrinos, offering a powerful tool for interpreting future neutrino data.
We discuss the dark photon and $Z^\prime$ emission from supernova. We evaluate the production amplitude for the dark photon and $Z^\prime$ via nucleon bremmstrahlung process $NN\rightarrow NN Z^\prime$. Finally, We derive the SN1987A constraints on dark photon and $Z^\prime$ from the stellar cooling argument.
我们将在报告中讨论有限温度场论在电弱相变中的应用及其理论不确定性。
The recent IceCube detection of TeV neutrinos from the nearby Seyfert galaxy NGC~1068 suggests that active galactic nuclei (AGN) could make a significant contribution to the diffuse flux of astrophysical neutrinos.
The absence of TeV gamma-rays from NGC~1068 indicates neutrino production in
the vicinity of the supermassive black hole, such as disk-corona, where the high radiation density leads to efficient neutrino production and severe gamma-ray attenuation. Disk-corona models predict that the neutrino emission from AGNs correlates
with X-ray emission, which traces the coronal activity.
In this paper, we assess whether the X-ray AGN population origin for TeV neutrinos can be tested by using the spatial correlation between the neutrino population and X-ray AGN population with future neutrino telescopes.
By performing simulations, we find that, for $100-300$~TeV diffuse neutrino flux, the AGN origin can be tested at a confidence level of $\sim3\sigma$ with five-year observations of IceCube-Gen2, which has an angular resolution of $0.1-0.2$ degree. With better angular resolution and sensitivity in the 100-300 TeV energy range, a 30 ${\rm km^3}$ undersea
neutrino telescope (e.g., HUNT) is expected to reach a significance of $\sim5\sigma$ in testing the association after three years of exposure.
The origin of TeV-PeV neutrinos detected by IceCube remains largely unknown. The most significant individual neutrino source is the Seyfert galaxy NGC 1068 with a soft spectrum. Another notable candidate is the Seyfert galaxy NGC 7469, which has been recently proposed as a potential neutrino
emitter. The likelihood fit of the IceCube data for this source returned a hard spectral index of $\sim 1.9$ and the excess is dominated by two high-energy events.
The energies of these two neutrinos are estimated to be $100-200\,$TeV, implying a maximum proton energy $E_{p,{\rm max}}>2\,{\rm {PeV}}$, significantly higher than that in NGC 1068.
In this paper, we analyze the {\it Fermi}-LAT observations of NGC 7469, which yield non-detection.
The size of the neutrino-emitting region can be constrained by the non-detection when the neutrino flux takes a high value in the allowed range.
We suggest that cosmic-ray protons are accelerated to PeV energies via turbulence or magnetic reconnection in the corona and produce $\sim100-200$ TeV neutrinos via $p\gamma$ process.
In the turbulence acceleration scenario, the required maximum proton energy can be achieved with a magnetization parameter of $\sigma\sim 1$, while in the reconnection scenario, a magnetization parameter with $\sigma\sim 10$ is needed. In both scenarios, a pair dominated composition for the corona is preferred.
The difference in the neutrino spectrum between NGC 7469 and NGC 1068 could be due to a different magnetization parameter despite the fact that they belong to the same type of AGN.
We investigate constraints on neutrino non-standard interactions (NSIs) in the effective field theory framework, using data from the first measurement of solar $^8$B neutrinos via coherent elastic neutrino-nucleus scattering (CE$\nu$NS) in the PandaX-4T and XENONnT experiments and data from the COHERENT experiment. The impacts of neutrino NSIs on the CE$\nu$NS cross section and the matter effect in the propagation of solar neutrinos are included, while we obtain that the expected number of CE$\nu$NS events is more sensitive to neutrino NSIs appearing in the cross section.
Due to relatively large statistical uncertainties, the sensitivities of the PandaX-4T and XENONnT experiments to the neutrino NSIs are currently limited, compared to the COHERENT experiment. Besides, we find that since the central value of the measured CE$\nu$NS counts significantly differs from the Standard Model prediction, the sensitivity of PandaX-4T experiment is even more restricted compared to XENONnT.
