Latest results from the IceCube Experiment
Anthony M Brown
冰立方合作组织目前正在南极建造世界上最大的中微子望远镜，以观测来自各种天体物理来源的高能中微子。在本文中，我们回顾了冰立方实验的现状，突出了迄今为止所取得的一些成果。
The IceCube Collaboration is currently building the world's largest neutrino telescope at the South Pole to observe high energy neutrinos from a variety of astrophysical sources. In this paper we review the current status of the IceCube experiment, highlighting some of the results obtained so far.
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Updated directions of IceCube HESE events with the latest ice model using DirectFit
本研究利用现场校准改进的最新冰模型，通过 DirectFit 精确重建 IceCube 高能起始事件，获得了更准确的单事件方向描述，并更新了基于聚合样本的天体源搜索结果。
Latest results from the IceCube Neutrino Observatory
冰立方中微子观测站通过中微子测量探索高能宇宙，本文总结了最近的成果，包括对NGC 1068持续中微子源的后续研究、弥漫天体中微子风味组成测量、大气中微子限制以及太阳暗物质湮灭中微子搜索，揭示中微子产生机制和超出标准模型的物理。
Instrumenting a gigaton of ice at the geographic South Pole, the IceCube Neutrino Observatory has been at the forefront of groundbreaking scientific discoveries over the past decade. These include the observation of a flux of TeV-PeV astrophysical neutrinos, detection of the first astrophysical neutrino on the Glashow resonance and evidence of the blazar TXS 0506+056 as the first known astronomical source of high-energy neutrinos. Several questions, however, remain, pertaining to the precise origins of astrophysical neutrinos, their production mechanisms at the source and in Earth's atmosphere…
Neutrino Astronomy with the IceCube Observatory
冰立方是km^3级中微子望远镜的第一个代表，也是目前对高能中微子最灵敏的探测器。它的主要任务是寻找银河系和河外高能中微子源，但它也是一个优秀的探测器，用于研究各种其他高度热门的天体物理学和粒子物理学主题，如超新星，暗物质和中微子振荡。本文在介绍中微子天文学和中微子望远镜的基础上，介绍了IceCube中微子探测器在宇宙高能中微子源探测方面的最新成果。
The IceCube Neutrino Observatory is the world's largest neutrino detector, instrumenting a cubic kilometer of ice at the geographic South Pole. The detector probes neutrino energies from GeV to PeV, and collects high statistics neutrino samples by virtue of its extremely large volume. IceCube was designed to detect high-energy neutrinos from potential cosmic ray acceleration sites such as active galactic nuclei, gamma ray bursts and supernova remnants. IceCube announced the detection of a diffuse flux of astrophysical neutrinos in 2013, including the highest energy neutrinos ever detected. Ice…
The IceCube neutrino observatory has established the existence of an astrophysical diffuse neutrino component above $100$ TeV. This discovery was made using the high-energy starting event sample, which uses the outer layer of instrumented volume as a veto to significantly reduce atmospheric background. We present the latest astrophysical neutrino flux measurement using high-energy starting events. This latest iteration of the analysis extends the sample by $1.5$ years for a total of $7.5$ years, updates the event properties with newer models of light transport in the glacial ice, and has an im…
Superheavy dark matter may show its presence in high energy neutrino signals detected on earth. From the latest results of IceCube, we could set the strongest lower bound on the lifetime of dark matter beyond 100 TeV around $10^{28} {\rm sec}$. The excess around a PeV is noticed and may be interpreted as the first signal of DM even though further confirmation and dedicated searches are invited.
