Descripción
Simulation, reconstruction techniques, machine learning/NNs/BDTs, likelihoods, strategies, computing, software, data formats, virtual observatories
This session is distributed in multiple rooms along the week:
Tue:
- VLVnT 2021 | Parallel Session Room A: https://cern.zoom.us/j/62997581748
- VLVnT 2021 | Parallel Session Room E: https://cern.zoom.us/j/68700031104
Wed:
- VLVnT 2021 | Parallel Session Room A: https://cern.zoom.us/j/62997581748
Thu:
- VLVnT 2021 | Parallel Session Room A: https://cern.zoom.us/j/62997581748
- VLVnT 2021 | Parallel Session Room B: https://cern.zoom.us/j/68306216278
Fri:
- VLVnT 2021 | Parallel Session Room D: https://cern.zoom.us/j/63734092003
Click on each contribution for details
An accurate atmospheric neutrino flux is crucial for a multitude of physics studies with modern neutrino telescopes; as a signal for neutrino oscillation measurements, and as a background for searches of astrophysical neutrino sources. We seek to advance in the low-energy neutrino flux calculations (up to a few GeV) using the MCEq (Matrix Cascade Equations) code that numerically solves the...
The Baikal-GVD neutrino telescope is currently a multi-cluster infrastructure composed by 7 separately operating clusters of more than 2000 photosensitive modules in lake Baikal. Single cluster comprises 8 strings of 288 optical modules by means of 36 OM on each string divided into three groups (sections) of 12-channel control modules with ADCs. Two independent systems of time synchronization...
KM3NeT is a deep-sea infrastructure composed of two neutrino telescopes being deployed in the Mediterranean Sea : ARCA, near Sicily in Italy, designed for neutrino astronomy and ORCA, near Toulon in France, designed for the study of atmospheric neutrino oscillations. These two telescopes are 3D arrays of optical modules used to detect the Cherenkov radiation, which is a signature of charged...
The gSeaGen framework has been upgraded to simulate events detectable in neutrino telescopes induced by neutrino or cosmic ray interactions. The new version is well-suited to generate neutrino interactions at energies from a few MeV to EeV, profiting from the latest GENIE extensions to lower and higher energies. In addition, a brand new functionally to propagate leptons from CORSIKA air...
The simulation of the neutrino interaction vertex is a crucial step for the simulation chain of a neutrino experiment. The different processes taking part in the neutrino scattering at a nucleus require several approximations in order to make the simulation possible and to realize reasonable computation times. This can be realised in different ways, e.g. by parametrised models for the...
Bouke Jung$^1$, Maarten de Jong$^2$, Paolo Fermani$^3$
on behalf of the KM3NeT collaboration
$^1$) University of Amsterdam, Nikhef
bjung@nikhef.nl
$^2$) Leiden University, Nikhef
mjg@nikhef.nl
$^3$) Sapienza Università di Roma
paolo.fermani@roma1.infn.it
Present and foreseen neutrino observatories, such as IceCube, P-ONE, GVD, Antares and KM3NeT have to operate in challenging environments,...
With neutrino astronomy on the rise, calibration aspects of large-volume detectors are becoming one of the key targets to boost detector performance. In the scope of the IceCube Upgrade planned for the South Pole season of 2022/23, we developed a novel isotropic, self-monitoring, precision calibration light source aimed for use in large-volume detectors in order to boost understanding of the...
Baikal-GVD is a gigaton-scale neutrino observatory under construction in Lake Baikal. It currently produces about 100GB of data every day. For their automatic processing, the Baikal Analysis and Reconstruction software (BARS) was developed. At the moment, it includes such stages as a hit extraction from PMT waveforms, assembling events from raw data, assigning timestamps to events, determining...
Waveform unfolding, in which photomultiplier tube signals are expressed as a linear combination of single-photoelectron waveforms, is a useful processing method both for analysis and for data compression in the IceCube Neutrino Observatory. This processing is currently only possible with a cluster of computers on the surface, but improvements in embedded technology allow moving this analysis...