However, the measurements of PandaX-4T and XENONnT are uniquely sensitive to the neutrino NSIs for the $\tau$ flavor due to oscillation feature of the solar $^8$B neutrinos.
We also assess how the experimental central value, exposure, and systematic uncertainties will affect the constraints on neutrino NSIs from various CE$\nu$NS measurements in the future.
I will discuss supernova constraints on millicharged particles and axions, including both supernova cooling limits and low-energy supernova constraints.
In the construction of future lunar scientific stations, radio arrays can be deployed on the lunar surface and around subsurface lava tubes to detect high-energy neutrinos. The Askaryan effect, generated by the interaction between high-energy neutrinos and lunar regolith, produces radio emissions. On Earth, detecting radio signals from this effect is subject to significant radio frequency interference, resulting in a low signal-to-noise ratio for neutrino-related signals. This report presents the observation of radio signals within mountain rock caves of a certain thickness. The implementation of detection technologies related to this method will significantly enhance the likelihood of detecting neutrinos. As a prospective project proposal, this report addresses the identification, directional localization, and energy reconstruction of neutrino-associated radio signals from three aspects: the antenna array system, the ultra-low-noise nanosecond-scale pulse signal acquisition system, and the online signal identification and storage system.
Core-collapse supernovae (CCSNe) mark the death of massive stars greater than about 8 solar masses. They are the birthplaces of neutron stars and black
holes, as well as the factories of heavy elements. The physical mechanism(s) driving their explosions is a premier open problem in astrophysics. In this talk, I will first introduce recent global efforts in advanced computer simulations that enhance our understanding of how CCSNe explode. Next, I will discuss the theoretical predictions of CCSN neutrino signals and what we can learn from them.
The study of nuclear double beta decay provides a uniquely sensitive window into physics beyond the Standard Model. While the two-neutrino mode, a rare second-order weak process, has been observed in several isotopes, the search for the neutrinoless mode remains a paramount objective in particle and nuclear physics. The observation of this decay would be a landmark discovery, as it violates total lepton number conservation and would definitively establish that neutrinos are Majorana particles. This talk will review the profound theoretical motivations for searching for double beta decay. Beyond the standard mass mechanism where light, active Majorana neutrinos are responsible for the decay, I will also explore how these searches constrain other Beyond-the-Standard-Model scenarios, such as non-standard neutrino interactions, sterile neutrinos, Majorons and other dark sector particles coupling to neutrinos. Here, I will highlight the importance of the measured two-neutrino mode, solidifying the role of double beta decay as a powerful and essential probe of New Physics.
In 2021, LHAASO observed a large number of PeV cosmic ray candidates in the Milky Way. We proposed to build a telescope with at least 30 times the sensitive volume of the IceCube detector, so as to observe those LHAAASO sources. In order to realize this project, we innovatively put forward a photosensitive detector unit based on a photomultiplier tube with a maximum photosensitive area of 20 inches. We have already started the prototype work in Lake Baikal and South China Sea respectively. It is estimated that within three years, we will complete the R&D work of the project.
Over the past ten years, several breakthroughs have been made in multi-messenger astronomy. Thanks to the IceCube Neutrino Observatory, the detection of astrophysical neutrinos was proved to be practical. However, due to the limited statistics and field of view, only a few sources have been associated with IceCube neutrinos, making new and larger neutrino telescopes necessary. NEON is a proposed NEutrino Observatory in the Nanhai to be complementary for the global neutrino detectors. This talk presents the detector array’s design, layout, and comprehensive performance including angular resolution and point source sensitivities. We further report the current status of simulations and detector construction efforts.
Collider neutrinos open a new window into high-energy neutrino interactions and forward physics at hadron colliders. In this talk, I will first outline the motivation for studying collider neutrinos and introduce the LHC experiments FASER$\nu$ and SND@LHC. I will then discuss the production and detection of collider neutrinos, along with estimates of their fluxes and interaction rates at FASER\nu$. Recent experimental milestones—including the first observation of collider neutrinos, the first cross-section measurements, and the first flux determinations—will be highlighted. I will show how these results can constrain proton parton distribution functions and test hadronic interaction models relevant to astroparticle physics. Possible implications for physics beyond the Standard Model and prospects at future facilities such as the FCC-hh and muon colliders will also be briefly discussed.