The nature of Dark Matter (DM) remains one of the most important unresolved questions of fundamental physics. Many models, including Weakly Interacting Massive Particles (WIMPs), assume DM to be a particle and predict a weak coupling with Standard Model matter. If DM particles can scatter off nuclei in the vicinity of a massive object such as a star or a planet, they may lose kinetic energy and become gravitationally trapped in the center of such objects, including Earth. As DM accumulates in the center of the Earth, self-annihilation of WIMPs into Standard Model particles can result in an exc…
Multi-messenger searches for gravitational waves and high-energy neutrinos provide important insights into the dynamics of and particle acceleration by black holes and neutron stars. With LIGO's third observing period (O3), the number of gravitational wave detections has been substantially increased. The rapid identification of joint signals is crucial for electromagnetic follow-up observations of transient emission that is only detectable for short periods of time. High-energy neutrino direction can be reconstructed to sub-degree precision, making a joint detection far better localized than a…
Multi-messenger Study of Galactic Diffuse Emission with LHAASO and IceCube Observations
针对LHAASO观测的银河系PeV伽马射线弥散发射光谱中的异常凸起，引入两个具有ECPL谱型的未解析源成分构建模型，模拟的银河系弥散中微子通量与IceCube观测一致，并估算出20 TeV处银河系中微子占天体物理中微子的约9%。
Insights from LHAASO and IceCube into the origin of the Galactic diffuse TeV--PeV emission
通过比较LHAASO和IceCube观测，结合脉冲星晕建模，证明轻子成分贡献可解释银河系弥散TeV--PeV伽马射线发射超出，并符合银河经度分布。
We have built regions in a Sky map where it should be expected the arrival of 120 EeV ultrahigh energy cosmic rays (UHECR) directionally correlated with the latest astrophysical neutrino tracks observed at IceCube, which are taken as point sources. In order to calculate these arrival directions we have considered contributions to the cosmic rays deflections originated by the galactic and the extragalactic magnetic field, and a UHECR composition compatible with the current expectations. We have used the Jansson-Farrar JF12 model for the Galactic magnetic field and an extragalactic magnetic fiel…
Updated Earth Tomography Using Atmospheric Neutrinos at IceCube
本研究利用 IceCube 11 年大气 μ 子中微子数据，通过多壳层密度参数化测量上行中微子通量随赤纬的变化，实现对地球密度和质量的最新弱力驱动层析成像。
Since the detection of high-energy cosmic neutrinos at the IceCube Neutrino Observatory in 2013, there has been an on-going search to find the origins of this flux. Despite recent evidence identifying a flaring blazar as a possible neutrino source, the vast majority of the diffuse neutrino flux measured by IceCube remains unexplained. Here, the latest IceCube results testing time-dependent correlation between neutrinos and Tidal Disruption Events (TDEs) are presented, limiting the contribution of jetted and non-jetted TDEs to the diffuse astrophysical neutrino flux to be less than 1.3% and 26%…
Results from the IceCube Experiment - Neutrino 2012
Neutrino 2012 Proceedings of the recent results from the IceCube experiment.
We analyze the energy and zenith angle distributions of the latest 2-year IceCube dataset of upward going atmospheric neutrinos to constrain sterile neutrinos at the eV scale in the 3+1 scenario. We find that the parameters favored by a combination of LSND and MiniBooNE data are excluded at more than the 99% C.L. We explore the impact of nonstandard matter interactions on this exclusion, and find that the exclusion holds for nonstandard interactions (NSI) that are within the stringent model-dependent bounds set by collider and neutrino scattering experiments. However, for large NSI parameters …
