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NuFact 2025 - The 26th International Workshop on Neutrinos from Accelerators

→ Europe/London
Liverpool, UK

Liverpool, UK
Description

To be held at the Spine, Liverpool, 1-6 September 2025, hosted by the University of Liverpool.

NuFact 2025 is the 26th in the series of yearly international workshops which started in 1999 and which had previously been called the International Workshop on Neutrino Factories. The change of name to International Workshop on Neutrinos from Accelerators is related to the fact that the workshop program has, over the years, come to include all current and future accelerator and reactor-based neutrino projects, while also including muon physics, not only the Neutrino Factory project.

The main goal of the workshop is to review the progress of current and future facilities able to improve on measurements of the properties of neutral and charged lepton flavour violation, as well as search for new phenomena beyond the capabilities of presently planned experiments. The workshop is both interdisciplinary and interregional in that experimenters, theorists, and accelerator physicists from all over the world share expertise with the common goal of reviewing the results of currently operating experiments and designing the next generation of experiments.

The NuFact 2025 workshop is divided into seven working groups to cover the following topics:

  • WG1 Neutrino Oscillations
  • WG2 Neutrino Scattering 
  • WG3 Accelerator Physics
  • WG4 Muon Physics
  • WG5 Neutrinos beyond PMNS
  • WG6 Detectors
  • WG7 Inclusion, Diversity, Equity, Education and Outreach

 

We welcome you to Liverpool to enjoy a lively week of physics as well as the opportunity to experience our wonderful city first hand. See you in September.

 

 

 

 

Enquiries
  • Monday 1 September
    • Registration The Spine, Liverpool

      The Spine, Liverpool
    • Welcome and Kickoff Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Christos Touramanis Douramanis (University of Liverpool (GB))
      Nufact_intro_slides.pdf
      Nufact_intro_slides.pptx
    • Plenary: Work Package Introductions Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Christos Touramanis Douramanis (University of Liverpool (GB))
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • Plenary: Work Package Introductions Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Lunch Break The Spine, Liverpool

      The Spine, Liverpool
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Dr Saskia Charity (University of Liverpool (GB))
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Dr Saskia Charity (University of Liverpool (GB))
    • Poster Session The Spine, Liverpool

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
      • 16
        A data-driven method to estimate the antiproton background in the Mu2e experiment

        The Mu2e experiment will search for the CLFV process of coherent, neutrinoless $\mu^- \rightarrow e^-$ conversion in the field of an Al nucleus. The expected signal is a 104.97 MeV monochromatic conversion electron (CE). The signature feature of Mu2e is the superconducting solenoidal magnetic system that produces a high intensity pulsed muon beam. One of the backgrounds to the CE search is antiprotons produced by the proton beam interaction with the production target, making their way to the aluminum stopping target and annihilating to produce CE-like electrons. Although not a dominant background, it has a large uncertainty and cannot be suppressed by the timing cuts used to reduce the prompt background. The systematic error is dominated by the uncertainty on the antiproton production cross section for the Mu2e proton beam energy. We have developed a novel data-driven method to estimate the antiproton background. At Mu2e energies, $\bar{p}$ annihilation is the only source of events with multiple, simultaneous particles coming from the stopping target. From Geant4 simulations, only about 0.2$\%$ of the simulated $\bar{p}$ annihilation events have a signal-like electron. Meanwhile, $\sim$ 5$\%$ of events have multiple reconstructible particle tracks. Therefore, we have devised a methodology to reconstruct the multi-track events and estimate the $\bar{p}$ background by exploiting the large ratio of the production rates of the two final states. The systematic uncertainty to this estimation stems from the uncertainty on the ratio of the two final states. This can be translated to the uncertainties on : (1) the pion multiplicity; (2) the shape of the inclusive pion momentum spectrum from $\bar{p}$ annihilation at rest. We have compared the values obtained from GEANT4 simulations to the measurements available from various past experiments. In this talk, I shall present the final results of this in-situ estimation of the $\bar{p}$ background in Mu2e.

        Speaker: Namitha Chithirasreemadam (University of Pisa)
        NamithaMu2ePosterNuFact2025.pdf
      • 17
        Collider Neutrino Studies with the FASER Electronic Detector

        The LHC offers a unique environment to study neutrinos in the intermediate energy range between those produced in fixed-target accelerator experiments and high-energy astrophysical sources. The FASER experiment takes advantage of the intense, highly collimated flux of light hadrons produced at Interaction Point 1 (IP1) to probe high-energy collider neutrinos. Using the electronic detector alone, FASER has measured the muon neutrino cross section and flux in this energy regime with unprecedented precision. With a dataset corresponding to approximately 200 fb⁻¹, further studies using only the electronic detector are underway, promising improved constraints on neutrino properties in this previously unexplored energy range.

        Speaker: Sinead Eley (University of Liverpool (GB))
        NuFact_Poster_Final.pdf
      • 18
        Creating the Buddy System: Networking Program for Large Collaboration Meetings

        The "Buddy System" Program is a networking initiative that encourages new connections between collaborators to be formed during collaboration meetings. A survey is sent before upcoming meetings, asking both in-person and virtual attendees who are interested to fill out the form to be matched with 1-2 other collaborators. Based on the responses, including a ranking system for how they want the match to be made, participants are emailed before the collaboration meeting and encouraged to set up their own coffee or zoom chat with their match during the meeting week. This program has been successfully run at 5 collaboration meetings where about 10% of the total 300 meeting attendees have been taking advantage of the program.

        Speaker: Dr Jessie Micallef (Tufts University)
        Creating the Buddy System_Micallef.pdf
      • 19
        Development of an agnostic global particle identification tool for the ND280 near detector

        Development of an agnostic global particle identification tool for the ND280 near
        detector

        Patrick Bates

        T2K is a long-baseline neutrino experiment stationed in Japan, with the primary goal of measuring $δ_{cp}$ via comparison of $ν_μ→ν_e$ and $ν^{-}_μ→ν^{-}_e$ oscillation. The ND280 off-axis near detector samples the neutrino beam before oscillation occurs, and allows for measurements of neutrino-nucleus interaction cross-sections. Selecting interaction samples in ND280 requires effective particle identification (PID) selection algorithms to select the correct charged particle tracks. However, there are limits to conventional selection methods, prompting the need for more powerful tools.

        An agnostic global PID tool has been developed for the ND280 near detector. This exploits machine learning algorithms to accomplish multivariate analysis, with a boosted decision tree (BDT) being used to develop the PID tool. This tool makes no assumption on what selection it is being used for and utilizes information from all available sub-detectors. The performance of the BDT PID tool applied to a CC1π selection will be benchmarked against the same selection using traditional cut methods. In this poster I will present work on the development of the BDT, the current status and future plans.

        Speaker: Patrick Bates
      • 20
        Evaluation of Event Reconstruction Techniques Towards an Electron-Neutrino Cross Section Measurement in The Upgraded T2K Near Detector

        The Tokai to Kamioka (T2K) experiment is a long-baseline neutrino oscillation experiment aiming to measure CP-violation in the lepton sector. So far, T2K has shown results that disfavor CP conservation with a confidence level of 90%. One of the major systematic uncertainties in the current oscillation analysis is the electron-neutrino cross-section. To reduce these uncertainties, the near detector complex ND280 has been upgraded recently with the installation of three new detectors: The Super Fine-Grained Detector(SuperFGD), two high-angle Time Projection Chambers, and time of flight detectors. These new detectors will allow a better understanding of neutrino interactions by lowering the energy threshold of and improving the angular acceptance of near detector selections.
        To reconstruct electron-neutrino events, we have developed dedicated electron identification methods optimized for the high-granularity of the SuperFGD: vertex finding, electromagnetic shower reconstruction, and photon background rejection. These methods have been validated using real neutrino beam, cosmic, and LED calibration data taken with the SuperFGD to begin evaluating and optimising the systematic uncertainties in a cross-section measurement. This poster reports on the techniques developed for extracting electron and photon samples used to evaluate the new SuperFGD reconstruction methods using both the existing TPC and new high-angle-TPCs for particle tagging.

        Speaker: Hokuto Kobayashi (University of Tokyo (JP))
      • 21
        Event reweighting with particle transformer networks

        Neutrino experiments rely on complex and computationally expensive detector simulations to predict observable quantities from neutrino interaction models. The significant cost of these simulations limits the feasibility to generate new detector-level events for changes in the interaction model. An approach often used is to produce a new simulation of only the interaction model, which is much less expensive, and reweight the existing detector simulation through some reweighting function. Often this function is restricted in the amount of information used to perform the reweighting, limiting the accuracy to either specific regions of phase space or to only a few variables or dimensions. We present a method based on Deep neural networks using Classification for Tuning and Reweighting (DCTR) using a transformer-based neural network architecture to perform reweighting utilizing the kinematic and flavor information of all particles. We demonstrate the method by reweighting different neutrino interaction generators and show it achieves high accuracy simultaneously across many different variables.

        Speaker: Andrew Cudd (University of Colorado Boulder)
        abc_poster_nufact2025.pdf
      • 22
        Field Cages for the new HA-TPCs of T2K Near Detector Upgrade

        T2K (Tokai to Kamioka) is a long-baseline neutrino experiment based in Japan, designed to measure neutrino oscillation parameters, including $ \theta_{13} $, $ \delta_{CP}$, $\theta_{23}$, and $\Delta m^2_{32}$. These parameters are determined by studying electron neutrino appearance probabilities and muon neutrino survival probabilities. In recent years, T2K has undergone significant upgrades to its beam-line and the magnetized Near Detector (ND280) to increase the neutrino flux and reduce systematic uncertainties. These improvements are critical not only for T2K but also for the next generation of neutrino oscillation experiments, as the beam-line and ND280 will play a key role in the long-baseline program of Hyper-Kamiokande, expected to be completed in 2027.
        A key component of the ND280 upgrade is the installation of two High-Angle Time Projection Chambers (HA-TPCs), designed to identify charged particles at large angles relative to the beam direction. Both HA-TPCs were successfully installed at J-PARC by May 2024.

        The HA-TPCs feature a gaseous active volume enclosed in a field cage constructed from lightweight composite materials, offering an optimal balance of mechanical and electrical properties while minimizing radiation length and dead volume. The readout is based on innovative Resistive Micromegas, which include a resistive layer for charge spreading to enhance spatial resolution and protect the electronics from sparks.

        Field cages serve multiple functions: (i) providing mechanical support to the detector, (ii) shaping the electric field, and (iii) containing the gas mixture while preventing contamination. The cage walls are made from composite materials with low atomic numbers and minimal material budget to reduce particle interactions and scattering. Additionally, they must exhibit high structural integrity to withstand over-pressure and gravitational forces. Precise design, prototyping, and rigorous validation were essential to meet the stringent geometrical tolerances and electrical insulation requirements.

        This contribution focuses on two main aspects of the Field Cages of HA-TPCs: (i) their design, production, and performance evaluation, (ii) and the study of their electric field properties.

        [1.] $\textbf{Field Cage Production and Validation:}$ The production process, quality assessment protocols, and the assembly and commissioning at CERN and J-PARC are presented. In addition, Field Cages design was improved thanks to detailed studies of electrical and mechanical performances with the development of mathematical modeling based on results obtained on small- and full-scale prototypes.

        [2.] $\textbf{Electric Field Characterization:}$ The uniformity of the electric drift field, which is critical for accurate track reconstruction was investigated. Deviations from ideal conditions can introduce systematic distortions in particle trajectories. Using finite element method (FEM) simulations and cosmic ray data, distortions in the electric field were evaluated and corrected using a 3D electric field map derived from the FEM simulation, significantly improving track reconstruction accuracy.

        Speaker: Matteo Feltre (Universita e INFN, Padova (IT))
        poster_nufact2025_v3.pdf
      • 23
        First Neutrino Candidates in the ProtoDUNE-HD data

        The Neutrino Platform at CERN hosts large-scale prototypes for DUNE’s Far Detector, aligned with the SPS beamline pointed towards the North Area.
        The 400 GeV/c SPS protons impacting on the T2 target area may produce exotic particles that could travel ~700 meters to the detectors, in addition to a substantial flux of neutrinos.
        Simulations of the neutrino flux predict that thousands of neutrino interactions are expected per week in the active volume of ProtoDUNE-HD spanning energies from a few GeV up to 180 GeV, constituting the main background for such search.

        The first step towards establishing a Beyond Standard Model physics program at the Neutrino Platform is therefore to observe neutrinos originating from the SPS beam. A sample of high-energy neutrino events in a DUNE FD-like LArTPC may also be of broader use to the DUNE collaboration. For example, by testing the performance of reconstruction algorithms on highly-energetic neutrino interactions with large hadronic showers.

        An initial neutrino search was performed by developing filters to remove cosmic events. After filtering, the remaining events were hand-scanned to identify neutrino candidates amongst the residual cosmic background.
        Out of the available ProtoDUNE-HD data, approximately 29 neutrino candidates were identified, and none were found in the beam-off control data.

        The visual scanning proved to be efficient as a first step, but now a full systematic analysis is under development that will use all available data, large Monte Carlo samples and full event reconstruction, with the aim of confirming whether ProtoDUNE-HD is capable of observing feebly interacting particles originating from the SPS beam.

        Speaker: Dario Pullia (CERN)
        NuFact2025.pdf
      • 24
        Hyper-Kamiokande Light Injection System

        Hyper-Kamiokande (Hyper-K) is a next-generation Water Cherenkov detector designed to study neutrino properties with exceptional accuracy. Precision measurements of neutrino oscillations, charge-parity (CP) violation, atmospheric and solar neutrino studies, as well as proton decay searches, are among the key physics goals of Hyper-K, making accurate detector calibration essential for achieving these scientific objectives.

        The Hyper-K light injection (LI) system plays a vital role in ensuring the detector is well-calibrated by injecting controlled pulses of light into the water volume, allowing for precise measurements of the detector’s photomultiplier tubes (PMTs) response, optical response, and water transparency. The inner detector (ID) part of the LI system will consist of 33 injector positions, each equipped with both a narrow-angle beam collimator and a wide-angle beam diffuser.

        In this poster, we present an overview of the LI system’s design and its role within the broader calibration framework of Hyper-K. We describe the key components of the system, the layout of injector positions, and the strategies for testing and validating its performance.

