Description
Conveners:
Summer Blot (DESY)
Pau Novella (IFIC)
Davide Sgalaberna (ETH)
Jessica Turner (Durham University)
Contact: eps23-conveners-t04 @desy.de
Borexino is a 280-ton liquid scintillator detector that took data from May 2007 to October 2021 at Laboratori Nazionali del Gran Sasso in Italy. Thanks to the unprecedented radio-purity of the detector, the real time spectroscopic measurement of solar neutrinos from both the pp chain and CNO fusion cycle of the Sun has been performed. Borexino also reported the first directional measurement of...
KATRIN is probing the effective electron anti-neutrino mass by a precise measurement of the tritium beta-decay spectrum near its kinematic endpoint. Based on the first two measurement campaigns a world-leading upper limit of 0.8 eV (90% CL) was placed. New operational conditions for an improved signal-to-background ratio, the steady reduction of systematic uncertainties and a substantial...
The smallness of neutrino masses is one of the most intriguing puzzles in the context of particle physics. One of the most natural ways to introduce naturally suppressed masses is the construction of dimension-5 effective operators, called Weinberg operators. In the presence of only the standard Higgs scalar doublet, these kinds of operators arise in the three usual seesaw models. In this...
We discuss a TeV scale extension of the Standard Model in which a dark sector seeds neutrino mass generation radiatively within the linear seesaw mechanism. Since symmetry prevents tree-level contributions, tiny neutrino masses are generated at one-loop from spontaneous lepton number violation by the small vacuum expectation value of a Higgs triplet. The model can have sizeable rates for...
I will present some of the results obtained regarding the emergence of decoherence in neutrino oscillations. In our model all the particles, including the source and detector, are treated dynamically and evolved consistently with Quantum Field Theory; decoherence can emerge naturally given the time evolution of the initial state and the final state considered.
We have shown that some of...
T2K is a long baseline neutrino experiment which exploits a neutrino and antineutrino beam produced at the Japan Particle Accelerator Research Centre (J-PARC) to provide world-leading measurements of the parameters governing neutrino oscillation. Neutrino oscillations are measured by comparing neutrino rates and spectra at a near detector complex, located at J-PARC, and at the water-Cherenkov...
The NOνA experiment is a long-baseline, off-axis neutrino experiment that aims to study the mixing behavior of neutrinos and antineutrinos using the Fermilab NuMI neutrino beam near Chicago, IL. The experiment collects data at two functionally identical detectors, the Near Detector is near the neutrino production target at Fermilab; the 14 kt Far Detector is 810 km away in Ash River, MN. Both...
In the current epoch of neutrino physics, many experiments are aiming for precision measurements of oscillation parameters. Thus, various new physics scenarios which alter the neutrino oscillation probabilities in matter deserve careful investigation. Recent results from NOvA and T2K show a slight tension on their reported values of the CP violating phase $\delta_{CP}$. Since the baseline of...
We report on the latest measurement of atmospheric neutrino oscillation parameters using data from the IceCube Neutrino Observatory. The DeepCore array in the central region of IceCube enables the detection and reconstruction of atmospheric neutrinos at energies as low as $\sim5$ GeV. This energy threshold allows the measurement of muon neutrino disappearance over a wide range of baselines...
The Super-Kamiokande experiment (Super-K) is a water Cherenkov detector in Japan. It has been collecting atmospheric neutrino events in ultrapure water from 1996 to 2020, after which it was upgraded with the addition of Gadolinium sulfate in the water. Tau neutrinos are not expected in the atmospheric neutrino flux below 10 GeV unless they appear from the oscillation of atmospheric muon...
The Daya Bay reactor neutrino experiment is the first experiment that measured a non-zero value for the neutrino mixing angle $\theta_{13}$ in 2012. Antineutrinos from six 2.9 GW$_{\text{th}}$ reactors were detected in eight identically designed detectors deployed in two near and one far underground experimental halls. The near-far arrangement in km-scale baselines of anti-neutrino detectors...
The near detector of T2K (ND280) is undergoing a major upgrade. A new scintillator tracker, named superFGD, with fine granularity and 3D-reconstruction capabilities has been assembled at J-PARC. The new Time Projection Chambers are under construction, based on the innovative resistive Micromegas technology and a field cage made of extremely thin composite walls. New scintillator panels with...
The Deep Underground Neutrino Experiment (DUNE) is a next generation long baseline neutrino experiment for oscillation physics and proton decay studies. The primary physics goals of the DUNE experiment are to perform neutrino oscillation physics studies, search for proton decay, detect supernova burst neutrinos, make solar neutrino measurements and BSM searches. The liquid argon prototype...