Recent IceCube Results: Diffuse Flux, Point Sources and Dark Matter
本文介绍了 IceCube 实验的最新结果，重点总结了天体物理中微子弥散通量的测量、点源搜寻（包括耀变体与星系等）以及暗物质间接搜寻的最新进展与限制。
The recent high-statistics high-energy atmospheric neutrino data collected by IceCube open a new window to probe new physics scenarios that are suppressed in lower energy neutrino experiments. In this paper we analyze the IceCube atmospheric neutrino data to constrain the Violation of Equivalence Principle (VEP) in the framework of three neutrinos with non-universal gravitational couplings. In this scenario the effect of VEP on neutrino oscillation probabilities can be parametrized by two parameters $Δγ_{21}\equiv γ_2-γ_1$ and $Δγ_{31}\equiv γ_3-γ_1$, where $γ_i$'s denote the coupling of neutr…
Sensitivity of the IceCube Upgrade to Atmospheric Neutrino Oscillations
本文介绍了IceCube Upgrade通过新增硬件提升GeV能级探测能力，并基于模拟与重建技术的最新进展更新了对大气中微子振荡的灵敏度。
Indirect Dark Matter search with large neutrino telescopes
暗物质是中微子天文学的主要目标之一。目前，在冰和水中有两个基于切伦科夫技术的大型中微子望远镜：南极的IceCube和北半球的ANTARES。这两台望远镜都在通过寻找来自天体物理大质量物体的统计过量中微子来间接搜索暗物质。这种过剩可能是这些物体中心暗物质粒子可能湮灭的证据。在一个最流行的场景中，暗物质由WIMP粒子组成。本文介绍了ANTARES中微子望远镜间接探测太阳暗物质通量的分析和结果，以及IceCube最新公布的不同暗物质模型的灵敏度结果。
The last IceCube catalog of High Energy Starting Events (HESE) obtained with a livetime of 1347 days comprises 54 neutrino events equally-distributed between the three families with energies between 25 TeV and few PeVs. Considering the homogeneous flavors distribution (1:1:1) and the spectral features of these neutrinos the IceCube collaboration claims the astrophysical origin of these events with more than $5σ$. The spatial distribution of cited events does not show a clear correlation with known astrophysical accelerators leaving opened both the Galactic and the extra-Galactic origin interpr…
We explore the correlation of $γ$-ray emitting blazars with IceCube neutrinos by using three very recently completed, and independently built, catalogues and the latest neutrino lists. We introduce a new observable, namely the number of neutrino events with at least one $γ$-ray counterpart, $N_ν$. In all three catalogues we consistently observe a positive fluctuation of $N_ν$ with respect to the mean random expectation at a significance level of $0.4 - 1.3$ per cent. This applies only to extreme blazars, namely strong, very high energy $γ$-ray sources of the high energy peaked type, and implie…
Fast Low Energy Reconstruction using Convolutional Neural Networks
本文提出利用卷积神经网络实现IceCube-DeepCore中微子事件的快速低能重建，以提高中微子振荡参数测量的精度。
The latest IceCube data suggest that the all-flavor cosmic neutrino flux may be as large as 10^-7 GeV/cm^2/s/sr around 30 TeV. We show that, if sources of the TeV-PeV neutrinos are transparent to gamma rays with respect to two-photon annihilation, strong tensions with the isotropic diffuse gamma-ray background measured by Fermi are unavoidable, independently of the production mechanism. We further show that, if the IceCube neutrinos have a photohadronic (pgamma) origin, the sources are expected to be opaque to 1-100 GeV gamma rays. With these general multimessenger arguments, we find that the …