        Speaker: Unik Limbu
        NuFact2025_Poster_A0.pdf
      • 25
        Identification and reconstruction of atmospheric tau neutrinos in JUNO

        Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation 20-kton liquid scintillator (LS) detector currently under commissioning. JUNO is capable of exploring various physics topics including atmospheric neutrino oscillations. While the atmospheric neutrino flux is initially composed exclusively of muon and electron neutrinos, a large number of them are expected to oscillate to tau neutrinos according to the three-flavor neutrino oscillation hypothesis. However, the current neutrino oscillation studies predominantly focus on muon and electron neutrino measurements, and tau neutrino appearance measurements remain relatively limited due to its high energy threshold, dominated by Cherenkov detectors such as Super-K and IceCube. Searching for atmospheric tau neutrino appearance in JUNO can help verifying the three-flavor oscillation hypothesis and expand the application of LS detectors. This poster introduces the effort to identify and reconstruct atmospheric tau neutrinos in JUNO with a machine learning method. This method extracts features from PMT waveforms and uses them as inputs to machine learning models that are trained to identify tau neutrino interactions and reconstruct their direction and energy. Preliminary study with Monte Carlo simulation demonstrates the feasibility to conduct the tau neutrino appearance search in JUNO.

        Speaker: Xiaohan Tan (Shandong University)
      • 26
        Measurement of the muon neutrino CC1pi+ cross section on water with pion kinematics at the T2K near detector ND280

        The T2K experiment is a long-baseline neutrino oscillation experiment based in Japan, with the primary goal of measuring CP violation through comparing neutrino and antineutrino oscillations. The primary off-axis near detector, ND280, observes the neutrino beam before oscillation, and has the important role of constraining neutrino-nucleus interactions. This is a leading source of systematic uncertainty for current analyses, so constraining these is of even greater importance as the field moves to a high-precision era with Hyper-Kamiokande and DUNE. ND280 is composed of multiple sub-detectors; one of the two Fine-Grained Detectors (FGDs) features passive water layers, allowing for measurements of the cross section on water.

        This poster presents an analysis for measuring the muon neutrino charged current single positive pion cross section on water. The analysis features a novel method for reconstructing the momentum of low energy pions, allowing access to increased regions of phase space. Combined with extra data doubling the statistics of the previous measurement, this allows for a differential measurement in four dimensions, including the kinematics of the outgoing pion.

        Speaker: Dr Sam Jenkins (University of Liverpool)
        SJenkins_CC1pi_poster.pdf
      • 27
        Neutron scintillation in liquid Argon for reducing uncertainties in neutrino oscillation experiments

        For current and upcoming accelerator-based neutrino oscillation experiments, a precise understanding of neutrino-nucleus interactions is crucial to attaining the desired sensitivity. Insufficient knowledge of the energy carried by undetected particles, particularly neutrons, produced in neutrino-nucleus interactions can distort the reconstructed neutrino energy spectrum and introduces bias in the determination of oscillation parameters, and in searches for new physics. The characteristics of the scintillation produced by neutrons resulting from these interactions with the leading detector material in neutrino oscillation experiments remains poorly understood, especially in the tens-of-MeV energy range where experimental data are limited. We present a new local setup, SArIT, to measure scintillation in LAr induced by neutrons up to 40 MeV in kinetic energy. We aim to measure the scintillation light temporal pulse shape induced by neutrons and utilise pulse shape discrimination (PSD), with and without the presence of an electric field, to improve the light modelling in neutrino interactions, enhanced neutron detection, thereby improving the neutrino energy reconstruction methods.

        Speaker: Dr Ralte Lalnuntluanga (Tel Aviv University)
        Ralte_Lalnuntluaga_Nufact25_Poster_Final_1_Sept_2025.pdf
      • 28
        Reconstruction of neutral current interactions by atmospheric neutrinos in JUNO

        Jiangmen Underground Neutrino Observatory (JUNO) is a large-scale neutrino experiment located 700 meters underground in Southern China. JUNO is capable of detecting multiple types of neutrinos including atmospheric neutrinos which can undergo both charged current (CC) and neutral current (NC) interactions in the detector. In addition to the standard 3-flavor oscillation measured by CC interactions, the measurement of NC interactions induced by atmospheric neutrinos could potentially provide evidence for the existence of additional neutrino flavors that mix with the active 3 flavors. This measurement requires identification of NC events against CC events and other backgrounds. Besides, since the neutrino oscillation baseline length varies with the neutrino incident angle, directionality measurement for NC events could further increase the experiment's sensitivity. This poster introduces the recent progress of identifying and reconstructing atmospheric neutrino NC interactions in JUNO with Monte Carlo studies. In particular, a novel approach developed for the reconstruction of NC event's directionality utilizing the event vertex and neutron-capture positions is presented.

        Speaker: jiabin wang (Shandong University)
      • 29
        Search for $\mu^{+}\rightarrow e^{+}e^{+}e^{-}$ at the Mu3e experiment and the Commissioning of the Pixel Tracker.

        The Mu3e experiment is dedicated to observing charged lepton flavour violation through the neutrino-less decay of a muon to two positrons and an electron. The experiment is located around the Compact Muon Beam Line (CMBL) at the Paul Scherrer Institut, which produces muons at a rate of $10^{8}$ Hz. The experiment aims to observe the decay or exclude a branching ratio greater than $10^{-16}$. To achieve this, there must be $>10^{17}$ muons stopped in the detector. This detector must have a minimum reconstruction efficiency of $20\%$. The physical background for this decay is the Standard Model approved decay with neutrinos. Our suppressible background comes from combinatorics. These sources of background must be suppressed to below the 10E-16 level. The first focus of this research is the pixel tracking detector of the experiment and understanding the effect the efficiency has on the physics output of the experiment. Initially, a tracking algorithm was used to measure and analyse the track reconstruction efficiency of the tracking detector. From this, an alternative tracking algorithm was designed to identify inefficiencies in the detector and reconstruct tracks that would otherwise be missed. Mu3e is a high-intensity experiment and thus, a high reconstruction efficiency is critical. By optimising both algorithms under realistic detector conditions, dead or noisy pixel sensors can be identified, and track reconstruction efficiency can be recovered. The results of these algorithms are presented. In addition to work on the efficiency of the pixel detector, a status of the University of Liverpool’s contribution to the pixel sensor quality control is provided.

        Speaker: Charles Kinsman
      • 30
        Simulation of the BUTTON Detector

        Next-generation neutrino detectors will require new simulation and reconstruction software. For water and scintillator-based neutrino detectors, RATPAC is a leading simulation framework. The latest release,
        RATPAC-TWO, brings several enhancements over the original version, improving both the usability and collaboration potential between experiments. With the 30-tonne BUTTON experiment at Boulby
        Underground Laboratory about to begin operations, direct comparisons between data and simulation are almost feasible. This poster will highlight the integration of novel technologies, including Water-based
        Liquid Scintillators (WbLS), within the RATPAC framework. These innovations hold significant promise for improving the precision of neutrino measurements in the few MeV range, particularly for sources such as
        reactors and core-collapse supernovae. Starting with BUTTON, the WbLS program at Boulby lays the foundation for a potential ktonne WbLS neutrino detector and future dark matter experiments.

        Speaker: Adam Tarrant (University of Liverpool)
      • 31
        The Italian Summer Students Program at Fermilab and other US Laboratories

        Since 1983 the Italian groups collaborating with Fermilab (US) have been running a 2-month summer training program for Master students. While in the first year the program involved only 4 physics students, in the following years it was extended to engineering students. Many students have extended their collaboration with Fermilab with their Master Thesis and PhD.
        The program has involved almost 600 Italian students from more than 20 Italian universities. Each intern is supervised by a Fermilab Mentor responsible for the training program. Training programs spanned from Tevatron, CMS, Muon (g-2), Mu2e and SBN and DUNE design and data analysis, development of particle detectors, design of electronic and accelerator components, development of infrastructures and software for tera-data handling, quantum computing and research on superconductive elements and accelerating cavities.
        In 2015 the University of Pisa included the program within its own educational programs. Summer Students are enrolled at the University of Pisa for the duration of the internship and at the end of the internship they write summary reports on their achievements. After positive evaluation by a University of Pisa Examining Board, interns are acknowledged 6 ECTS credits for their Diploma Supplement. In the years 2020 and 2021 the program was canceled due to the sanitary emergency but in 2022 it was restarted and allowed a cohort of 21 students in 2022, and a cohort of 27 students in 2023, and of 13 students in 2024 to be trained for nine weeks at Fermilab. We are now organizing the 2025 program.

        Speaker: Prof. Simone Donati (Istituto Nazionale di Fisica Nucleare - Pisa)
        SummerStudents_NuFact2025.pdf
      • 32
        The LED pulser system for the Hyper-Kamiokande outer detector light injection system

        The upcoming Hyper-Kamiokande experiment is a next generation water Cherenkov detector based in Japan. Using an upgraded JPARC neutrino beam, Hyper-K aims to make precision measurements of the CP violating phase $\delta_{CP}$, along with neutrinos from astrophysical sources, and proton decay. With a fiducial volume approximately eight times larger than its predecessor Super-Kamiokande, Hyper-K is expected to be systematically limited. Therefore, in order to make precision measurements, an accurate calibration system is required to constrain systematic uncertainties. One of these is the Light Injection (LI) system.

        The Hyper-K outer detector (OD) will be instrumented with approximately 3600 3” PMTs, surrounded by wavelength-shifting plates; this is primarily used as a veto region. The OD part of the LI system will consist of 12 narrow-angle collimators and 122 wide-angle diffusers, with the latter illuminated by custom designed and manufactured pulsed LED sources, capable of optical pulses of $\mathcal{O}$(1 ns). These will be used for charge non-linearity measurements and timing offset calibration. This poster describes the OD calibration system and LED pulser boards, focussing on the PCB design for high-frequency circuits, the sub-circuit design to make each LED board functional and the results achieved using these boards.

        Speakers: Mr Balint Bogdan (University of Liverpool), Dr Sam Jenkins (University of Liverpool)
      • 33
        The ratio of $\gamma / \pi^0$ production rates in neutrino-nucleus interactions at the $\Delta$ resonance mass region.

        We study the dependence of neutrino-induced $\gamma/\pi^0$ production ($\stackrel{ {(-)}}{\nu_\mu} + A \to \stackrel{ {(-)}}{\nu_\mu}(\mu) +\gamma/\pi^0 + X$) on the target nucleus A, at the $\Delta$ resonance mass region.
        We predict the ratio of the $\gamma / \pi^0$ production rates in NC and CC interactions and for $\nu_\mu$ and $\bar \nu_\mu$ beams:
        - Argon target: $\sim$3.1\% (NC/CC $\nu_\mu/\bar \nu_\mu$)
        - Water target: $\sim$1.9\% (NC), $\sim$2.3\% (CC $\nu_\mu$), $\sim$1.7\% (CC $\bar \nu_\mu$)
        - Liquid Scintillator target: $\sim$1.7\% (NC), $\sim$2.1\% (CC $\nu_\mu$), $\sim$1.6\% (CC $\bar\nu_\mu$)

        We also discuss solving the MiniBooNE anomaly by looking at the CC single photon and single neutral pion production rates at the SBN program experiments at Fermilab.

        Speaker: Dr Ara Ioannisyan (Institute for Theoretical Physics and Modeling)
        AraIoannisyanNuFACT2025.pdf
      • 34
        Time-of-Flight Detector in the T2K ND280: From Commissioning to First Physics Insights

        Precise measurements of neutrino oscillations in long-baseline experiments depend on an accurate understanding of neutrino beam properties and neutrino–nucleus interactions—two dominant sources of systematic uncertainty. To reduce these uncertainties, the ND280 near detector of the T2K neutrino experiment in Japan has undergone a major upgrade designed to provide full polar angle acceptance, lower proton tracking thresholds, and enhanced timing precision.

        A key component of this upgrade is the Time-of-Flight (TOF) detector, which consists of six scintillator planes surrounding the inner upgrade components. Installed at J-PARC between 2023 and 2024, the TOF has been operational and collecting data since installation. This poster presents the TOF commissioning results, performance characterisation, and first physics results using beam and cosmic-ray data.

        The TOF achieves a timing resolution of ~180 ps, enabling robust particle identification and effective rejection of out-of-fiducial-volume events. Ongoing calibration efforts and detector performance studies aim to further improve timing resolution and detection efficiency. The results demonstrate the TOF’s capabilities and underscore its role in achieving the physics goals of the upgraded T2K ND280 detector.

        Speaker: Anezka Klustova
        klustova_tofPosterNuFact25_v5.pdf
    • Reception The Spine, Liverpool

      The Spine, Liverpool
  • Tuesday 2 September
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Joe Price
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • WG1 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: yun tse tsai (SLAC)
      • 38
        Investigating Earth's Mass and the Correlated Densities of Its Internal Layers Using Atmospheric Neutrino Oscillations at IceCube DeepCore

        The information regarding the mass of Earth and its internal structure has primarily been obtained through gravitational measurements and seismic studies, both of which rely on gravitational and electromagnetic interactions, respectively. However, neutrinos offer an independent method for exploring the Earth's interior by utilizing weak interactions, particularly through the effects of Earth’s matter on neutrino oscillations. Since these effects are influenced by the electron number density, neutrino oscillations at the GeV scale can be employed to measure the quantity and distribution of electrons within the Earth. This electron number density can then be translated into the matter density of the Earth. In our study, we focus on atmospheric neutrino oscillations at DeepCore, a densely instrumented sub-detector located at the center of the IceCube Neutrino Observatory. This allows us to investigate the matter effects that neutrinos experience while passing through the Earth, providing valuable insights into the planet's internal properties. This talk will primarily highlight the results from IceCube DeepCore in measuring Earth's mass and determining the correlated densities of its various layers, showcasing neutrino oscillations as a unique tool for exploring the Earth's internal structure.

        Speaker: Sharmistha Chattopadhyay (Institute of Physics, Bhubaneswar, Odisha, India, and Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India)
        NuFact_2025_Sharmistha_Chattopadhyay.pdf
      • 39
        Exploiting KM3NeT/ORCA data to study atmospheric tau neutrinos

        The next generation of neutrino experiments aims to provide high-precision measurements of the neutrino oscillation parameters in order to reveal the major unknowns in neutrino physics. Among them, validating the three-neutrino flavor paradigm while testing the non-unitarity of the neutrino mixing matrix remains one of the most exciting, as it allows the
        exploration of new physics scenarios.

        KM3NeT/ORCA is a water Cherenkov neutrino detector being built in the Mediterranean Sea. Its primary physics goal is to achieve an early determination of the neutrino mass ordering from the oscillation of atmospheric neutrinos traversing the Earth. In particular, its
        large fiducial mass and the density of detection elements will enable unprecedented statistics for studying tau neutrinos. This talk presents the first results based on data from a partially instrumented detector volume, representing 5% of the final setup and an exposure of 433 kton-years. By studying the oscillation of atmospheric electron and muon neutrinos into tau neutrinos, the measurement of the normalisation factor, defined as the observed-to-expected tau neutrino ratio, as a constraint on the charged-current cross-section, is reported. Beyond the standard three-neutrinos flavor paradigm, a first test of the non-unitarity mixing matrix in the atmospheric sector is also presented. Event reconstruction and selection procedures, the analysis strategy, and future prospects are discussed in detail.