The ESSnuSB project aims to measure the leptonic CP violation at the second neutrino oscillation maximum using an intense neutrino beam, which will be produced by the powerful ESS proton linear accelerator. The first phase of the project was successfully concluded with the production of the Conceptual Design Report in which it was shown that this next-to-next generation neutrino oscillation...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton multi-purpose liquid scintillator detector under construction in a 700-meter underground laboratory in China. With its excellent energy resolution, sizeable fiducial volume, and remarkable background control, JUNO presents unique prospects to explore many important topics in neutrino and astroparticle physics.
By measuring...
The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose experiment, which is under construction in South China. Thanks to the 20 ktons of ultra-pure liquid scintillator (LS), JUNO will be able to perform innovative and groundbreaking measurements like the determination of neutrino mass ordering (NMO). Beyond NMO, JUNO will measure the three neutrino oscillation parameters with...
LiquidO is a new neutrino detection technology which uses opaque liquid scintillator with a very short scattering length and an intermediate absorption length. Reducing the scattering length down to the scale of millimetres causes the light to be confined to a few cm radius near its creation point. To extract the light a lattice of wavelength-shifting fibres runs through the scintillator. This...
Supernova (SN) explosions provide a perfect environment to produce and therefore test hypothetical particles. SN1987a gave a possibility to set a number of constraints on FIPs parameters using the energy-loss argument and further development of neutrino detectors extends those possibilities. I will discuss, how SN-produced FIPs may create detectable signatures that can significantly improve...
We present a method to verify Mikheyev-Smirnov-Wolfenstein effect during the propagation of SN neutrinos from the SN core to the Earth. The non-MSW scenario to be distinguished from the MSW one is the
incoherent flavor transition probability for neutrino propagation in the vacuum. Our approach involves studying time evolution of neutrino event rates in liquid Argon, liquid scintillation and...
FASER, the ForwArd Search ExpeRiment, is an LHC experiment located 480 m downstream of the ATLAS interaction point, along the beam collision axis. One main physics goal of FASER and its sub-detector FASERnu is to detect and study TeV-energy neutrinos, the most energetic neutrinos ever detected from a human-made source. FASER is taking data since the start of LHC Run 3 in July 2022. This talk...
SND@LHC is a compact and stand-alone experiment to perform measurements with neutrinos produced at the LHC in a hitherto unexplored pseudo-rapidity region of 7.2 < 𝜂 < 8.6, complementary to all the other experiments at the LHC. The experiment is located 480 m downstream of IP1 in the unused TI18 tunnel. The detector is composed of a hybrid system based on a 800 kg target mass of tungsten...
Measurements of Numu Charged Current Pion Production on different nuclei in the delta(1232) resonance region are an important interaction process for accelerator-based neutrino oscillation experiments. Here we present new high statistics differential cross section measurements of pi plus and pi zero production on scintillator, carbon, water, iron, and lead targets recorded by the MINERvA...
Precise knowledge of how neutrinos interact with matter is essential for measuring neutrino oscillations in long-baseline experiments. At the T2K experiment, the near detector complex measures neutrino interactions to constrain cross section models for oscillation studies and characterises the beam flux. In addition, the near detector complex provides a separate platform for performing...
Long-baseline (LBL) neutrino oscillation experiments search for Charge-Parity (CP) violation in the leptonic sector by precisely measuring the $\nu_\mu\to\nu_e$ and $\overline{\nu}_\mu\to\overline{\nu}_e$ appearance probabilities.
One of the dominant systematic uncertainties on the measurements of CP violation, comes from our modeling of the $\nu_e/\overline{\nu}_e$ cross-section ratio, which...
The MicroBooNE liquid argon time projection chamber (LArTPC) experiment operated in the Fermilab Booster Neutrino and Neutrinos at the Main Injector beams from 2015-2021. Among the major physics goals of the experiment is a detailed investigation of neutrino-nucleus interactions. MicroBooNE currently possesses the world's largest neutrino-argon scattering data set, with 8 published...
ProtoDUNE Single-Phase is a 700-ton liquid argon detector operated in the CERN Neutrino Platform from 2018 to 2020. It is part of the Deep Underground Neutrino Experiment (DUNE), a long-baseline neutrino oscillation experiment with a 40 kT liquid argon far detector to be built at the Sanford Underground Research Facility and a near detector, with both argon and non-argon detector technologies,...
Neutrinos are unique tools to probe new physics scenarios such as non-standard interactions (NSIs) of neutrinos with matter. The coupling of neutrinos to a scalar field gives rise to a new interaction known as Scalar NSI. Unlike the vector NSI case, which contributes to the usual matter potential, the scalar NSI appears as a correction to the neutrino mass term. In this work, we perform a...