The IceCube DeepCore is a dense infill array of the IceCube Neutrino Observatory at the South Pole. While IceCube is best suited for detecting neutrinos with energies of several 100 GeV and above, DeepCore allows to probe neutrinos with lower energies. We focus on a sample of neutrinos with energies above approximately 10 GeV, which was originally optimised for oscillation experiments. Recently, it has been adapted to enable searches for transient sources of astrophysical neutrinos in the sky. In particular, this low-energy dataset can be used to conduct follow-up searches of gravitational wav…
IceCube expectations for two high-energy neutrino production models at active galactic nuclei
本文确定了Koers & Tinyakov（KT）和Becker & Biermann（BB）两个典型的活动星系核扩散中微子流模型参数空间的当前允许区域。我们观测到的是在86弦冰立方探测器中预期的上行μ介子中微子的数量，经过5年的暴露，范围为10^5 <E/GeV <10^8。我们已经使用了最新估计的发现潜力的冰立方-86阵列在5西格玛水平，以确定该地区的下边界，而对于上边界，我们已经使用了AMANDA上限的中微子通量或最近的初步上限由半完成的冰立方-40阵列（IC40）。我们改变了所提出的幂律通量的光谱指数α和BB模型的两个参数：中微子和宇宙射线的增强因子之间的比值Gamma_nu/Gamma_{CR}，以及对宇宙射线通量有贡献的源的最大红移zCRmax。对于KT模型，我们考虑了两种情况：一种是活动星系核的数密度不随红移的变化而变化，另一种是活动星系核的数密度随恒星形成率的变化而变化。使用IC40上限，我们发现模型在IceCube-86中仅在参数空间的非常薄的条带内可见，并且在从宇宙射线数据拟合获得的α = 2.7的优选值处，它们都被丢弃。较低的alpha值，特别是文献中提出的值2.0和2.3，表现更好。此外，我们还分析了IceCube-86在参数空间的小区域内区分模型的能力，其中两者都给出了可检验的预测。在这些区域内，保证5西格玛或更高水平的歧视。
Galactic cosmic rays reach energies of at least several PeV, and their interactions should generate $γ$-rays and neutrinos from decay of secondary pions. Therefore, Galactic sources have a guaranteed contribution to the total high-energy cosmic neutrino flux observed by IceCube. Assuming that the highest energy $γ$-rays are pionic, promising neutrino source candidates have been identified based on their spectra, and observing them is likely over the lifetime of the IceCube experiment. Here, we present the search for Galactic sources of high-energy cosmic neutrinos by focusing on sources identi…
Supernova Search with the AMANDA / IceCube Detectors
自1997年以来，位于地理南极的中微子望远镜AMANDA一直在监测我们银河系的超新星中微子爆发。2004年引入了触发器，向超新星预警系统SNEWS提交爆发候选者。从2007年开始，对爆发的搜索扩展到了更大的冰立方望远镜，它现在取代了AMANDA。通过利用南极冰中的低光电倍增管噪声（冰立方平均为280 Hz），可以通过脉冲率的集体上升来识别来自附近超新星的中微子爆发。虽然只是一个计数实验，冰立方将提供世界上最精确的测量银河系中心附近中微子爆发的时间剖面。中微子的特性，如θ 13混合角和中微子的层次的敏感性进行了讨论，以及检测的可能性去质子化爆发。
IceCube's convex all-sky neutrino spectrum consistent with the magnetically powered corona scenario for active galactic nuclei
IceCube观测到的中微子谱与活动星系核磁力驱动日冕模型一致，支持NGC 1068作为中微子活跃源的潜力。
Recent results of cosmic-ray studies with IceTop at the IceCube Neutrino
本研究利用南极IceCube观测站的表面探测器IceTop与冰中探测器的符合数据，重建不同原初质量宇宙线能谱以探究其起源，同时公布了最新实验结果及IceTop升级、IceCube-Gen2表面阵列的研究前景。
The Indirect Search for Dark Matter with IceCube
我们重新审视了冰立方和类似的大规模望远镜的前景，以检测中微子产生的弱相互作用的大质量暗物质粒子（WIMPs）在太阳中的湮灭。我们强调，问题的天体物理学是理解的;模型可以被观察到，或者，排除。在寻找与普通物质具有自旋无关相互作用的WIMP时，IceCube只有在WIMP质量足够大的情况下才能与直接检测实验竞争。对于自旋相关的相互作用，IceCube已经将自旋相关的WIMP截面的最佳限制提高了两个数量级。这在很大程度上是由于这样一个事实，即具有显着的自旋依赖耦合到质子的模型是最少的限制，同时，最有希望的，因为有效地捕获太阳中的WIMP。我们确定的模型中，暗物质粒子是超出任何计划的直接探测实验，而中微子望远镜的范围内。总之，我们发现，即使考虑到最近的直接探测结果，中微子望远镜有机会在寻找粒子暗物质方面发挥重要的补充作用。
The Antarctic Impulsive Transient Antenna (ANITA) collaboration has reported a total of three neutrino candidates from the experiment's first three flights. One of these was the lone candidate in a search for Askaryan radio emission, and the others can be interpreted as tau-neutrinos, with important caveats. Among a variety of explanations for these events, they may be produced by astrophysical transients with various characteristic timescales. We test the hypothesis that these events are astrophysical in origin by searching for IceCube counterparts. Using seven years of IceCube data from 2011…