The ANTARES neutrino telescope is operating in the Mediterranean Sea in its full configuration since 2008. On their journey to the Earth, cosmic rays (CRs) can be absorbed by celestial objects, like the Sun, leading to a deficit in secondary muons produced by CR interactions from the solid angle region covered by the Sun, the so-called Sun "shadow" effect. This phenomenon can be used to...
The main purpose of the Baikal-GVD Data Quality Monitoring (DQM) system is to verify the detector status and collected data in both on- and off-line modes. Besides the quality estimation of the obtained data and providing the charge calibration using recorded signals the system efficiently performs validation of the trigger thresholds, as well as the monitoring of the environmental noise...
We present the results of a one year monitoring of absorption and scattering lengths of light with wave length 375÷532nm within the effective volume of the
Baikal-GVD deep underwater neutrino telescope. The measurements were
performed using a dedicated device, BAIKAL-5D, which was installed
during the 2020 winter expedition at a depth 1250 m. The device has a shaded point-like isotropic...
Baikal-GVD is a gigaton volume neutrino telescope currently under construction in Lake Baikal. GVD's detection, calibration and control units are submerged between the depths of 730 and 1275 meters and are equipped with sensors allowing for monitoring the state of individual components. Spatial configuration of the entire detector is obtained using an acoustic positioning system consisting of...
The IceCube Neutrino Observatory, located under 1.4 km of Antarctic ice,
instruments a cubic kilometer of ice with 5,160 optical modules that detect
Cherenkov radiation originating from neutrino interactions. The more
densely instrumented center, DeepCore, aims to detect atmospheric neutrinos
at 10-GeV scales to improve important measurements of fundamental neutrino
properties such as the...
The
IceCube Neutrino Observatory is designed to observe neutrinos interacting deep within the South Pole ice. It consists of 5,160 digital optical modules, which are arrayed over a cubic kilometer from 1,450 m to 2,450 m depth. At the lower center of the array is the DeepCore subdetector. It has a denser configuration which lowers the observable energy threshold to about 10 GeV and creates...
The Baikal-GVD is a large scale neutrino telescope being constructed in Lake Baikal. The majority of signal detected by the telescope are noise hits, caused primarily by the luminescence of the Baikal water. Separating noise hits from the hits produced by Cherenkov light emitted from the muon track is a challenging part of the muon event reconstruction. We present an algorithm that utilizes a...
Muon track reconstruction methods developed for Baikal-GVD detector
and their performance are discussed in this talk. This includes
methods for the rejection of noise due to water chemilumenescence and
track parameter reconstruction based on chi^2 minimisation. The
performance of the algorithms is assessed using realistic Monte Carlo
(MC) simulations of the detector. Benchmark results obtained...
ANTARES is currently the largest undersea neutrino telescope, located in the Mediterranean Sea and taking data in its full configuration since 2008. It consists of a 3D array of photosensors, instrumenting about 10Mt of seawater to detect Cherenkov light induced by secondary particles from neutrino interactions. The event reconstruction and background discrimination is challenging and...
KM3NeT is constructing two large neutrino detectors in the Mediterranean Sea: KM3NeT/ARCA, located near Sicily and aiming at neutrino astronomy, and KM3NeT/ORCA, located near Toulon and designed for neutrino oscillation studies. The two detectors, together, will have hundreds of Detection Units (DUs) with 18 Digital Optical Modules (DOMs) maintained vertical by buoyancy, forming a large 3D...
Data collected by the Baikal Gigaton Volume Detector (Baikal GVD) needs to be processed in real time at a data centre located in Dubna, Moscow Oblast, approx. 4,300 km away. An infrastructure facilitating data transfer and storage was designed and implemented. In this paper, we discuss the details of the implementation and our approach to ensuring fault tolerance and 24/7 access to the data.