        Speaker: Dr Chiara F Lastoria (LPC Caen, CNRS/IN2P3, Caen (France))
        Talk_NuFact_2025_ORCA_CLastoria.pdf
      • 40
        Atmospheric neutrino oscillations in JUNO

        The Jiangmen Underground Neutrino Observatory (JUNO) experiment is a multi-purpose experiment located in southern China. The detector is designed with 20-kton liquid scintillator and currently in its filling stage. The main physics goal of JUNO is to determine the neutrino mass ordering (NMO) via a precise measurement of the reactor neutrino oscillation spectrum. Atmospheric neutrino oscillation measurement in JUNO can potentially provide independent sensitivity to NMO and increase JUNO’s total sensitivity in a joint analysis. This talk reports the recent progress made by JUNO towards this goal. The performances of atmospheric neutrinos' energy and direction reconstruction, event identification and background rejection with Monte Carlo simulation are discussed.

        Speaker: Qiyu Yan
        junoatm_nufact_2025_v4.2.pdf
      • 41
        Reconstruction Performance of Atmospheric Neutrinos in the DUNE Experiment

        The Deep Underground Neutrino Experiment (DUNE) is a pioneering long baseline neutrino experiment situated in the US that will feature multi-kiloton scale Liquid Argon Time Projection Chambers (LArTPCs). Beyond its primary beam neutrino objectives, DUNE's cutting-edge technology offers a unique opportunity to investigate atmospheric neutrinos with unprecedented precision. Atmospheric neutrinos, with their wide-ranging energy spectrum and extensive path lengths, provide a rich dataset for probing various energy-to-distance (L/E) values and therefore can provide invaluable insights into the different parameters of the PMNS matrix. Moreover, the results obtained with this source of neutrinos will be totally complementary to the beam neutrino program of DUNE and will allow to break degeneracies and have a more complete view of neutrino oscillations.

        This talk will focus on the reconstruction performance of atmospheric neutrinos within the DUNE experiment. We will present the first results obtained with the full DUNE simulation and reconstruction chain for atmospheric neutrinos, including detailed analyses of the hadronic system, energy, and direction reconstruction capabilities. We aim to demonstrate the potential of DUNE's LArTPC technology in achieving high-precision measurements. This foundational work sets the stage for future sensitivity studies to neutrino oscillation and new physics using atmospheric neutrinos in DUNE.

        Speaker: Pierre Granger (CERN)
        nufact_atm_DUNE.pdf
    • WG2 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Elena Gramellini (University of Manchester)
      • 42
        Neutrino Interaction Measurements with the SBND Experiment

        The Short-Baseline Near Detector (SBND) is a 112-ton scale Liquid Argon Time Projection Chamber (LArTPC) neutrino detector positioned in the Booster Neutrino Beam at Fermilab, as part of the Short-Baseline Neutrino (SBN) program. The detector is currently collecting neutrino beam data. Located only 110 m from the neutrino production target, SBND is exposed to a very high flux of neutrinos and will collect millions of neutrino interactions each year. This huge number of neutrino interactions, with the precise tracking and calorimetric capabilities of LArTPC, enables a wealth of cross section measurements to be made with unprecedented precision. In addition, SBND has the unique characteristic of being remarkably close to the neutrino source and not perfectly aligned with the neutrino beamline, in such a way that allows sampling of multiple neutrino fluxes using the same detector, a feature known as SBND-PRISM. SBND-PRISM can be utilized to study distinctive neutrino-nucleus interactions channels. This talk will motivate the SBND cross-section physics program, present ongoing measurement efforts, and discuss prospects for the rich program ahead.

        Speaker: Luis Pelegrina Gutiérrez (Universidad de Granada)
        NuFact2025_NeutrinoInteractionsInSBND.pdf
      • 43
        Recent cross-section results from MicroBooNE

        MicroBooNE is a Liquid Argon Time Projection Chamber, able to image neutrino interactions with excellent spatial and timing resolution, enabling the identification of complex final states resulting from neutrino-nucleus interactions. As a result, MicroBooNE has produced a variety of neutrino cross-section measurements on argon, spanning almost four orders of magnitude and across all major interaction modes - pionless, neutral and charged pion production, neutral current interactions as well as rare final states including strange mesons and baryons such as Λ, η and K. This talk will present MicroBooNE’s recent measurements, including the latest $\nu_{\mu}$CC results without any pions in the final state, measurements of NC and CC pi0 production on argon as well as our first results of kaon production in argon. This talk will showcase our unique sensitivity to probing neutrino interaction models at both the nucleon and nuclear levels.

        Speaker: Adi Ashkenazi
        250902_NuFACT_uB_CS .pdf
      • 44
        Neutron Physics in the DUNE-ND 2x2 Demonstrator

        The Deep Underground Neutrino Experiment (DUNE) is a cutting-edge long-baseline experiment under construction in the United States. DUNE will use a far detector (FD) and a near detector (ND) to sample a high-intensity neutrino beam produced at Fermilab. This experiment aims to conduct precise studies of neutrino oscillations, establish the ordering of neutrino masses, and investigate potential CP symmetry violation in the lepton sector. To achieve its goals, DUNE will require precise reconstruction of the neutrino energy. In this context, neutrons produced in neutrino-argon interactions become a major challenge since neutron-induced activity is difficult to identify for reconstruction algorithms. In this talk, I will introduce the efforts to perform neutron identification using neutron-induced protons in the 2x2 Demonstrator. The 2x2 is a prototype of the liquid argon detector of the DUNE ND which features a modular design and novel charge and light detectors. This analysis leverages the modular design of the 2x2 using a deep learning-based reconstruction to identify neutron activity. Furthermore, I will present the prospects of identifying neutrons via low-energy photon activity and neutron capture on argon and using them as a calibration source for the 2x2.

        Speaker: Luis Mora-Lepin (Florida State University)
        2x2_neutrons_NuFact2025_V3.pdf
      • 45
        Recent Neutrino-Nucleus Cross Section results from the ICARUS Experiment

        The ICARUS experiment, utilising Liquid Argon Time Projection Chamber (LAr TPC) technology, has been installed at Fermilab in Chicago, Illinois, following its initial operation in Italy and subsequent refurbishment at CERN. ICARUS has successfully been taking physics data at Fermilab since June 2022. While the experiment's primary objective is to function as the far detector of the Short Baseline Neutrino program (SBN), searching for hints of physics beyond three-flavour PMNS neutrino oscillations, ICARUS also offers other diverse physics capabilities, including searches beyond the standard model and measurements of cross-sections. In addition to being exposed to the common Booster Neutrino (BNB) beamline of the SBN experiment, ICARUS receives neutrinos from the Main Injector (NuMI) beam. Due to the off-axis angle between NuMI and ICARUS, coupled with contributions from both pion and kaon decays to neutrino fluxes, interactions of NuMI neutrinos within ICARUS can be detected over a range of several GeV in energy. Measurements of these interactions present unique opportunities to infer neutrino interaction cross sections on an argon nuclear target within an energy range that overlaps both the SBN oscillation search and a significant portion of the DUNE spectrum. This presentation will summarise the current status of ICARUS' muon-neutrino cross-section measurements. The results of ICARUS' first cross-section measurement will be shown, reporting variables that characterise correlations between the leptonic and hadronic system for events with no pions produced in the final state.

        Speaker: Dr Stephen Dolan (CERN)
        NuMIatICARUSNuFact25.pdf
    • WG4 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Ljiljana Morvaj (Paul Scherrer Institute (CH))
      • 46
        Status of the Mu3e experiment at PSI

        The Mu3e experiment at the Paul Scherrer Institute (PSI) will search for the charged lepton flavour violating decay µ⁺ → e⁺e⁻e⁺, improving the current best limit set by the SINDRUM experiment by four orders of magnitude.

        Mu3e will be conducted in two phases. Phase I, currently under construction at the πE5 beamline at PSI, will utilise an intense DC surface muon beam of 10⁸ µ⁺/s to reach a single event sensitivity of 2 × 10⁻¹⁵. Phase II will exploit the future High-Intensity Muon Beam to push the sensitivity further to the 10⁻¹⁶ level.

        Such an improvement in sensitivity is enabled by several key aspects of the experiment design: the availability of high-intensity muon beams, a low-material-budget tracking system consisting of the ultra-thin HV-MAPS silicon pixel detectors combined with scintillating fibre and tile detectors providing sub-ns timing resolution to reduce multiple scattering, and a high-rate data acquisition system capable of handling the large data volume produced by the detector at high beam rates. The detector system, specifically optimised for the µ⁺ → e⁺e⁻e⁺ signature, operates under a 1 T solenoidal magnetic field, enabling precise reconstruction of the decay vertex and invariant mass of the three final-state particles.

        Preparations for Phase I data-taking are actively ongoing at the PSI πE5 beamline. A recent beamtime campaign in June 2025 validated key detector components - including vertex, scintillating fibre, and tile modules - and their integration with the high-intensity muon beamline under a 1 T magnetic field, marking a significant milestone in commissioning.

        This contribution will present the status of the experiment, the first results from the recent beamtime campaign at PSI, and future prospects.

        Speaker: Mikio Sakurai (UCL)
        Mu3e_MikioSakurai_NuFact2025.pdf
      • 47
        Conceptual Design of the Muonium-to-Antimuonium Conversion Experiment (MACE)

        The spontaneous conversion of muonium to antimuonium is one of the interesting charged lepton flavor violation phenomena, offering a sensitive probe of potential new physics and serving as a tool to constrain the parameter space beyond the Standard Model. The Muonium-to-Antimuonium Conversion Experiment (MACE) is designed to utilize a high-intensity muon beam, a Michel electron magnetic spectrometer, a positron transport system, and a positron detection system, to either discover or constrain this rare process with a conversion probability of $\mathcal{O}(10^{-13})$. In this talk, we will present the experimental design and recent progress on prototyping and validation of MACE.

        Speaker: Siyuan Chen
        MACE_Siyuan_NuFact2025.pdf
      • 48
        Probing and Knocking with Muons

        We propose here a set of new methods involving probing and knocking with muons (PKMu). There is a wealth of rich physics to explore with GeV muon beams. Examples include but not limited to: muon scattering can occur at large angles, providing evidence of potential muon-philic dark matter or dark mediator candidates; muon-electron scattering can be used to detect new types of bosons associated with charged lepton flavor violation; precise measurements of GeV-scale muon-electron scattering can be employed to probe quantum correlations.
        https://arxiv.org/abs/2503.22956 accepted by Modern Physics Letters A

        Speaker: Qiang Li (Peking University (CN))
        PKMU_25_Nufact.pdf
    • WG6 Space 8 (The Spine, Liverpool)

      Space 8

      The Spine, Liverpool
      Convener: Tanaz Mohayai (Indiana University)
      • 49
        Direct neutrino mass with the PTOLEMY demonstrator

        PTOLEMY aims to measure the lowest neutrino mass by resolving the β-decay endpoint of tritium. A demonstrator, currently under construction at LNGS, will rely on amassing a solid-state source of atomic tritium; a cyclotron radiation-based background suppression system; a novel, compact EM filter; and an O(50meV)-precision spectrometer. PTOLEMY faces many novel technical challenges, and an evolving demonstrator setup will be crucial for testing new technologies for the longer-term goals of the first direct observation of the CνB.

        Speaker: James Mead (University of Amsterdam / Nikhef)
        jvmead_nufact_ptolemy.pdf
        jvmead_nufact_ptolemy.pptx
      • 50
        Toward Additive Manufacturing of 3D-Segmented Scintillator Particle Detector

        Plastic scintillator detectors with 3D granularity and sub-nanosecond time resolution offer simultaneous particle tracking, identification, and calorimetry. However, achieving fine segmentation at scale remains a major challenge due to high manufacturing costs, extended production timelines, and stringent precision requirements. To overcome these barriers, the 3DET R&D collaboration has developed a novel additive manufacturing technique that enables the monolithic fabrication of finely segmented 3D scintillators, thereby eliminating the need for complex assembly and additional processing.

        A prototype was fabricated using Fused Deposition Modeling (FDM), consisting of a 5 × 5 × 5 matrix of optically isolated scintillating voxels. The design integrates transparent polystyrene, 3D-printed reflective structures, and orthogonal 1 mm holes to accommodate wavelength-shifting fibers. The detector’s performance was evaluated in a test beam at CERN’s Proton Synchrotron, demonstrating high light yield, minimal optical crosstalk, and efficient particle detection.

        To enhance light confinement, a new white reflective filament was developed, showing improved reflectivity and transmittance

        We will present recent advancements and experimental results from prototype characterization. This work establishes a scalable, cost-effective, and time-efficient approach for producing next-generation scintillator detectors with arbitrary geometries, enabling compact, modular, and high-performance particle detection systems.

        Speaker: Dr Umut Kose (ETH-Zurich)
        UKose_3DET_NuFact2025.pdf
      • 51
        DUNE's ND-LAr and its prototyping program (2x2 and FSD)

        The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino oscillation experiment with the primary goal of measuring the mass hierarchy and CP-violating phase. Neutrinos will be measured at two detector facilities, namely a Near Detector (ND) located at Fermilab close to where the neutrino beam is produced by the Long-Baseline Neutrino Facility (LBNF) and a Far Detector located 1300 km away at the Sanford Underground Research Facility (SURF). The ND will play a crucial role in measuring the unoscillated neutrino flux, which is needed to precisely measure the neutrino oscillation probabilities and constrain systematic uncertainties. Here, we focus on the liquid argon (LAr) component of the ND, which will be an array of 7x5 LAr time projection chambers (LArTPCs) that will detect particles from their ionisation charge deposits and scintillation light signals using novel 3D pixel and high-coverage light readout systems, respectively. We present preliminary results for the 2x2 prototype of ND-LAr, comprising of four LArTPC modules at reduced length scale, which was used in a data taking campaign on the NuMI beamline at Fermilab during July 2024, as well as cosmic ray data from a single module Full Scale Demonstrator (FSD). We also give a general overview of the simulation and reconstruction software used for ND-LAr, 2x2 and FSD.

        Speaker: Richard Diurba (University of Bern)
        DUNEND2x2NuFACT.pdf
        DUNEND2x2NuFACT.pdf
        DUNEND2x2NuFACT.pptx
    • Lunch Break The Spine, Liverpool

      The Spine, Liverpool
    • WG1+WG2 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Conveners: Elena Gramellini (University of Manchester), yun tse tsai (SLAC)
      • 52
        Neutrino-Nucleus Cross Section Impacts on Neutrino Oscillation Measurements
        Speaker: Shirley Li (UC Irvine)
        Li_crosssection_impact.pdf
      • 53
        Electrons for neutrino oscillation experiments

        The e4nu collaboration investigates lepton-nucleus interactions to deepen our understanding of neutrino behavior in nuclear environments. By leveraging the similarities between electron-nucleus and neutrino-nucleus interactions, e4nu utilizes a broad phase space of exclusive electron scattering data. This data, collected on nuclear targets similar to those used in neutrino oscillation experiments and within comparable energy ranges, is instrumental in improving the physics models used in event generators and refining methods for reconstructing the incoming neutrino energy.
        After demonstrating a clear bias in the reconstructed lepton energy for the simple case study of quasi-elastic-like interaction, events with one lepton and one proton in the final state, this talk will present e4nu’s latest results involving more complex final states with additional hadrons. These studies are particularly relevant for future DUNE measurements, which will involve a higher-energy neutrino beam.