Multi-Messenger Astrophysics with IceCube
立方千米的冰立方中微子望远镜目前在南极以接近完整的配置运行，对银河系和银河系外宇宙射线加速器以前所未有的灵敏度观察中微子天空。在多信使框架内，冰立方提供了独特的能力，将中微子天空与伽马射线天空和超高能宇宙射线相关联和对比，并补充了其他间接和直接的暗物质搜索计划。我们在这里回顾的实验和最近选定的结果的状态。在讨论了观测的影响之后，将展望未来的发展，大幅度扩大观测站在极高能量、在GZK区域和在低能量的范围，提高探测南部天空中暗物质和宇宙射线源的能力。
Neutrino searches with the IceCube telescope
冰立方中微子观测站是一个由5,160个光电倍增管（PMT）组成的阵列，部署在南极冰层内1.5-2.5公里深处的86根弦上。冰立方实验的主要目标是探测天体物理学中微子信号。在这篇文章中，我们提出了从2008年4月到2011年5月的数据点源分析的结果，当三个探测器配置操作：40串配置（IC-40），59串配置（IC-59）和79串配置（IC-79）。没有显着过量指示点源的中微子已被发现，我们提出的上限为$E^{-2}$ μ子中微子通量的候选来源列表。在天空的某些部分，这些极限第一次开始达到$10^{-12}$ TeV $^{-1}$ cm $^{-2}$ s $^{-1}$。
Recent studies with IceCube have shown signs of a time-integrated flux of astrophysical neutrinos from point-like sources such as TXS 0506+056 and NGC 1068. Time-variability of this neutrino emission from TXS 0506+056 has been studied extensively by assuming a temporal profile of the possible flare(s) or searching for temporal neutrino correlation with other electromagnetic counterparts. However, experimental evidence of the temporal profile of an astrophysical neutrino signal, besides the TXS 0506+056 source, remains lacking. In this study, we present a new KS-test based method for investigat…
Directional correlations between UHECRs and neutrinos observed with IceCube
能量阈值在几十EeV以上的超高能宇宙射线（UHECR）由于星际磁场的作用可能只会发生很小的偏转。它们的到达方向将指向可能的强子加速过程的区域，这些区域也可能是高能中微子的来源。为了寻找这样的宇宙加速器，我们在这里提出的第一个高统计分析的中微子候选人从冰立方天文台和UHECR事件之间的方向相关性。冰立方在22个弦的配置中获得的数据为使用皮埃尔俄歇天文台和HiRes实验的已发表事件作为参考方向寻找中微子的符合提供了基础。根据严格的盲性标准对分析进行了优化，结果显示在UHECR方向附近有过量的中微子候选者，其随机波动发生的概率为1%，与背景假设一致。在展望中讨论了这种分析的扩展，以包括更新的IceCube数据，采用40个字符串并使用可能性方法。
Since the end of the eighties and in response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with a solar flare, solar neutrino detectors have searched for solar flare signals. Neutrinos from the decay of mesons, which are themselves produced in collisions of accelerated protons with the solar atmosphere, would provide a novel window on the underlying physics of the acceleration process. For our studies we focus on the IceCube Neutrino Observatory, a cubic kilometer neutrino detector located at the geographical South Pole. Due to its Supernova data…
Supernova Neutrino Detection with IceCube
IceCube于2010年12月完工。它形成了一个由5160个光电倍增管组成的网格，用于监测南极冰层深处约1立方公里的体积，以获取粒子诱导光子。该望远镜被设计用于探测能量大于100 GeV的中微子。由于冰的温度低于冰点，光电倍增管的暗噪声率特别低。因此，冰立方也可以通过观察所有光电倍增管速率在暗噪声之上的集体上升来检测大量MeV中微子。IceCube具有2毫秒的时间分辨率，可以跟踪超新星中微子爆发时间发展的微妙特征。对于银河系中心的超新星，它的灵敏度与无背景的百万吨级超新星搜索实验相匹配。在银河系边缘（30千秒差距）的灵敏度降低到20个标准差，在大麦云云（50千秒差距）的灵敏度降低到6个标准差。冰立方正在向超新星预警系统发送潜在超新星的触发器。中微子的敏感性，如中微子的层次结构进行了讨论和模拟诱人的签名，如形成一个夸克星或黑洞以及冲击波的特点。所有结果都是初步的。
Prospective Sensitivity to Solar Dark Matter using the IceCube Upgrade
本文预测IceCube升级阵列对太阳暗物质湮灭产生的中微子信号的探测灵敏度，覆盖3 GeV至500 GeV暗物质质量范围，表明其将成为3 GeV至10 TeV区间最灵敏的间接暗物质探测实验。
We present a range of unbroken power-law fits to the astrophysical-neutrino spectrum consistent with the most recent published IceCube data at the 68\% confidence level. Assuming that the neutrinos originate in decays of pi mesons, we estimate accompanying gamma-ray fluxes for various distributions of sources, taking propagation effects into account. We then briefly discuss existing experimental results constraining PeV to EeV diffuse gamma-ray flux and their systematic uncertainties. Several scenarios are marginally consistent both with the KASKADE and CASA-MIA upper limits at (10^15-10^16) e…