Detection of high energy astrophysical neutrinos is the main aim of Baikal-GVD (Gigaton Volume
Detector) neutrino experiment located in the southern part of Lake Baikal. It is a three dimensional grid of optical modules (OMs), which are attached to the vertical cables, called strings. The whole detector is sub-arranged into functionally independent units, referred to as clusters.
Highly...
The IceCube Neutrino Observatory is a cubic kilometer-sized detector designed to detect neutrinos of astrophysical origin. We discuss a new method using a boosted decision tree to classify and reduce the cosmic ray muon rates from ~billion per year to ~1 per year, the same BDT is also used to select for starting track events (~900 per year). The classification and removal of incoming muons is...
In the upcoming decades, the KM3NeT detectors will produce valuable data that can be used in various scientific contexts from astro- and particle physics to environmental and Earth and Sea science. Based on the Open Science policy established by the KM3NeT Collaboration, several efforts to offer science-ready data, foster common analysis approaches and publish open source software are...
The DeepCore sub-array within the IceCube Neutrino Observatory is a densely instrumented region of Antarctic ice designed to observe atmospheric neutrino interactions above 5 GeV via Cherenkov radiation. An essential aspect of any neutrino oscillation analysis is the ability to accurately identify the flavor of neutrino events in the detector. This task is particularly difficult at low...
The Control Unit of the KM3NeT Data Acquisition is the software suite that is responsible for operating all the components of the KM3NeT telescopes in a coordinated and scientifically proficient way. It controls a wide span of parameters and procedures, from the power supplies, to the operating voltages of more than 64000 photomultipliers in each detector block, to the setup of the various...
The detection of astrophysical $\nu_\tau$ is an important verification of the observed flux of high-energy neutrinos. A flavour ratio of $\nu_{e} : \nu_\mu : \nu_\tau \approx 1 : 1 : 1$ is predicted for astrophysical neutrinos measured at Earth due to neutrino oscillations. On top of this, the $\nu_\tau$ offers a unique channel for neutrino astronomy due to absence of an atmospheric $\nu_\tau$...
KM3NeT, a neutrino telescope currently under construction in the Mediterranean Sea, consists of a network of large-volume Cherenkov detectors. Its two different sites, ORCA and ARCA, are optimised for few GeV and TeV-PeV neutrino energies, respectively. This allows for studying a wide range of physics topics spanning from the determination of the neutrino mass hierarchy to the detection of...
The IceCube Neutrino Observatory investigates high-energy astrophysical phenomena by studying the corresponding high-energy neutrino signal. Its successful discovery of a diffuse flux of astrophysical neutrinos with energies up to the PeV scale in 2013 has triggered a vast effort to identify this signal's sources, which recently resulted in an improved analysis method. Here, we present a new...
High-energy neutrinos with energies above a few $10^{16}~$eV can be measured efficiently with in-ice radio detectors which is explored successfully in the ARIANNA test-bed detector, an array of shallow radio detector stations. Here, we demonstrate the neutrino pointing capabilities of a shallow radio station. Using the residual hole from the South Pole Ice Core Project, radio pulses were...
The KM3NeT Collaboration is constructing two deep-sea Cherenkov detectors in the Mediterranean Sea. The ARCA detector aims at TeV-PeV neutrino astronomy, while the ORCA detector is optimized for atmospheric neutrino oscillation studies at energies of a few GeV. In this contribution, an analysis of the data collected with the first deployed detection units of the ARCA detector is presented. A...
The KM3NeT Collaboration has successfully deployed the first detection units of the next generation undersea neutrino telescopes in the Mediterranean Sea at the two sites in Italy and in France. The data sample collected between December 2016 and January 2020 has been used to measure the atmospheric muon rate at two different depths under the sea level: 3.5 km with KM3NeT/ARCA and 2.5 km with...
ORCA, Oscillation Research with Cosmics in the Abyss, is the low energy KM3NeT neutrino underwater detector, located in the French Mediterranean sea. It comprises a dense array of optical modules designed to detect the emitted Cherenkov light emitted from charged particles resulting from neutrino interactions in the vicinity of the detector. Its main physics goal is the determination of the...