Charged-current quasielastic neutrino scattering is the signal process in neutrino oscillation experiments and requires precise theoretical prediction for the analysis of modern and future experimental data, starting with the nucleon vector and axial-vector coupling constants and axial-vector form factor at higher energies. In this talk, I compare a new MINERvA measurement of this form factor with lattice-QCD calculations and deuterium bubble- chamber data, provide uncertainty projections for future extractions, present recent calculations of radiative corrections to charged-current processes, and investigate the potential of neutrino scattering data on constraining nucleon- and quark-level interactions beyond the Standard Model.
We propose a new mechanism wherein the electron and muon masses are generated at the one-loop level following the dynamical violation of the Ising fusion rule symmetry. This rule, being the minimal symmetry required to realize our model, also plays a crucial role in the neutrino sector. There, while neutrino masses are likewise generated at one loop, the Ising fusion rule stabilizes the particles inside the loop, effectively functioning as an unbroken Z2 symmetry to all orders. We subsequently investigate lepton flavor-violating processes, the muon’s anomalous magnetic dipole moment, and the relic density of dark matter. For the latter, we identify a singlet boson as our dark matter candidate and provide an initial estimate of its relic density via the annihilation cross section. Finally, we present results for both the dark matter annihilation cross section and the muon g − 2 that are consistent with neutrino oscillation data and satisfy the constraints from lepton flavor violation.
射电探测具备其它类型探测器的大部分优点,且单个造价低廉,适合大规模铺设,被认为是研究超高能粒子的理想的下一代探测技术。截至目前为止,国际上已经提出地面或高山铺设,气球和卫星搭载,月基铺设等多种探测方案。国内截至目前为止,仅一个地面铺设方案在研。本报告将探讨这些探测方案的优劣,目的是找到一个性价比高(投入较少,灵敏度高),并能与其它技术组成联合观测的实验方案。
We present a comprehensive theoretical analysis of neutrino-induced decoherence in macroscopic matter-wave interferometry experiments designed to search for dark matter and beyond-Standard Model physics. Our calculation includes contributions from the cosmic neutrino background (CνB), solar neutrinos, and reactor antineutrinos, accounting for coherent scattering processes across nuclear, atomic, and macroscopic length scales. Within the Standard Model, we find negligible decoherence rates for planned experiments such as MAQRO (s/σs ∼ 10−27) and terrestrial interferometers like Pino (s/σs ∼ 10−22). However, these experiments achieve competitive sensitivity to beyondStandard Model physics through light vector mediator interactions, with CνB constraining coupling products to gνgn ≲ 10−17 for Z ′ masses below 1 eV. Our results provide a theoretical framework for interpreting matter-wave interferometry measurements in terms of neutrino interaction physics and for deriving constraints on BSM models from experimental data.
Neutrino self-interactions (νSI) mediated by light bosonic particles can produce characteristic spectral dips in astrophysical neutrino fluxes, thereby modifying the expected energy spectrum. The high-energy astrophysical neutrino spectrum has been extensively used to probe νSI models through these distinctive features. The recent detection of the ultrahigh-energy event KM3-230213A offers a new opportunity to explore νSI phenomenology at extreme energies. In this work, we investigate two implications of this observation under the assumption that the event originates from a diffuse power-law spectrum. First, we find that νSI induces spectral distortions that can mildly alleviate tensions between the KM3-230213A detection and the previous non-observation of PeV-scale neutrinos in IceCube data. Second, we derive new constraints on the νSI coupling strength for mediator masses around 100 MeV. Our analysis shows that neutrino telescopes can surpass existing collider constraints in this mass range. In the near future, IceCube-Gen2 is expected to substantially enhance the sensitivity to νSI over a broader range of parameter space.