        Speaker: Adi Ashkenazi (Tel Aviv University (IL))
        250902_NuFACT_e4nu.pdf
      • 54
        Modelling neutrino interactions for T2K analyses

        To achieve the ambitious goal of characterising neutrino flavour oscillations with percent-level precision, current and future long-baseline neutrino oscillation experiments must significantly reduce existing systematic uncertainties. Among the most challenging are those associated with modelling neutrino–nucleus interactions in the few-GeV energy range.

        To address this, the T2K collaboration is undertaking a comprehensive effort to incorporate state-of-the-art theoretical models into its Monte Carlo event generator, NEUT, and to develop a robust parametrisation of model uncertainties for use in oscillation analyses. This talk will present the new uncertainty model developed for T2K's latest oscillation measurement. Key improvements include: newly introduced low-energy transfer parameters describing the strength of Continuum Random Phase Approximation (CRPA) and Final State Interactions (FSI); a more sophisticated parametrisation of the nucleon cascade; and an improved treatment of Pauli blocking, now extended to single pion production. In addition, a more robust approach to modelling νₑ/ν_μ differences has been implemented via collinear/soft photon correction, among other enhancements. Lastly, we will discuss ongoing work towards the ND280 upgrade analysis, including the introduction of a brand-new quasielastic model known as the Energy Dependant Relativistic Mean Field (ED-RMF) model.

        Speaker: Dr Stephen Dolan (CERN)
        T2KUncertaintyModel.pdf
      • 55
        MicroBooNE’s cross-section program for future long-baseline oscillations

        Making high-precision measurements of neutrino oscillation parameters requires an unprecedented understanding of neutrino-nucleus scattering. This is especially urgent for upcoming experiments like DUNE and Hyper-K. To help fulfill this need, MicroBooNE has produced an extensive set of neutrino cross-section results that probe both the leptonic and hadronic components of the interaction. This talk will present our recent results in channels that are critical for a variety of oscillation measurements on argon, including DUNE. They include our first measurements of $\nu_{e}$CC interactions on argon with a single charged pion in the final state, which are dominant interaction modes in the energy range for DUNE. These, combined with additional MicroBooNE $\nu_{e}$CC measurements can also help shed more light on the $\nu_{e}$/$\nu_{\mu}$ cross-section ratio which is an important systematic uncertainty for $\nu_{e}$ appearance searches. In addition, we present new results in the quasielastic-like 1mu1p channel which can more directly inform sub-GeV atmospheric neutrino oscillation measurements at DUNE. These results are able to probe the extent to which the interaction model influences the reconstruction of the neutrino direction, given our fixed beam orientation, thus highlighting its sensitivity to various nuclear effects and modeling of final state interactions.

        Speaker: Afroditi Papadopoulou
        Papadopoulou_MicroBooNE_NuFACT2025_Liverpool_Sept_1_2025.pdf
    • WG3 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Megan Friend (KEK High Energy Accelerator Research Organization (JP))
      • 56
        The neutrinos from STORed Muons (nuSTORM) facility Space 4 & 5

        Space 4 & 5

        The Spine, Liverpool

        The neutrinos from STORed Muons (nuSTORM) facility enables precise neutrino physics studies through the use of innovative neutrino beams created by muon decay, which is characterised by well-defined flavour composition and energy spectra of the neutrino beam. Combined with precise muon flux measurements, with a final target of $\%$-level precision in neutrino flux determination, this will facilitate a diverse research program probing fundamental neutrino properties.

        The facility uses a race-track-like storage ring to store muons with momenta tunable between 1 and 6 GeV/c, enabling precise measurements of $\nu-A$ scattering for both, $\nu_{\mu}$ and $\nu_{e}$ over energy ranges relevant for long-baseline experiments. It also allows for highly sensitive searches for exotic processes and studies of short-baseline flavour transitions exceeding the reach of already planned experiments. As a technology test-bed for high-brightness muon beams, nuSTORM is on the path towards a multi-TeV muon collider and could be part of a test-facility serving a muon-cooling demonstrator.

        This talk will present the current status of nuSTORM and its physics capabilities. It will also include results from a FLUKA-based Bayesian optimization study aimed at enhancing the neutrino flux by improving pion capture through optimized target and horn geometries at different pion momentum settings.

        Speakers: Marvin Pfaff (Imperial College (GB)), Paul-Bogdan Jurj, Rohan Kamath (Imperial College London)
        nuSTORM_NuFACT25_talk.pdf
      • 57
        Pion Capture and Transport for ESSnuSB+ Space 4 & 5

        Space 4 & 5

        The Spine, Liverpool

        The European Spallation Source Neutrino Super Beam + ( ESSnuSB+) project aims to make precision measurements of neutrino-nucleus interaction cross sections. To do this it will utilize the impact of a 1.25 MW proton pulse from the ESS (European Spallation Source) Linac on a target with the ultimate aim of creating a muon and electron neutrino beam from a muon decay ring (based on a low-energy version of the neutrinos from stored muons proposal, LEnuSTORM). In order to achieve this, it is necessary to transport pions downstream of the target system from the megawatt-class target station environment through the radiation shielding to a point where they can be injected into the decay ring.

        This requires the design of a capture and focus system for the pions, as well as a transfer line with a large acceptance both in terms of the momentum spread and in the transverse directions. The design of this transfer line is constrained by the short decay length of the low-energy pions, and must meet the layout considerations whilst maintaining an appropriate momentum acceptance and a minimum overall length. This presentation discusses considerations for the capture, transport, and injection of low energy pion beams and how these may be implemented at the future ESSnuSB+ experiment.

        Speaker: Dr Max Topp-Mugglestone (CERN)
        20250902-nufact-essnusb-pion.pdf
      • 58
        A Low Energy Muon Storage Ring for Neutrino Cross-Section Measurements Space 4 & 5

        Space 4 & 5

        The Spine, Liverpool

        The ESS Neutrino SuperBeam project (ESSnuSB) is a proposed neutrino long-baseline experiment at ESS, Lund, Swedem, which aims at measuring the leptonic CP-violating phase, $\delta_{CP}$. By using the high-intensity ESS linear accelerator to produce the world's brightest pulsed neutrino source, the measurement will reach a uniquely high precision. In order to further enhance the precision, the Low Energy nuSTORM (Neutrinos from STored Muons) facility is under design, focusing on the detailed measurement of neutrino-nucleus cross-section within the neutrino energy range relevant to ESSnuSB.

        The nuSTORM concept, introduced in 1980, uses neutrinos from muons stored in a racetrack-shaped ring. The precisely controlled stored muon intensities, in the nuSTORM ring makes it possible to measure absolute cross-section with high precistion, explore the potential existence of sterile neutrinos and test technologies critical to the progress towards a Muon Collider or Neutrino Factory.

        LEnuSTORM utilizes much of the infrastructure of ESSnuSB long-baseline experiment. It will receive compressed proton beam pulses from the ESSnuSB accumulator, requiring only one of the four sub-pulses per main pulse, and a single target with a horn. The compressed proton pulse will generate a short pulse of charged pions emerging from the horn. These pions will be transferred to and injected into the muon storage ring, where they will decay and produce the muon beam.

        Previous nuSTORM designs are designed for higher beam energies in the GeV range whereas the LEnuSTORM, which relies on the ESS, aims at performing cross-section measurements in the low-energy region 0.2-0.6 GeV where cross-section data is currently missing.

        Speaker: Maja Olvegaard (Uppsala University (SE))
        Olvegaard_LEnuSTORM_NuFact25_2025-09-02.pdf
        Olvegaard_LEnuSTORM_NuFact25_2025-09-02.pptx
    • WG4 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Prof. Kim Siang Khaw (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
      • 59
        J-PARC muon g-2/EDM experiment

        The J-PARC muon g-2/EDM experiment aims to precisely measure the anomalous magnetic moment and electric dipole moment based on a novel low-emittance muon beam. Such a beam is realized by a muon linear accelerator following a cooled muon source, which allows to employ different techniques than the BNL and FNAL experiments such as a compact storage ring without electric focusing and track detection of decay positrons.
        The experiment is currently the only one capable of measuring the dipole moments in a competitive precision and being prepared to start data taking in 2030. In this talk, we present the recent progresses, current status, and future prospects of the experiment.

        Speaker: Masato Kimura (IPNS, KEK)
        NuFACT2025_Overall.pdf
      • 60
        Precision Measurement of the Muon Anomalous Precession Frequency Using Run‑4/5/6 Data of the Muon g-2 Experiment at Fermilab

        The Muon g-2 Experiment at Fermilab has achieved a significant milestone by measuring the muon anomalous magnetic moment with a precision of 127 parts per billion (ppb), surpassing its original design goal of 140 ppb. This presentation provides an overview of the analysis of the anomalous precession frequency using the Run-4/5/6 dataset, which is crucial for the Muon g-2 measurement. We will discuss the analysis workflow and the determination of systematic uncertainties that contributed to this achievement. Special attention will be given to the modeling of coherent betatron oscillations (CBO) in the presence of the newly introduced radiofrequency (RF) field, as well as the identification and correction of residual slow effects observed in the time spectrum. These advancements are of vital importance for enhancing the accuracy of anomalous frequency measurement.

        Speaker: Zejia Lu
        NuFact2025_Zejia_Lu.pdf
        NuFact2025_Zejia_Lu.pptx
      • 61
        Status of the MUonE experiment

        The MUonE experiment at CERN aims to determine the leading-order hadronic contribution to the muon by an innovative approach, using elastic scattering of 160 GeV muons on atomic electrons in a low-Z target. The M2 beam line at CERN provides the necessary intensity needed to reach the statistical goal in few years of data taking. The experimental challenge relies in the precise control of the systematic effects. A first run with a minimal prototype setup was carried out in 2023. A pilot run is in preparation to be held in 2025 with a reduced setup of the full detector components. We will present the status of the experiment, first preliminary results and the future plans.

        Speaker: Dr Saskia Charity (University of Liverpool (GB))
        MUonE-NuFACT-scharity.pdf
      • 62
        Searching for a muon EDM at the Fermilab Muon g-2 experiment

        The new Muon g-2 experiment at Fermilab, while primarily designed to measure the muon's anomalous magnetic moment, also offers the unique opportunity to perform a world-leading search for the muon's electric dipole moment (EDM). Within the Standard Model, the muon EDM is predicted to be vanishingly small, orders of magnitude smaller than the reach of current experiments. However, some BSM models predict different mass scaling, or decouple the EDM from the lepton masses altogether, allowing for much larger EDMs. As such, any observed signal would provide direct evidence of new physics and a new source of CP violation in the lepton sector. Even in the absence of a discovery, improving the experimental limits on the muon EDM provides valuable constraints on BSM theories. This talk will present the experimental strategies employed at Fermilab to search for a muon EDM, with a focus on using data from the straw trackers, and will give an update on the current status and future prospects of the analysis.

        Speaker: Dominika Vasilkova
        DV_nufact2025.pdf
      • 63
        Development of technology for storage ring EDMs

        We outline the physics case for the study of hadron edms that follow on from the successful FNAL g-2 muon experiment. The long term goal is making measurements of edms at, or below, the standard model expectation to provide quantifiable insight into the outstanding strong CP problem. The frozen spin technique spin technique is introduced and a possible lattice for the construction of such a ring presented. The method relies on the simultaneous measurement of the polarization of beams of counter rotating protons (or deuterons). New detector technologies for polarimeters are discussed. A prototype of a 4m section of such a ring is being developed and we present progress on the construction of precision electrostatic high field deflectors and matched micron (arc-second) pair roll, yaw mechanisms. The key systematics required to be overcome are presented as the techniques that have been developed to control and evaluate these systematics.

        Speaker: Themis Bowcock
        NUFACT2025.pdf
    • WG5 Space 9 (The Spine, Liverpool)

      Space 9

      The Spine, Liverpool
      Convener: José I. Crespo-Anadón (CIEMAT (Spain))
      • 64
        Searches for physics beyond the Standard Model with the Short-Baseline Near Detector

        The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber 110 m away from the Booster Neutrino Beam (BNB) target at Fermilab (Illinois, USA). The close location to the BNB origin makes the experiment sensitive to physics beyond the Standard Model (BSM) produced in the beam. Thanks to its advanced scintillation light detection system, a timing resolution at the nanosecond level further boosts the experiment capabilities. In this talk, we present the status and expected sensitivity to new BSM particles produced in the decay of mesons and in proton-target interactions in the BNB.

        Speaker: Rohan Rajagopalan
        NuFact2025_RohanR_SBND_BSM.pdf
      • 65
        MicroBooNE's beyond the Standard Model physics program

        MicroBooNE is an 85-tonne active mass liquid argon time projection chamber (LArTPC) at Fermilab. Between 2015-2021, the detector recorded neutrino interactions from the Booster Neutrino Beam (BNB) and Neutrinos at the Main Injector (NuMI) beams. MicroBooNE's capabilities for fine-grained tracking, particle identification, and calorimetry make it a powerful detector not just to explore neutrino physics, but also for Beyond the Standard Model (BSM) physics. This talk will discuss MicroBooNE's BSM program, including recently released searches for dark neutrino decay to an e+e- pair, dark trident processes, and heavy neutral leptons. The talk will also discuss the status of other ongoing analyses. Furthermore, we will present efforts to develop tools for BSM analyses that will also be useful for the upcoming Deep Underground Neutrino Experiment (DUNE).

        Speaker: Magnus Handley
        bsm_with_microboone_nufact_2025.pdf
    • WG6 Space 8 (The Spine, Liverpool)

      Space 8

      The Spine, Liverpool
      Convener: Tanaz Mohayai (Indiana University)
      • 66
        Commissioning and first data from T2K’s near detector upgrade

        T2K is a long-baseline experiment measuring neutrino and antineutrino oscillations by observing the disappearance of muon neutrinos, as well as the appearance of electron neutrinos, over a long 295km distance. The ND280 near detector at J-PARC plays a crucial role to minimise the systematic uncertainties related to the neutrino flux and neutrino-nucleus cross-sections as it measures the neutrino beam at a ND site before it oscillates. The ND280 detector has recently been upgraded with a new suite of sub-detectors: a high granularity SuperFGD with 2 million optically-isolated scintillating cubes read out by wavelength shifting fibres and 55000 Multi-Pixel Photon Counters; two horizontal Time-Projection Chambers instrumented with resistive Micromegas, and additionally six panels of scintillating bars for precise time-of-flight measurements. The installation and commissioning of the new detectors will be discussed together with detector calibrations of the new detectors and the ND280 Classic detectors.