Physics Capabilities of the IceCube DeepCore Detector
IceCube-DeepCore是一个紧凑的切伦科夫探测器，位于IceCube中微子望远镜底部中心的透明冰中。其目的是提高冰立方对低中微子能量（< 1 TeV）的灵敏度，并将冰立方的探测阈值降低约一个数量级，降至10 GeV以下。探测器由6个额外的360个高量子效率光电管串和7个中央冰立方串组成。灵敏度的提高将提供更高的灵敏度，以探测直接实验未涵盖的暗物质模型的一系列参数。它为大气中微子振荡测量μ子中微子消失或τ中微子出现在以前实验没有很好测试的能量区域打开了一个新的窗口，并在寻找潜在中微子源时将IceCube的视野扩大到全天空观测。2009年1月成功安装了第一根管柱，计划于2010年初调试整个探测器。
Extending SkyLLH software for neutrino point source analyses with 10 years of IceCube public data
本研究扩展了开源Python工具SkyLLH，新增易用模块化功能，可借助10年IceCube公开数据开展全天区中微子点源搜索，提供教程支持，能复现此前IceCube公开数据相关论文结果，与NGC 1068等源的已发表测量结果高度吻合。
High-Energy Neutrino Astronomy: Status and prospects for cosmic-ray physics
随着南极第一座千米3级中微子望远镜（冰立方）的建成和地中海第一座海底中微子望远镜（安纳托利亚）的成功运行，中微子天文学进入了一个激动人心的时期。新一代实验的灵敏度已经达到了从天体物理学来源探索中微子通量预测的至少一部分所需的水平，使中微子天文学处于首次发现的边缘。这篇文章介绍了中微子望远镜的现状和最新结果，特别强调了与高能宇宙射线现象学的联系。
In this contribution we summarize the selected highlights of IceCube in the domain of high-energy astrophysics and particle physics. We discuss the highest-energy neutrino detection and its interpretation after 4 years of data. The significance is such that the discovery of a non terrestrial component can be claimed but its origin is not yet clarified. The high energy non-atmospheric component is seen also in other analyses with smaller significance, for instance when using muon neutrino induced events coming from the Northern hemisphere. Flavor mixing is probed along cosmic distances in an an…
New Measurement of Muon Neutrino Disappearance from the IceCube Experiment
本研究利用IceCube天文台2012至2021年的数据，采用卷积神经网络进行事件重建，分析了能量低于100 GeV的大气缪子中微子消失现象并给出了初步结果。
Recent neutrino oscillation result with the IceCube experiment
本文介绍了IceCube实验利用CNN重建DeepCore探测器中微子样本，进行大气缪中微子消失分析，并与全球测量结果比较，提升了物理灵敏度。
The IceCube Neutrino Observatory provides the opportunity to perform unique measurements of cosmic-ray air showers with its combination of a surface array and a deep detector. Electromagnetic particles and low-energy muons ($\sim$GeV) are detected by IceTop, while a bundle of high-energy muons ($\gtrsim$400 GeV) can be measured in coincidence in IceCube. Predictions of air-shower observables based on simulations show a strong dependence on the choice of the high-energy hadronic interaction model. By reconstructing different composition-dependent observables, one can provide strong tests of had…
12-Years Observation of Seasonal Variation of Atmospheric Neutrino Flux with IceCube
利用冰立方12年数据，更新大气中微子通量季节变化分析，确认南半球斜率参数与理论预测的张力（>3σ），并首次观测北半球季节变化，发现相关性弱于预期且偏离线性关系。
H.E.S.S. realtime follow-ups of IceCube high-energy neutrino alerts
本研究概述了H.E.S.S.在2021-2022年对IceCube中微子警报的实时跟进，重点发现PKS 0625-35与三个中微子的显著巧合，验证了多信使观测的重要性。
While the Standard Model has experienced great predictive success, the neutrino sector still holds opportunities for surprises. Numerous ongoing and planned experiments exist to probe neutrino properties at low energies. The IceCube Neutrino Observatory, comprised of over 5000 photomultiplier tubes (PMTs) situated in a cubic-kilometer of ice at the geographic South Pole, lies in a unique position to measure neutrinos at energies of a TeV and higher. In these proceedings, I discuss several exciting particle physics measurements using IceCube data and probes of physics beyond the Standard Model.