The DsTau experiment at CERN-SPS has been proposed to measure an inclusive differential cross-section of a Ds production with a consecutive decay to tau lepton in p-A interactions. A precise measurement of the tau neutrino cross section would enable a search for new physics effects such as testing the Lepton Universality (LU) of Standard Model in neutrino interactions. The detector is...
A rich cross-section and "beyond the Standard Model" (BSM) search programme will be served by the intense $\nu_e$ and $\nu_\mu$ beams that will be provided by the neutrinos from stored muons (nuSTORM) facility. Exceptional precision in cross section measurement and exquisite sensitivity in BSM searches are afforded at nuSTORM by the precise knowledge of the flavour composition and energy...
Monitored neutrino beams represent a powerful and cost effective tool to suppress cross section related systematics for the full exploitation of data collected in long baseline oscillation projects like DUNE and Hyper-Kamiokande. In the last years the NP06/ENUBET project has demonstrated that the systematic uncertainties on the neutrino flux can be suppressed to 1% in an accelerator based...
This talk presents the latest results of the reactor antineutrino flux and spectrum measurement at Daya Bay. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. From December 2011 to December 2020,...
The KArlsruhe TRItium Neutrino (KATRIN) experiment is designed to determine the mass of the electron antineutrino by kinematic measurements of the tritium beta-decay with a target sensitivity of 0.2 eV$/c^2$ (90\% C.L.). In 2022, KATRIN reported the most stringent limit on the neutrino mass with $m_\nu < 0.8$ eV$/c^2$ (90$\%$ C.L) based on data acquired during the first two science runs of...
The MicroBooNE experiment utilizes an 85-ton active volume liquid argon time projection chamber (LArTPC) neutrino detector. It can distinguish between photons and electron electromagnetic showers and can select charged current electron neutrino and muon neutrino events with exceptional performance. In this talk, we will presentresults on MicroBooNE's investigation of the MiniBooNE Low Energy...
The latest results of the DANSS experiment are presented. The plastic scintillator detector is located under 3.1 GW industrial reactor core of Kalinin Nuclear Power Plant, and its main purpose is the search for the short baseline neutrino oscillations. The inverse beta decay reaction is used for the antineutrino detection. The data are collected at three distances – 10.9, 11.9 and 12.9 meters...
The Short-Baseline Near Detector (SBND) will be one of three Liquid Argon Time Projection Chamber (LArTPC) neutrino detectors positioned along the axis of the Booster Neutrino Beam (BNB) at Fermilab, as part of the Short-Baseline Neutrino (SBN) Program. The detector is anticipated to begin operation later this year. SBND is characterized by superb imaging capabilities and will record over a...
The ICARUS collaboration has employed the 760-ton T600 detector in a successful three-year physics run at the underground LNGS laboratory, performing a sensitive search for LSND-like anomalous $\nu_e$ appearance in the CNGS beam, contributing to the constraints on the allowed neutrino oscillation parameters to a narrow region around 1 eV$^2$. After a significant overhaul at CERN, the T600...
We present an updated and improved global fit analysis of current flavor and electroweak precision observables to derive bounds on unitarity deviations of the leptonic mixing matrix and on the mixing of heavy neutrinos with the active flavours, which is motivated by the lastest experimental updates on key observables such as $V_{ud}$, the Z invisible width and the W mass.
The main goal of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso (LNGS, Italy) is the search for the lepton-number-violating neutrinoless double-beta ($0\nu\beta\beta$) decay of 76Ge. The potential discovery of such phenomenon would have significant implications in cosmology and particle physics, unrevealing the Majorana nature of neutrinos. The main...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for 0νββ decay that has been able to reach the one-tonne mass scale. The detector, located at the LNGS in Italy, consists of an array of 988 TeO2 crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data run in 2017 at a base temperature of...
The NEXT experiment searches for the neutrinoless double beta decay in Xe-136 using a series of detectors based on the high pressure xenon gas time projection chamber (HPXeTPC) technology. The previous stage of this family of detectors was NEXT-White, the first radiopure detector of the NEXT series, with 5kg of Xe. Its goals were a detailed assessment of the backgrounds for Xe-136 double beta...
We present an analysis of neutrinoless double beta decay (DBD) mediated by non-interfering exchange of light and heavy neutrinos, in the context of current calculations of nuclear matrix elements (NME) in different nuclear models.
We derive joint upper bounds on the light and heavy contributions to the Majorana effective mass through an updated combination of the latest data from the...
Observation of the neutrinoless double-beta ($0\nu\beta\beta$) decay, a process forbidden in the Standard Model, would demonstrate lepton number violation and provide key insights into matter-antimatter asymmetry of the Universe and the Majorana nature of neutrino. It is a challenging quest that requires experimental conditions ensuring little to no background, superb energy resolution, and...