        Speaker: Tristan Daret (Université Paris-Saclay (FR))
        2025_09_NuFact.pdf
      • 67
        Performance of the High-Angle Time Projection Chambers in the Upgraded T2K Off-Axis Near Detector

        The off-axis magnetic near detector of the T2K experiment has recently completed a significant upgrade, including the construction and installation of two new Time Projection Chambers (TPC) equipped with innovative resistive Micromegas technology and a field cage composed of thin composite walls. In this presentation, we will give an overview of the design and key features of the new TPCs, including their gas system, gas monitoring chambers, and data acquisition setup. We will also present performance results from extensive commissioning with neutrino beams and cosmic rays, along with comparisons to Monte Carlo simulations. The upgraded detectors demonstrate improved spatial resolution and enhanced particle identification performance, which are crucial for the precision goals of the T2K experiment.

        Speaker: Matteo Feltre (Universita e INFN, Padova (IT))
        nufact_feltre_hatpc.pdf
      • 68
        Long-term performance evaluation for eco-friendly Resistive Plate Chamber detectors

        Resistive Plate Chambers are gaseous detectors extensively used in several domains of Physics given their excellent time and space resolution.
        When operated in avalanche mode they make use of a high-performance high- Global Warming Potential gas mixture based on C2H2F4 and SF6, both fluorinated greenhouse components.

        The RPC ECOGas@GIF++ Collaboration is carrying on an intense R&D activity devoted to search for new eco-friendly gas mixtures for RPCs, complying with recent European regulations, and assessing their performance in different irradiation conditions on a long-term time scale.

        Different Resistive Plate Chambers, flushed with a HFO 1234ze-CO2 based gas mixture, have been exposed to high particle rates at the CERN Gamma Irradiation Facility (GIF++). During a 3 years-long ageing campaign, they have integrated O(100 mC/cm2) and their performance has been systematically evaluated, on a wide range of particle rates, by dedicated beam tests to study possible effects of ageing.
        In this talk, results on these studies together with their future perspectives will be presented.

        Speaker: Marilisa De Serio (Universita e INFN, Bari (IT))
        NuFact2025_DeSerio.pdf
      • 69
        Update on the PoWER Proposal for DUNE Phase II

        The Deep Underground Neutrino Experiment (DUNE) will utilize liquid argon time projection chamber (LArTPC) technology to address key questions in neutrino physics, such as CP violation and the neutrino mass ordering. The Phase II Far Detector modules will employ vertical drift single-phase LArTPCs with an active volume of 13 m × 13 m × 60 m and dual anode planes. We propose a novel photon detection system (PDS) concept, named PoWER (Polymer Wavelength-shifter and Enhanced Reflection). The design features full coverage of the field cage with polymeric wavelength-shifting foils (PEN), combined with enhanced specular reflector (ESR) panels and arrays of Light Detection Units (LDUs) mounted on the cryostat membrane. A combination of standard and VUV-sensitive SiPMs enables improved light collection and active vetoing through the surrounding liquid argon buffer. Additional PEN foils and reflective panels on the cathode further enhance photon detection efficiency. With an estimated 4% active coverage, this system aims to significantly improve sensitivity to low-energy signals, particularly from supernova neutrinos (~10 MeV). This contribution presents an update on Monte Carlo simulation studies, including photon light map generation, as well as the current status of prototype development and system integration.

        Speaker: Andre Fabiano Steklain Lisboa (The Federal University of Technology - Parana (BR))
        PoWER_NuFact25_Steklain.pdf
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • WG1 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Pierre Granger (CERN)
      • 70
        Supernova neutrinos in the DUNE experiment

        The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline experiment that will determine neutrino mass ordering (> 5$\sigma$), discover leptonic CP violation if nearly maximal violation, precisely measure neutrino oscillation parameters, observe astrophysical neutrinos, and search for processes beyond the standard model. The experiment will consist of four modules of Liquid Argon Time Projection Chamber detectors, with a total liquid argon mass of 70 kilotons, located 1.5 km underground at the Sanford Underground Research Facility in the USA. These modules are being designed to meet the specific requirements of low-energy physics searches. As a result, DUNE will be capable of detecting MeV-scale neutrinos from astrophysical sources. DUNE will offer unique sensitivity to electron neutrinos from a core-collapse supernova burst, with pointing capabilities. The talk will cover recent progress on the detection and reconstruction of supernova burst neutrinos in DUNE as well as the pointing capabilities.

        Speaker: Clara Cuesta Soria (CIEMAT)
        DUNE_SN_CCuesta_250901.pdf
      • 71
        Prospects for solar oscillation measurements at DUNE

        The Deep Underground Neutrino Experiment (DUNE) will provide a unique opportunity to simultaneously measure the oscillation parameters in the high- and low-energy regimes. DUNE's liquid argon time projection chamber (LArTPC) technology provides a charged-current (CC) and an elastic-scattering (ES) interaction channel that, when simultaneously exploited, enable precision measurements of the $^8$B flux and offer the opportunity to measure the much smaller hep flux. This talk will present recent simulations for DUNE's expected sensitivity to the $\Delta m^2_{21}$ and $\sin^2\theta_{12}$ oscillation parameters, the hep flux, and the day-night asymmetry characteristic of the Earth's regeneration effect. Additionally, we will discuss strategies for mitigating the backgrounds of such a challenging measurement.

        Speaker: Andres Lopez Moreno (Centre National de la Recherche Scientifique (FR))
        DUNE-solar-nuFact-2025-andresLopezMoreno.pdf
      • 72
        Reconstruction of Tau Neutrinos in LArTPC Detectors

        Our understanding of three-flavor neutrino oscillations has undergone significant improvement. However, most progress has come from studying $\nu_e$ and $\nu_\mu$ while the $\nu_\tau$ remains the least explored particle in the Standard Model. The Deep Underground Neutrino Experiment (DUNE), a next-generation long-baseline neutrino experiment under construction, is designed to address this gap.

        DUNE will deploy two high-resolution detectors exposed to the world's most intense neutrino beam: the Near Detector (ND) at Fermilab and the Far Detector (FD), 1,300 km away at the Sanford Underground Research Facility in South Dakota. With liquid argon time projection chamber (LArTPC) technology, DUNE's LArTPC detector will provide high statistics and excellent resolution capabilities, allowing us to make precision studies of oscillation parameters, search for CP violation in the lepton sector, test interaction models, and study phenomena that have, until now, seemed too complex to measure, like $\nu_\tau$ detection and therefore, provide the completion of the 3-flavor neutrino paradigm. $\nu_\tau$ data can impact a broad spectrum of open questions; among these include searching for non-standard neutrino interactions, constraining the unitarity of the PMNS matrix, and the unmeasured F₄ and F₅ structure functions for neutrino interactions.

        The DUNE FD, is also ideally suited to collect atmospheric $\nu_\tau$ . These events predominantly occur near the first atmospheric oscillation maximum and at a rate of ~1 CC-$\nu_\tau$ per kton-year. This atmospheric sample will provide a valuable complement to the beam data, enhancing sensitivity to three-flavor parameters and beyond the Standard Model scenarios.

        To address all these questions, a key factor is to get a reliable event reconstruction, which is challenging. For this, we apply machine learning techniques. In the context of the DUNE FD, I will present NuGraph, a graph neural network (GNN) that models detector hits as nodes linked by spatial and temporal edges for classification and event reconstruction for LArTPC detectors. I will also present a review of the significance of $\nu_\tau$ physics.

        Speaker: William Gregory Dallaway (University of Toronto (CA))
        NuFact2025_talk_09_02_25.pdf
        NuFact2025_talk_09_02_25.pdf
        NuFact2025_talk_09_02_25.pptx
    • WG2 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Elena Gramellini (University of Manchester)
      • 73
        Implementation of the Martini–Ericson–Chanfray–Marteau RPA-based (anti)neutrino cross section model in the GENIE neutrino event generator

        We present the implementation of the Martini–Ericson–Chanfray–Marteau RPA-based (anti)neutrino cross section model in the GENIE neutrino event generator. The implementation includes both the quasielastic (1p1h) and multinucleon (npnh) interaction channels. The presentation will begin with an overview of the theoretical foundations of the model. Validation steps are then discussed, along with comparisons to other models currently available in GENIE. We then show predictions for cross sections on $^{12}$C, $^{16}$O, and $^{40}$Ar, and compare them with relevant experimental data. In particular, we highlight comparisons with the T2K simultaneous measurement of the muon neutrino charged-current cross section on oxygen and carbon without pions in the final state, and with the MicroBooNE multi-differential cross section measurements of $\nu_{\mu}$ - argon quasielastic-like interactions.

        Speaker: Lavinia Russo (Centre National de la Recherche Scientifique (FR))
        LaviniaRUSSO_MartiniImpl.pdf
      • 74
        Understanding neutrino pion production with the GiBUU model

        Pion production is one of the critical interaction systematic uncertainties in neutrino oscillation measurements. Recent GiBUU development has introduced many improvements in the treatment of pion production, including the $2\pi$ background in neutrino interactions. We present a comprehensive study of charge current neutrino-induced pion production with the GiBUU model by examining the processes contributing to pion production, including resonant, non-resonant, and background amplitudes, with a particular focus on the newly implemented $2\pi$ background. By comparing model predictions with experimental data from MINERvA, T2K, and MicroBooNE, we analyze the effects of in-medium modifications including NN cross modifications in $\Delta$ production and final-state interactions on observables such as transverse kinematic imbalance. The results show that these measurements can be adequately described with ad hoc combinations of model components, revealing the complexity and richness of the underlying nuclear dynamics.

        Speaker: Qiyu Yan
        Understanding neutrino pion production with the GiBUU model-4.pdf
      • 75
        Spectral function approach in NuWro: modelling of multinucleon final states in quasielastic scattering

        Reliable theoretical modeling of neutrino-nucleus interactions is an essential requirement for current and next-generation neutrino-oscillation experiments, such as MicroBooNE and DUNE, which use argon as the target material. In this talk, I will present recent advancements in the treatment of the quasi-elastic (QE) channel in the NuWro Monte Carlo event generator. We implement the state-of-the-art argon spectral functions extracted from Jefferson Lab (JLab) experiment E12-14-012, separating its mean-field and correlated components. In addition to low energy corrections, such as nuclear recoil and Coulomb distortions, we implement a consistent treatment of final state interactions and short-range NN correlations, which may lead to multi-nucleon final sates. The impact of these critical improvements is tested against electron scattering data and MicroBooNE exclusive cross sections.

        Speaker: Mr Rwik Dharmapal Banerjee (University of Wrocław doctoral student)
        SF_Rwik_NuFact25.pdf
      • 76
        NuWro release 25.03

        NuWro, a state-of-the-art Monte Carlo generator developed by theorists at the University of Wroclaw, simulates neutrino-nucleus interactions. This talk will demonstrate NuWro's capabilities, methodologies, and applications in simulating neutrino-nucleus interactions across a wide energy range, from a few MeV's to hundreds of GeV. Lastly, I will present the highlights of NuWro v25.03 which was released in March, 2025. I will go through the new Hybrid Model for single pion production model and the new MEC model which is based on NuWro implementation of the Valencia 2020 Model. I will also discuss the recent developments in the field of machine learning within Wroc{\l}aw group

        Speaker: Hemant Prasad
        NuFact2025_Hemant.pdf
    • WG3+WG4 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Simon Corrodi
      • 77
        Progress and Prospects for Muon Cooling and Acceleration at J-PARC

        Acceleration of cooled muons is a promising technology for realizing a low-emittance muon beam, which is essential for noble muon sciences such as precise measurements of the muon dipole moments and muon microscopy. This technology is being developed at the Material and Life science experimental Facility at J-PARC. There, muons are cooled down to thermal energy though Muonium formation followed by laser ionization. The resulting cooled muon beam, known as ultraslow muon, is then reaccelerated using a radio-frequency cavity.

        In 2024, we achieved the world’s first successful radio-frequency acceleration of positive muons to 100 keV. The normalized emittance of the reaccelerated beam was measured to be <$1~\pi$ mm mrad, representing a >100 reduction compared to conventional surface muon beams. Construction of both the ultraslow muon source and cavities is ongoing to achieve the acceleration up to 200 MeV with an intensity of $10^5~\mu/{\rm s}$ by 2030. In this contribution, we present the recent result and prospects of these activities.

        Speaker: Masato Kimura (IPNS, KEK)
        NuFACT2025_MuAcc.pdf
      • 78
        Secondary Beams at Jefferson Lab

        High-intensity proton beams are routinely used to generate secondary beams of particles such as neutrinos and muons.. High-current (∼100 µA), medium-energy (1 - 10 GeV), continuous-wave electron beams with a delivered large integrated charge (∼1000 C/y) can be also used to generate secondary beams. After interaction with a thin target in fixed-target experiments at the Thomas Jefferson National Accelerator Facility (Jefferson Lab), the electron beam is deposited on a block of material (beam "dump") where electrons produce showers, degrading the initial energy down to values at which ionization and excitation of atoms dominates. If the primary beam’s initial energy is higher than the pion production threshold, hadronic interaction and electromagnetic processes contribute to the production of a sizable number of secondary particles that may re-interact or escape from the dump material. The beam dump is usually surrounded by heavy shielding (e.g., a thick concrete vault) to minimize the escaping radiation. Nevertheless, a significant flux of neutrons, muons, and neutrinos propagate through the shielding, making intense secondary beams that may provide an opportunistic extension of investigations performed with the primary electromagnetic probe. Monte Carlo simulations for secondary beams produced from an 11 GeV electron beam at JLab experimental Hall A have been published that predict a secondary neutrino beam with a typical decay-at-rest energy spectrum providing up to ∼7×10⁻⁵ ν/EOT when integrated over a 1 m² detector located 10 m above the beam dump. Considering a delivered charge of 10²² EOT per year, the annual neutrino flux would be in the range of 1018 ν. Possibilities and plans for this potential new facility will be discussed.

        Speaker: Cynthia (Thia) Keppel
        NuFact2025_Keppel.pdf
        NuFact2025_Keppel.pptx
      • 79
        Design Progress of MuST: A High-Intensity Muon Source Based on a Superconducting Linac

        A high-intensity muon source named MuST has been proposed for several years at IMPCAS in China. Utilizing the 5-mA proton beam of CiADS linac on targets, multiple muon beamlines can be fed, and the intensity of the DC muon beam is expected to be record-breaking. Here, the conceptual layout of MuST, including the tandem targets, the muon beamlines, and the terminals, is presented. The plan and the conceptual design progress are reported. The study of the liquid jet target, which is more efficient in producing surface muons than graphite and has the potential to withstand a 3-MW proton beam, is presented. The design logic of the muon beamlines is introduced, and the main parameters of the muon beams are given.