Tau neutrino identification with the IceCube experiment would open new windows to neutrino physics as well as enable novel searches for cosmic neutrino sources. This work aims at a identification of tau neutrinos with astrophysical origin at energies above 100TeV. For identification, we search for a double pulse structure in the signal of one of IceCubes Digital Optical Modules originating from a tau neutrino interaction and a subsequent tau decay within the detector. In this work, we present constraints on the tau neutrino flux based on an event sample with a livetime of about 7.5 years of Ic…
The latest results from the ANTARES Neutrino Telescope are reported. Limits on a high energy neutrino diffuse flux have been set using for the first time both muon-track and showering events. The results for point sources obtained by ANTARES are also shown. These are the most stringent limits for the southern sky for neutrino energies below 100 TeV. Constraints on the nature of the cluster of neutrino events near the Galactic Centre observed by IceCube are also reported. In particular, ANTARES data excludes a single point-like neutrino source as the origin of this cluster. Looking for neutrino…
The next generation of the IceCube Neutrino Observatory, IceCube-Gen2, will constitute a much larger detector, increasing the rate of high-energy neutrinos. IceCube-Gen2 will address the long-standing questions about astrophysical accelerators. The experiment will also include a surface air-shower detector which will allow for measurements of cosmic rays in the energy region where a transition between Galactic and extragalactic accelerators is expected. As a baseline design for the surface detector, we consider a surface array above the optical in-ice array consisting of the same type of stati…
In light of the latest IceCube data, we discuss the implications of the cosmic ray energy input from hypernovae and supernovae into the Universe, and their propagation in the hosting galaxy and galaxy clusters or groups. The magnetic confinement in these environments may lead to efficient $pp$ collisions, resulting in a diffuse neutrino spectrum extending from PeV down to 10 TeV energies, with a spectrum and flux level compatible with that recently reported by IceCube. If the diffuse 10 TeV neutrino background largely comes from such the CR reservoirs, the corresponding diffuse gamma-ray backg…
The origin of neutrino flux observed in IceCube is still mainly unknown. Typically two flux components are assumed, namely: atmospheric neutrinos and an unknown astrophysical term. In principle the latter could also contain a top-down contribution coming for example from decaying dark matter. In this case one should also expect prompt and secondary gammas as well. This leads to the possibility of a multimessenger analysis based on the simultaneous comparison of the Dark Matter hypothesis both with neutrino and high energy gamma rays data. In this paper, we analyze, for different decaying Dark …
A signal of high-energy extraterrestrial neutrinos from unknown source(s) was recently discovered by the IceCube experiment. Neutrinos are always produced together with gamma-rays, but the gamma-ray flux from extragalactic sources is suppressed due to attenuation in the intergalactic medium. We report the discovery of a gamma-ray excess at high Galactic latitudes starting at energies 300 GeV in the data of the Fermi telescope. We show that the multi-TeV gamma-ray diffuse emission has spectral characteristics at both low and high Galactic latitudes compatible with those of the IceCube high neut…
Dark matter particles in the galactic halo can scatter off particles in celestial bodies such as stars or planets, lose energy and become gravitationally trapped. In this process, an accumulation of dark matter in the center of celestial bodies is expected, for example, at the center of the Earth. If dark matter self-annihilates into Standard Model particles, the end products of these annihilations include neutrinos. The IceCube Neutrino Observatory at the geographic South Pole can detect the resulting flux of neutrinos originating from dark matter annihilation in the center of the Earth. A se…
New physics in neutrino sector can reveal itself via non-standard neutrino interactions which can result in modification of the standard picture of neutrino propagation in matter. Experiments with atmospheric neutrinos has been used to probe this scenario. Using publicly available three-year low energy data in IceCube DeepCore we place bounds on the parameters $ε_{αβ}$ of non-standard neutrino interactions in propagation. We obtain restrictive constraints not only for $μτ$ sector but also for flavor changing interactions involving electron neutrinos.
Recent LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. Interestingly, this new particle might be both CP odd and play the role of a portal into the dark matter sector. Under these assumptions and motivated by the fact that the requirement of $SU(2)_L$ invariance automatically implies the coupling of this alleged new resonance to $ZZ$ and $Zγ$, we investigate the current and future constraints coming from the indirect searches performed through the neutrino telescope IceCube. We show that these constraints can be stronger than the ones from d…
IceCube is a cubic-kilometer Cherenkov telescope operating at the South Pole. Its goal is to detect astrophysical neutrinos and identify their sources. High-energy muon neutrinos are identified through the secondary muons produced via charge current interactions with the ice. The present best-performing directional reconstruction of the muon track is a maximum likelihood method which uses the arrival time distribution of Cherenkov photons registered by the experiment's photomultipliers. Known systematic shortcomings of this method are to assume continuous energy loss along the muon track, and …
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