        Speaker: Han-Jie Cai (Institute of Modern Physics, Chinese Academy of Sciences)
        Design Progress of MuST_ A High-Intensity Muon Source Based on a Superconducting Linac.pdf
    • WG5 Space 9 (The Spine, Liverpool)

      Space 9

      The Spine, Liverpool
      Convener: Ellen Sandford (The University of Liverpool)
      • 80
        Constraining neutrinophilic mediators at Forward Physics Facilities

        High energy collider neutrinos have been observed for the first time by the FASER$\nu$ experiment. The detected spectrum of collider neutrinos scattering off nucleons can be used to probe neutrinophilic mediators with GeV-scale masses. We perform an analysis on the measured muon spectra at FASER$\nu$, and find that the bounds on the vector mediator from the current FASER$\nu$ data are comparable to the existing bounds at $m_{Z^\prime}\approx 0.2$ GeV. We also study the sensitivities to a neutrinophilic mediator at future Forward Physics Facilities including FLArE and FASER$\nu$2 by using both the missing transverse momentum and the charge identification information. We find that FLArE and FASER$\nu$2 can impose stronger bounds on both the scalar and vector neutrinophilic mediators than the existing bounds. The constraints on the scalar mediator can reach 0.08 (0.1) for $m_\phi\lesssim1$ GeV with (without) muon charge identification at FASER$\nu$2.

        Speaker: Jiajun Liao
        FASERv_nufact_liao.pdf
      • 81
        Searching for Generic Long-lived Particles with the SBND Cosmic-Ray Tagger Modules

        The Short-Baseline Near Detector (SBND) is one of three Liquid Argon Time Projection Chamber (LArTPC) detectors used in the Short-Baseline Neutrino (SBN) programme at Fermilab. As the near detector in the SBN programme, the SBND is located just 100 metres from the target along the Booster Neutrino Beam (BNB). SBND offers sensitivity to a broad range of new physics scenarios, including the potential production and decay of generic long-lived particles. These particles could be produced through neutrino–nucleus scattering and then decay into lepton pairs as they travel through the detector region. Although full data-taking with the SBND LArTPC began last summer, the bottom layer of the Cosmic Ray Tagger (CRT) system, consisting of plastic scintillator modules, was installed between 2017 and 2019 and collected a substantial dataset using the BNB. Originally intended for performance and commissioning studies, this dataset also provides an opportunity to search for long-lived particle decays. In this talk, I will present a search for decays into electron–positron pairs using CRT data.

        Speaker: Jiaoyang/ 娇瑒 Li/李 (Fermi National Accelerator Laboratory)
        NuFact_2025_LLPSearch_SBND_CRTBT_LiJiaoyang.pdf
      • 82
        T violation searches with DUNE and T2HK

        The standard approach to observing Time reversal (T) symmetry violation formally corresponds to exchanging neutrino flavors of the neutrino source and detector, which is experimentally challenging. We propose an alternative framework to test T violation without interchanging the source and detector, but using the L-odd components in the transition probabilities. We compare the data at different baselines but at the same neutrino energies feasible with experiments under consideration. We build a theoretical framework to test the T-violation in a model-independent way, including various scenarios for new physics contributions. We perform extensive numerical simulations for the DUNE and T2HK experiments, understanding the crucial role of near-detector precision, detector resolution, and exposure. We also analyze the standard three-flavor picture and find much enhanced sensitivities.

        Speaker: Kiran Sharma
        NuFact_2025_Kiran.pdf
    • WG6 Space 8 (The Spine, Liverpool)

      Space 8

      The Spine, Liverpool
      Convener: Tanaz Mohayai (Indiana University)
      • 83
        Photon-Detection System of DUNE Far Detector

        The Deep Underground Neutrino Experiment (DUNE) is a dual-site experiment for long-baseline neutrino oscillation studies, capable of resolving the neutrino mass hierarchy and CP-violation. DUNE will also be sensitive to supernova neutrinos and processes beyond the Standard Model. The Far Detector (FD) will consist of four liquid argon TPCs (17 kton each) equipped with systems for detecting charge and scintillation light produced during ionization. The charge detection system enables both calorimetry and position determination. In addition, the photon-detection system (PDS) enhances the detector capabilities for all DUNE physics drivers. The PDS of the first two FD modules consists of light collector modules, the so-called X-Arapucas, that captures wavelength-shifted (WLS) photons inside boxes where a WLS plate guides the 400 nm photons to SiPMs facing the side surfaces. This presentation will outline their functionality and the operational tests carried out in the lab and its performance in ProtoDUNE.

        Speaker: Carmen Palomares (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
        DUNE_PDS_NUFACT2025.pdf
      • 84
        Preparation of 50cm PMTs for Hyper-Kamiokande experiment

        Hyper-Kamiokande, the next-generation Water-Cherenkov detector, is being prepared to start operation in 2028 to reveal the neutrino properties and to search for nucleon decays.
        It utilizes approximately 20,000 newly designed 50-cm PMTs, which are produced by Hamamatsu Photonics as R12860, to detect the Cherenkov light emitted in the inner detector with higher photon detection efficiency, charge and time resolution, and hydrostatic pressure tolerance much higher than the PMTs used in Super-Kamiokande. The mass production of the PMTs started in 2020 and since then the properties of the delivered PMTs including the response to incoming photons and the amount of the dark noise are measured as a quality assurance. In the measurement, more than hundreds of PMTs are monitored in dedicated dark rooms for one month or longer to check the stability, which is important property as Hyper-Kamiokande is scheduled to be operated for more than 10 years.
        Throughout my talk, I will present our measurement setup and the results based on the measurement of more than 2,000 PMTs.

        Speaker: Takuya Tashiro
        2025Nufact_HKPMT_Tashiro.pdf
      • 85
        Multi-Photomultiplier Detectors in the Water Cherenkov Test Experiment

        The Water Cherenkov Test Experiment (WCTE) at CERN is designed to test various technologies and techniques related to water Cherenkov detectors, which may later be implemented in the Hyper-Kamiokande experiment. WCTE consists of 97 multi-PMT photosensors placed in a water tank (~3.8 m in diameter, ~3.6 m in height, total water mass ~41 tonnes). Each multi-PMT contains nineteen 3" PMTs and associated front-end electronics, all enclosed in a watertight pressure vessel. The same mPMT design, with improvements, will be used in the IWCD (Intermediate Water Cherenkov Detector). A similar design—capable of withstanding higher pressure and featuring lower power consumption—will be deployed in the Far Detector of Hyper-Kamiokande.

        In this talk, we will focus on the design and production of the mPMT detectors for WCTE, describing quality assurance measures, assembly procedures, and initial testing. We will also present the methods used to evaluate the electronics performance and the parameters of the 3-inch PMTs. Finally, we will describe the results of data analysis from the gain and timing calibrations for modules installed in the WCTE detector.

        Speaker: Krzysztof Dygnarowicz (Warsaw University of Technology (PL))
        NuFact_2025­_WCTE_mPMT_Usage_Dygnarowicz_final.pdf
        NuFact_2025­_WCTE_mPMT_Usage_Dygnarowicz_final.pptx
        NuFact_2025­_WCTE_mPMT_Usage_Dygnarowicz_final_v2.pdf
      • 86
        The Hyper-Kamiokande Light Injection Calibration System

        The upcoming Hyper-Kamiokande experiment is a next-generation water Cherenkov experiment which will be based in Japan. Hyper-K aims to make precision measurements of CP-violation and other neutrino oscillation parameters, atmospheric and solar neutrinos, supernova neutrinos, and proton decay. With a fiducial volume approximately eight times larger than its predecessor Super-Kamiokande, Hyper-K will become systematically limited, and therefore such precision measurements require accurate detector calibration.

        The Hyper-K Light Injection (LI) system will be a key part of the calibration programme, injecting measured pulses of light into the detector volume in order to precisely measure photomultiplier tube (PMT) charge and timing response, as well as optical parameters of the water. In the inner detector (ID) volume, 33 injector positions will each feature a wide-angle diffuser and narrow-angle collimator. The outer detector (OD) volume will be instrumented with 122 diffusers and 12 collimators.

        This talk will focus on the design, development and testing of the LI system components, from light sources to injectors, as well as presenting preliminary studies of its application to measuring water parameters.

        Speaker: Dr Sam Jenkins (University of Liverpool)
        NuFact_HKLI_SJenkins.pdf
  • Wednesday 3 September
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Plenary: Short Poster Talks Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: yun tse tsai (SLAC)
      • 96
        Hyper Kamiokande
        Speaker: Dr Veera Mikola (University of Glasgow)
        NuFactTalk_VMikola_final.pdf
      • 97
        DUNE
        Speaker: Pierre Granger (CERN)
        nufact_dune.pdf
      • 98
        Beyond PMNS with Lepton Number Violation
        Speaker: Chandan Hati (Instituto de Física Corpuscular (IFIC), CSIC‐Universitat de València, Spain)
        Nufact_25_Hati.pdf
    • Lunch Break The Spine, Liverpool

      The Spine, Liverpool
  • Thursday 4 September
    • Plenary Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Megan Friend (KEK High Energy Accelerator Research Organization (JP))
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • WG1+WG3 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Maja Olvegaard (Uppsala University (SE))
      • 101
        The implementation of a monitored and tagged neutrino beamline at CERN for the nuSCOPE expereiment

        The poor knowledge of neutrino cross sections at the GeV scale is projected to be responsible for some of the leading sources of uncertainty in next-generation oscillation experiments. Building on the ideas and R&D from ENUBET and NuTAG, we present a proposal for the nuSCOPE experiment (see arXiv:2503.21589). nuSCOPE is a high-precision, short-baseline neutrino experiment at CERN that employs neutrino monitoring and tagging. Instrumentation placed along the beamline and inside the decay tunnel enables percent-level flux monitoring and a neutrino energy determination that is independent of final-state particle reconstruction at the neutrino detector. In this talk, we present the beamline design, proposed instrumentation technologies, results from prototyping efforts, and scenarios for implementation at CERN. A talk proposed in WG2 will cover the physics reach of the experiment.

        Speaker: Marc Andre Jebramcik (CERN)
        25_09_04_nuFACT.pdf
      • 102
        Hadron Production Measurements for Neutrino Beams in NA61/SHINE

        Long-baseline accelerator neutrino experiments rely on the neutrinos from the decays of hadrons produced in hadron-nucleus interactions. Uncertainties in the hadron production yields from these interactions dominate the neutrino flux uncertainties in these beams. This talk will highlight recent results from CERN’s SPS Heavy Ion and Neutrino Experiment (NA61/SHINE), which has produced measurements that strongly constrain the neutrino and anti-neutrino fluxes in the T2K experiment and is currently producing measurements to improve modeling of the fluxes for the Fermilab neutrino program. The talk will also present the prospects for future hadron production measurements in NA61/SHINE.

        Speaker: Alysia Marino (University of Colorado Boulder (US))
        NuFact_2025.pdf
      • 103
        Neutrino flux predictions from the J-PARC beam

        The Tokai-to-Kamioka (T2K) experiment uses high intensity beams of neutrinos and anti-neutrinos produced at the Japan Proton Accelerator Research Complex (J-PARC) to measure neutrino oscillations over a baseline of 295 km, and search for evidence of CP violation. Neutrinos come from in-flight decays of charged hadrons produced from interactions of 30 GeV protons in a long graphite target. The intrinsic challenges associated with accurate modelling of hadronic interactions that lead to neutrino production have been the primary motivation for the T2K Collaboration to develop a robust flux tuning approach for the J-PARC neutrino beam. The modelled flux prediction is tuned to external data from hadron-production experiments, notably including measurements collected by the NA61/SHINE experiment using a replica of the T2K target. A comprehensive summary of the T2K flux calculation method will be presented and active areas of development with scope for future systematic error improvement will be discussed.

        Speaker: Ian Heitkamp
        Final - NuFact Flux Presentation - Ian H.pdf
        Final - NuFact Flux Presentation - Ian H.pptx
      • 104
        First detection of a tagged neutrino in the NA62 experiment

        Neutrino tagging is a new experimental approach for accelerator-based neutrino experiments. The method consists in associating a neutrino interaction with the meson decay (i.e. or ) in which the neutrino was originally produced. The properties of the neutrino can then be estimated kinematically from the decay incoming and outgoing charged particles. The reconstruction of these particles relies on recent progress and developments in silicon particle detector technology. The method is particularly suited to study neutrino interactions in short baseline experiments, and preliminary works indicate that they could also be used to study neutrino oscillations at long baseline experiments. A proof-of-principle of this method has been performed using the NA62 experiment as a miniature tagged neutrino experiment. The intense kaon beam of NA62 abundantly produces neutrinos through the decay. The two spectrometers of the experiment are used to reconstruct the and and the neutrino interaction is detected in the 20 ton of liquid krypton of the electro-magnetic calorimeter. The results of the analysis based on the data collected in 2022 are presented, where one tagged neutrino candidate has been detected for the first time in history.

        Speaker: Radoslav Marchevski (École Polytechnique Fédérale de Lausanne (EPFL))
        4-09-NuTagging-NuFact25-Liverpool.pdf
    • WG2 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Dr Sam Jenkins (University of Liverpool)
      • 105
        Recent results from the SND@LHC Experiment

        The SND@LHC experiment was designed to perform measurements with neutrinos produced at the LHC within the unexplored pseudo-rapidity range of 7.2 < 𝜂 < 8.6. Located 480 m downstream of IP1 in the unused TI18 tunnel, this compact and stand-alone experiment employs a hybrid detector system consisting of 800 kg of tungsten plates interleaved with emulsion and electronic trackers, complemented by a calorimeter and a muon detection system. This configuration allows for the efficient identification of all three neutrino flavors, thereby opening new
        opening a unique opportunity to probe the physics of heavy flavour production at the LHC, particularly in regions inaccessible to existing experiments such as ATLAS, CMS, and LHCb.
        Exploring this region is also crucial for future circular colliders and predictions of very high-energy atmospheric neutrinos. Furthermore, the detector's design is adept at searching for Feebly Interacting Particles through distinctive scattering signatures. Since its initiation in 2022, the SND@LHC experiment has successfully operated during LHC Run 3 and collected 290 fb^−1 of data. This presentation will summarize the results obtained thus far, the methodologies employed, and the implications for advancing our understanding of neutrino physics.

        Speaker: Guilherme Soares
        NuFact_2025_SNDLHC.pdf
      • 106
        Searching for collider neutrinos with FASER

        The ForwArd Search ExpeRiment (FASER) is designed to search for particles produced in the far-forward region of pp collisions at the LHC at CERN. Its primary goals are to detect high-energy neutrinos and light, feebly interacting new particles predicted by extensions of the Standard Model. Since its inception in 2022, FASER has collected close to 200/fb of data during LHC Run 3, leading to groundbreaking results on collider neutrinos. These include the first ever observation of electron and muon neutrinos produced at a particle collider, measurements of their interaction cross sections, and the first differential cross section and flux measurements of muon and anti-muon neutrinos in the TeV range. In this talk, an overview of the detector, recent neutrino results, and future prospects of FASER will be presented.

        Speaker: Simon Thor (ETH Zurich (CH))
        FASER NuFact 2025.pdf
      • 107
        Precision neutrino interaction measurements with the nuSCOPE experiment

        The poor knowledge of neutrino cross sections at the GeV scale is projected to be responsible for some of the leading sources of uncertainty in next-generation oscillation experiments. Building on the ideas and R&D from ENUBET and NuTAG, we present a proposal for the nuSCOPE experiment (see arXiv:2503.21589). nuSCOPE is a high-precision, short-baseline neutrino experiment at CERN that employs neutrino monitoring and tagging. This allows for an exceptionally well controlled muon and electron neutrino flux, with the extraordinary capacity to reconstruct neutrino energy on an event-by-event basis. The opens up the possibility for a wealth of cross-section measurements usually reserved only for electron-scattering experiments. In this talk we show highlights of projected measurements, demonstrating the experiment's unique ability to directly measure aspects of neutrino interaction physics responsible for dominant sources of systematic uncertainty for the upcoming DUNE and Hyper-K experiments, including neutrino energy response functions and muon/electron neutrino cross-section ratios. A talk proposed for WG3 will cover the implementation of the monitored and tagged beamline.

        Speaker: Laura-Iuliana Munteanu (CERN)
        nuSCOPE_Munteanu.pdf
      • 108
        nCTEQ global analysis of nuclear PDFs

        We present a new global analysis of nuclear PDFs in the nCTEQ approach. Building on a modern proton baseline without nuclear data, we combine and update previous separate analyses that focused on JLab neutral-current DIS, neutrino DIS and dimuon production, and the currently available LHC data, in particular on W/Z and heavy quark production. For the latter, we not only employ a data-driven approach, but also perform an alternative fit based on NLO QCD and the ACOT variable flavor number scheme. As a result, we obtain PDFs with reduced uncertainties in both the high-x and low-x regimes, in particular for the gluon and the strange quark. We also present predictions for observables that were not included in this analysis.

        Speaker: Tomas Jezo (WWU ITP)
        TJezo.pdf
    • WG4 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Simon Corrodi
      • 109
        Status of the Mu2e experiment

        The Mu2e experiment at Fermilab will search for the coherent, neutrinoless conversion of a negative muon into an electron in the field of an aluminum nucleus, an example of Charged Lepton Flavor Violation (CLFV). Observation of CLFV at Mu2e would be an unambiguous signal of physics beyond the Standard Model (BSM). Mu2e aims to improve upon the current best sensitivity on the conversion rate by four orders of magnitude, reaching a single event sensitivity of $3 \times 10^{-17}$, exploring a wide range of BSM models and probing mass scales up to $10^4$ TeV. To achieve this goal, Mu2e will utilize a system of superconducting solenoids to create an intense pulsed muon beam, with about $10^{10}$ stopped $\mu^-/s$. For Run I, the expected 5$\sigma$
        discovery sensitivity is $R_{\mu e} = 1.2 \times 10^{-15}$, with a total expected background of $0.11 \pm 0.03$ events. In the absence of a signal, the expected upper limit is $R_{\mu e} < 6.2 \times 10^{-16}$ at 90$\%$ CL. Mu2e is approaching a very important phase. Construction is almost complete. Commissioning will begin shortly and physics data-taking is scheduled to begin in 2027. This talk will explore the theoretical motivations, design, and current status of the Mu2e experiment.

        Speaker: Namitha Chithirasreemadam (University of Pisa)
        NamithaMu2eNuFact.pdf
      • 110
        Current Status and Prospects of the COMET Experiment at J-PARC

        The COMET experiment at J-PARC is designed to search for the neutrinoless, coherent conversion of a muon to an electron in the field of a nucleus ($\mu^-N \to e^-N$), a process that violates charged lepton flavor conservation and is forbidden in the Standard Model. The experiment aims to reach a single-event sensitivity of $\mathcal{O}(10^{-17})$, improving the current upper limit by four orders of magnitude. To achieve this, COMET utilizes a system of superconducting solenoids. Before full implementation, including the electron transport magnet, the experiment will begin with an initial stage to study the detailed characteristics of the muon beam, along with conducting detection of 105 MeV/c electrons. Even at this stage, a sensitivity of $10^{-15}$ is expected, already achieving 100 times better than the previous experiment. This contribution presents the current status and progress of the construction, and outlines the future plan toward achieving full sensitivity.

        Speaker: Ryo Nagai
        COMET-Status-NuFact.pdf
      • 111
        Future perspectives for $\mu \to e \gamma$ searches

        Searches for charged lepton flavor violation in the muon sector stand out among the most sensitive and clean probes for physics beyond the Standard Model. Currently, $\mu^+ \to e^+ \gamma$ experiments provide the best constraints in this field and, in the coming years, new experiments investigating the processes of $\mu^+ \to e^+e^+e^-$ and $\mu \to e$ conversion in the nuclear field are anticipated to surpass them. However, it is essential to maintain comparable sensitivities across all these processes to fully leverage their potential and differentiate between various new physics models if a discovery occurs. This talk will discuss ongoing efforts to develop a future experimental program aimed at improving the sensitivity of $\mu^+ \to e^+ \gamma$ searches by one order of magnitude within the next decade.

        Speaker: Paolo Walter Cattaneo (Pavia University and INFN (IT))
        NuFact2025.pdf
    • WG5 Space 9 (The Spine, Liverpool)

      Space 9

      The Spine, Liverpool
      Convener: Chandan Hati (Instituto de Física Corpuscular (IFIC), CSIC‐Universitat de València, Spain)
      • 112
        Physics potential of solar neutrino detection with JUNO

        The JUNO detector (Jiangmen Underground Neutrino Observatory), located in Jiangmen, southern China, is currently in its commissioning phase. Its main goal is to determine the neutrino mass ordering and to reduce uncertainties on oscillation parameters. Thanks to its huge liquid scintillator mass (20 kton), its high radiopurity and excellent energy resolution, JUNO is an ideal candidate to detect solar neutrinos.
        JUNO solar neutrino program covers both the high energy region ($\gtrsim 3$ MeV) of the spectrum, dominated by $^8$B neutrinos, and the intermediate energy region (between 0.5 and 1.5 MeV), dominated by $pep$, CNO and $^7$Be neutrinos.

        $^8$B neutrinos, due to their high energy, can be detected via the charged currents, neutral current and elastic scattering channels, that allow model-independent flux measurements. At the same time $^8$B neutrino measurements can provide $\sin\theta_{12}$ and $\Delta m^2_{12}$ measures independently from the values calculated with reactor neutrino analysis. Possible discrepancies between the values could be an indication of non-standard interactions.

        The intermediate energy region will instead be more strongly influenced by the contamination levels. However, even assuming the minimal radiopurity, JUNO will be able to improve current measurements of $^7$Be neutrino fluxes, thereby placing more stringent constraints on current solar models.

        This contribution will focus on JUNO sensitivity to solar neutrinos, highlighting the potential impact of these measurements both on the refinement of the Standard Solar Model and on the advancement of neutrino physics, particularly in probing oscillation parameters and exploring possible new physics scenarios.

        Speaker: Claudio Coletta (Università di Milano-Bicocca e INFN-MIB)
        [NuFACT 2025] Physics potential of solar neutrino detection with JUNO.pdf
      • 113
        eV and keV sterile neutrinos search with the KATRIN experiment

        The KATRIN experiment is designed to measure the mass of the electron antineutrino by studying the high-energy end of the tritium β decay spectrum. In addition, KATRIN is also a well-suited instrument to explore the sterile neutrino hypothesis. The existence of sterile neutrinos would cause a kink-like distortion in the spectrum.

        Using the same datasets as for active neutrino mass, KATRIN has recently presented new results on the search for sterile neutrinos at the eV scale, complementing the reactor and radioactive source experiments. With an endpoint of 18.6 keV, KATRIN also offers a high potential for the search for sterile neutrinos in the keV range. With data acquired during the 2018 commissioning campaign, KATRIN reported results from a search for keV-scale neutrinos in the restricted mass range of 0.01 to 1.6 keV. The current KATRIN detector is not designed to handle the higher count rate that occurs with a wider mass range. Equipped  with the TRISTAN detector, KATRIN aims to search for keV sterile neutrinos across the full tritium beta decay spectrum. This detector is currently in production and is scheduled to be operational in KATRIN in 2026.

        In this talk, I will present the latest results from KATRIN on the search for sterile neutrinos at eV and keV scales, as well as the ongoing efforts to conduct a highly sensitive search for the sterile neutrino at keV scales with TRISTAN.

        Speaker: Anthony Onillon (Max-Planck-Institut für Kernphysik)
        AO_NuFact2025.pdf
    • WG6 Space 8 (The Spine, Liverpool)

      Space 8

      The Spine, Liverpool
      Convener: Dr Akira Takenaka (Shanghai Jiao Tong University, Tsung-Dao Lee Institute)
      • 114
        Deep Learning at DUNE

        DUNE is the flagship next-generation neutrino experiment in the United States, designed to decisively measure neutrino CP violation and determine the mass hierarchy. It utilizes the Liquid Argon Time Projection Chamber (LArTPC) technology, which provides exceptional spatial resolution and the potential to accurately identify final state particles and neutrino interactions. However, the high-resolution LArTPC at DUNE also increases the complexity of reconstructing and identifying these interactions. Deep learning techniques offer a promising solution to this problem. At DUNE, convolutional neural networks, graph neural networks and transformers are being developed and have already shown promising results in signal processing, kinematic reconstruction, clustering and interaction/particle identification. Deep learning methods have also been widely applied to areas beyond reconstruction at DUNE. In this talk, I will review the development of these deep learning–based approaches within the DUNE experiment.

        Speaker: Prof. Jianming Bian (University of California Irvine (US))
        DUNEDL_2025_09_04.pdf
      • 115
        Development of the computing framework for monitoring the quality of ProtoDUNE offline data

        ProtoDUNE is a Liquid Argon Time Projection Chamber (LArTPC) and one of the prototypes for the future Deep Underground Neutrino Experiment (DUNE). Besides testing and improving LArTPC detection performance, ProtoDUNE goals also reside in exploring the interaction of charged particles with Liquid Argon to enhance the particle reconstruction capabilities for the future neutrino interactions in DUNE. In view of the upcoming data taking campaign for ProtoDUNE Vertical Drift, we are looking forward to developing and improving the Offline Data Quality Monitoring framework to evaluate the quality of data recorded by the detector and the performance of its current processing algorithms. By monitoring offline data, we identify the metrics that determine the data quality, make relevant plots and release this information for the collaborators in a graphic user interface. In this talk, we present the DUNE computing infrastructure used for developing the framework, from data processing to visualization in the front-end website, highlighting the flexibility of the tool in retrieving processed data from different sources across the Collaboration working groups. Finally, we will also discuss the plans for extending the offline data quality monitoring to the Monte Carlo samples from production campaigns.

        Speaker: Gabriela Vitti Stenico (The University of Edinburgh)
        GVS_NuFact2025.pdf
      • 116
        Track Matching Across Detectors: Using GNNs to Match Particles across DUNE’s Near Detector Prototypes

        In the global scientific effort to better understand how neutrinos fit (or don’t) within the bounds of the Standard Model, the Deep Underground Neutrino Experiment (DUNE) aims to make precise neutrino oscillation measurements to determine the neutrino mass ordering and determine the value of neutrino Charge-Parity (CP) violation. To accomplish this, DUNE has a host of near detectors that will be placed by the source of the world’s most intense accelerator neutrino beam to characterize the neutrino interactions and to constrain measurements performed 1300 km away at the far detectors’ site. To capture particles leaving the Liquid Argon (LAr) near detector volume, especially muons, a muon tagger is placed downstream. Precisely matching the particles across the detectors during the reconstruction phase can help improve the final Particle ID determination and help us cope with the very large pile-up expected in the intense neutrino beam. This work shows the potential of using Graph Neural Networks (GNNs) to connect track segments between the solid scintillator detector planes to the central Liquid Argon detector region. This is being developed using the current setup with DUNE’s prototype Liquid Argon near detector “2x2” and the solid scintillator muon tagger provided by repurposed MINERvA planes.

        Speaker: Dr Jessie Micallef (Tufts University (and MIT))
        MicallefJ_NuFact2025_GNNMatch.pdf
    • Lunch Break The Spine, Liverpool

      The Spine, Liverpool
    • SPC Meeting Wolfson Lecture Theater (The Spine, Liverpool)

      Wolfson Lecture Theater

      The Spine, Liverpool
    • WG1+WG5 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      • 117
        Alternate presentations of neutrino oscillation results from T2K for the precision era

        Current neutrino experiments are making world-leading measurements of the PMNS parameters and will continue to collect data and improve their analyses to push towards the precision era, which will be fully realised with the next generation of oscillation experiments. These next-generation experiments will not only be able to make precision measurements of the PMNS parameters but will also be able to test the assumption of unitarity itself. To achieve this goal, the experiments’ constraints should be presented in a new way that can directly show non-unitarity or allow theorists and global fitters to make combinations without assuming unitarity. Some of such possible presentations will be discussed.
        Many of these alternative presentations can already be implemented as reparameterisations of existing 3-flavour fit results. Starting to incorporate these presentations in such a way already now, although not a test of unitarity itself, will move the community to get accustomed to these new ways of presenting oscillation results. This talk will show such reparameterisations of the official T2K 3-flavour result.

        Speaker: Marvin Pfaff (Imperial College (GB))
        NuFACT_T2KNewPresentations_Talk25.pdf
      • 118
        Unitarity Test for Lepton Mixing

        We study a method to test the unitarity of the PMNS matrix by using only
        the long baseline neutrino oscillation experiment, such as the combination of
        the T2HK experiment and the one with the $\nu_e$ beam from a future neutrino
        factory at J-PARC. Without a specific parametrization, one can directly extract
        the elements of the lepton mixing matrix by observing the energy dependence of
        the oscillation probabilities. A non-trivial test of the unitarity under the three-
        generation assumption can thus be made possible by examining the orthogonality
        in a similar manner to the unitarity triangle in the quark sector. As the first
        trial, we perform the analysis based on the simplified situation where the matter
        effects in the neutrino oscillation are absent. The simplification is not expected
        to significantly affect the results since we use the $\nu_\mu \to \nu_e$ and $\nu_e\to\nu_\mu$ channels,
        whose difference is sensitive to the CP phase, while it is insensitive to the matter
        effects. Under this simplified analysis, we find that the combination of T2HK
        and neutrino factory experiments can exclude, for example, four-generation based
        models to explain anomalies in short baseline experiments by the unitarity test
        at the $3\sigma$ level for a sufficient (but realistic) flux of the $\nu_e$ beam.

        Speaker: Sho Sugama (Yokohama National University)
        NuFact2025_ShoSugama.pdf
      • 119
        Investigations of the MiniBooNE anomaly and sterile neutrinos with MicroBooNE

        MicroBooNE uses a liquid argon time projection chamber (LArTPC) detector to investigate the observed anomalous low energy excess (LEE) of single electromagnetic shower events reported by the MiniBooNE experiment. After five years of data taking from two accelerator beamlines at Fermilab, MicroBooNE has recently published results testing explanations for the MiniBooNE anomaly, including three single-photon searches spanning multiple underlying processes and topologies, and an electron neutrino search utilizing the full 5-year dataset collected with the Booster Neutrino Beam (BNB). Additionally, we present the status of MicroBooNE's 3+1 sterile neutrino oscillation analysis leveraging both the BNB and Neutrinos at the Main Injector (NuMI) beamlines.

        Speaker: Dr Jessie Micallef (Tufts University (and MIT))
        MicallefJ_OscMicroBooNE_NuFact25 (1).pptx
    • WG2 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Dr Sam Jenkins (University of Liverpool)
      • 120
        Latest cross-section measurements from T2K with the ND280 detector

        The T2K experiment's primary off-axis near detector, ND280, has the essential role of constraining the main systematic uncertainties that affect neutrino oscillation measurements. Among the leading sources of these uncertainties are neutrino-nucleon interaction cross sections, which must be more precisely understood to fully exploit the potential of current and future long-baseline neutrino experiments. ND280 is a multi-layered magnetised tracking detector with a variety of different target nuclei; it is capable of making precise measurements of cross-section topologies which form the main signal and background channels in T2K's oscillation analysis and is well suited for studying rare interaction channels relevant to the electron neutrino appearance signal. The cross-section measurements obtained at ND280 directly inform the theoretical models of neutrino interactions, helping to refine our understanding of this field and enabling more accurate determinations of oscillation parameters. This first part of this talk will show several novel cross-section results from T2K, including new measurements in muon neutrino charged current interactions without pions and world-first measurements of neutral-current single pion production and electron neutrino charged-current pion production on carbon.

        The second part of this talk will focus on the recent upgrade to ND280 to include a new suite of sub-detectors: a high granularity SuperFGD with 2 million optically-isolated scintillating cubes read out by wavelength shifting fibres and 55000 Multi-Pixel Photon Counters; two horizontal Time-Projection Chambers instrumented with resistive Micromegas, and additionally six panels of scintillating bars for precise time-of-flight measurements. These new detectors permit analyses with lower tracking thresholds, 4pi angular acceptance and the measurement of kinematics of neutrons produced in neutrino interactions. Developments of analyses using the upgraded ND280 detector configuration will be discussed, highlighting significant performance improvements.

        Speaker: Katharina Lachner (ETH Zurich (CH))
        NuFact25_t2k_xsec_results_04_09_2025_vfin.pdf
      • 121
        Enabling the Multi-Detector Approach at JPARC: First Measurements and Future Prospects with Wagasci-BabyMIND and NINJA

        The T2K experiment has operated for over a decade using the on-axis near detector INGRID and ND280 as the primary near detector for oscillation and neutrino interaction physics at 2.5 degrees off-axis, both located at JPARC. Recent upgrades to T2K include an increased power at JPARC's neutrino beamline, detector upgrades to ND280, and the installation of a second near detector, Wagasci-BabyMIND, situated at 1.5 degrees off-axis, situated underneath ND280. Wagasci-BabyMIND features both full plastic and hybrid plastic/water targets and is exposed at a different neutrino energy spectra, complementing ND280 capabilities. Additionally, it hosts the NINJA target, a water-based emulsion detector operated by the NINJA collaboration, capable of studying neutrino interactions in water with exceptionally low tracking thresholds. This presentation will showcase the first cross-section measurement from T2K using the Wagasci-BabyMIND detector and explore the enhanced physics reach and opportunities enabled by Wagasci-BabyMIND and the recently established T2K-NINJA cross-collaboration effort. Combined with INGRID and ND280, these new detectors enable a diverse and rich multi-detector approach to study neutrino physics at JPARC.

        Speaker: Dr César Jesús-Valls (CERN)
        NuFact2025_CJV.pdf
      • 122
        Preliminary results from the first NINJA physics run

        We present preliminary measurements on $\nu_\mu$ charged-current interactions on water, obtained from the first physics run of the NINJA experiment. The interactions were recorded using nuclear emulsion detectors with a 75 kg water target exposed to a J-PARC $\nu_\mu$ beam of mean energy 0.86 GeV and a total exposure of $4.8\times10^{20}$ protons on target. The sub-micrometer spatial resolution of the emulsion detectors enables exceptionally low momentum thresholds — 200 MeV/c for protons and 50 MeV/c for pions.
        The results include final-state muon, proton, and pion multiplicities and kinematic distributions, based on 70% of the fiducial volume, restricted to the central region of the target with minimal background contamination. We also discuss the potential of the full NINJA dataset to provide valuable input for modeling GeV-scale neutrino–nucleus interactions, in support of current and next-generation long-baseline oscillation experiments.

        Speaker: Seungho Han
        ninja_nufact_2025_han_draft_v1.3.pdf
      • 123
        Nuclear Dependence in Antineutrino Scattering in Focus: Insights from MINERvA

        Understanding both neutrino and antineutrino interactions in the few-GeV regime is necessary for precision measurements of neutrino oscillations. In particular, it is crucial to study the nuclear effects that can alter final-state topology and kinematics, potentially biasing neutrino energy reconstruction. MINERvA is a high-statistics cross-section experiment designed to study such nuclear effects in order to provide constraints on the underlying physics and support the advancement of neutrino interaction modelling.

        This talk presents a comprehensive overview of MINERvA’s antineutrino analyses across a broad range of nuclear targets, including carbon, hydrocarbon, iron, and lead. Particular focus is given to new cross-section measurements of inclusive charged-current antineutrino scattering at a peak energy of approximately 6 GeV, covering a wide range of kinematic regimes and enabling the study of transitions between them. Within this context, an analysis of an exclusive CCQE-like subsample is presented, emphasising MINERvA’s ability to detect and analyse neutron production. Results from the shallow-inelastic scattering regime are also included, along with ongoing progress in deep-inelastic scattering analyses. These measurements provide important constraints on nuclear effects and contribute to a more complete understanding of antineutrino interactions.

        Speaker: Anezka Klustova
        2025-09-04-nufactMINERvA.pdf
    • WG3 Space 9 (The Spine, Liverpool)

      Space 9

      The Spine, Liverpool
      Convener: Eric Baussan
      • 124
        Remote maintenance of the neutrino beamline at J-PARC in the megawatt beam power era

        A high-intensity 30 GeV proton beam produced by the J-PARC Main Ring (MR) accelerator is used to generate one of the world’s most intense conventional neutrino beams, which plays a central role in J-PARC’s long-baseline neutrino program. This beam supports the ongoing T2K experiment and will provide accelerator neutrinos to the forthcoming Hyper-Kamiokande experiment, currently under construction. To meet the demands of these experiments, upgrades to the accelerator and its associated infrastructure are in progress, targeting stable operation at an average beam power of up to 1.3 MW in the near future. Operation at this power level will result in substantial irradiation of the beam monitors and beamline components directly upstream of the neutrino production target, making standard hands-on maintenance in that area of the beamline impossible. In this talk, I will present an overview of the planned upgrades to the J-PARC primary proton beamline, which will enable remote maintenance and replacement of certain irradiated components without requiring extended cooldown periods. This remote maintenance approach is expected to reduce equipment-related downtime and limit radiation exposure to personnel.

        Speaker: Piotr Podlaski (KEK High Energy Accelerator Research Organization (JP))
        NuFact_PP.pdf
      • 125
        Evaluating T2K Beam and Beamline Component Alignment with Beam Based Alignment using the Muon Monitor

        T2K is a long baseline off-axis neutrino experiment located in Japan with the goal of precisely measuring neutrino oscillations. To maintain stable beam operation, a muon monitor (MUMON) is used to indirectly measure the neutrino beam direction and intensity via the coincident muons. Ongoing work continues at J-PARC to prepare the beamline for higher intensity beam operation up to a planned 1.3 MW proton beam.
        As J-PARC continues to upgrade its beam intensity it is imperative to understand component alignment during beam operation to ensure safe operation with an accurate neutrino beam. As the first detector after the target with a baseline of 118 m, the muon monitor is sensitive to small changes in the proton beam direction as well as alignment of the collimator, target, and focusing horns. Machine learning models have been trained on Mumon data to predict primary proton beam parameters. To measure misalignments, proton beam position and angle scan data were cross checked with Monte Carlo simulations to find possible misalignments.

        Speaker: Ian Heitkamp
        Final - NUFACT - Muon Monitor Slides - Ian H.pdf
        Final - NUFACT - Muon Monitor Slides - Ian H.pptx
      • 126
        Target studies for the International Muon Collider Collaboration

        The International Muon Collider Collaboration (IMCC) is studying a multi-TeV muon collider. One of the most challenging aspects is the MW-class production Target, which must withstand nanosecond-scale and high-intensity proton bunches, while delivering optimal pion-muon yields from the start of the frontend. In addition to the high thermal shock and average power, resistance to fatigue and irradiation damage must be addressed. The influence of the capture solenoid field and stringent space constraints are also to be considered. This talk presents an overview of the Muon Collider frontend layout, key specifications and challenges, and the three Target technology options currently under study.

        Speaker: Rui Franqueira Ximenes (CERN)
        2025_09_04_NuFact25_Target studies IMCC
        2025_09_04_NuFact25_Target studies IMCC.pdf
        2025_09_04_NuFact25_Target studies IMCC.pptx
    • WG4 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Ljiljana Morvaj (Paul Scherrer Institute (CH))
      • 127
        Search for LFV and LFUV in Heavy Hadron Decays at CMS

        Tests of lepton flavor conservation and universality offer a sensitive probe for physics beyond the Standard Model (SM), with several BSM scenarios predicting deviations accessible at the CMS experiment. This contribution presents an overview of CMS results from searches for Lepton Flavor Violation (LFV) and Lepton Flavor Universality (LFU) violation in proton-proton collisions at a center-of-mass energy of 13 TeV, with a focus on heavy flavor decays. The results include a search for LFV in the charged sector via the $\tau \to 3\mu$ decay, as well as tests of LFU in the $B \to K\ell\ell$ and $B_c \to J/\psi,\ell\nu$ channels.

        Speaker: Felice Nenna (Universita e INFN, Bari (IT))
        LF(U)V_NuFact2025_def2.pdf
      • 128
        Search for rare processes and lepton-flavour violating decays of Higgs boson at the ATLAS experiment

        The Standard Model predicts several rare Higgs boson processes, including decays into a Z boson and a photon, a low-mass lepton pair and a photon, or a meson and a photon. Observing these rare decays would offer new and complementary insights into the Higgs boson's coupling structure beyond the more commonly studied channels. In addition, searches for lepton-flavor-violating decays of the Higgs boson are performed, where any observation would provide unambiguous evidence of physics beyond the Standard Model. This talk presents several recent results from the ATLAS experiment based on proton-proton collision data collected in Run2 at sqrt(s) = 13 TeV, with the inclusion of available Run 3 results where relevant

        Speaker: Dr Ligang Xia (Nanjing University (CN))
        NuFact2025_LigangXia.pdf
    • WG6 Space 8 (The Spine, Liverpool)

      Space 8

      The Spine, Liverpool
      Convener: Dr Akira Takenaka (Shanghai Jiao Tong University, Tsung-Dao Lee Institute)
      • 129
        The Super Fine-Grained Detector for the T2K long-baseline neutrino experiment

        The Tokai-to-Kamiokande (T2K) experiment is a long-baseline neutrino experiment based in Japan. T2K obtained results that disfavour CP conservation with a 90% confidence level so far. The (anti)neutrino beam created at J-PARC is characterised at the near detector before measuring the oscillated spectrum using the Super-Kamiokande detector 296 km away. Toward more precise measurements of neutrino oscillations, T2K started operation of the fully upgraded near detector in 2024 to further reeduce major systematic uncertainties on neutrino-nucleus interactions. The upstream part of the near detector ND280 was replaced with three new detectors: the Super Fine-Grained Detector (SuperFGD), two High-Angle Time Projection Chambers (HATs), and six Time of Flight detectors (ToF). The SuperFGD is a target tracker which consists of about two million 1 cm3 plastic scintillator cubes packed in an approximate 2 m x 2 m x 0.6 m configuration. Scintillation light from the cubes is read out by around 56,000 channels from three directions through wavelength-shifting fibres and photosensors. It provides 3D track reconstruction, 4pi angular acceptance, calorimetry, and detection capability of neutrons and low momentum protons. We report the SuperFGD design, construction, operation status and detector performance.

        Speaker: Davide Sgalaberna (ETH Zurich (CH))
        SuperFGD.pdf
      • 130
        Time-of-Flight Detector Commissioning and Prospects for Physics in T2K

        Precision measurements of neutrino oscillation parameters in the Tokai to Kamioka (T2K) long-baseline neutrino experiment require a robust and accurate understanding of neutrino–nucleus interactions. The T2K near detector complex, ND280, is specifically designed to constrain neutrino flux parameters and cross-section models through detailed analyses of neutrino interactions. As part of the T2K-II phase, the ND280 complex has been upgraded to significantly enhance its performance through the addition of three advanced sub-detectors: a Super Fine-Grained Detector (SFGD), two High-Angle Time Projection Chambers (HA-TPCs), and six high-resolution Time-of-Flight (TOF) modules. The combination of these systems provides nearly 4π angular acceptance for charged particles, while the finer granularity lowers the proton momentum detection threshold to 300 MeV/c and facilitates neutron identification. As of June 2024, the new sub-detectors have been installed and are actively taking data.

        This talk presents the first analyses using data from the newly installed TOF detector. The TOF currently achieves a measured timing resolution of approximately 180 picoseconds, supporting both precise particle identification and the rejection of interactions originating outside the fiducial volume. The performance of the TOF has been evaluated through detailed studies of the time resolution, signal efficiency, and geometrical alignment, all of which indicate strong detector capability with further improvements expected from ongoing calibration efforts. Inter-detector calibration and track-matching studies with other ND280 sub-detectors further illustrate the system's robustness for high-precision neutrino interaction measurements. Finally, the talk will outline the potential benefits of using TOF information to support and improve current and future analyses.

        Speaker: Soniya Samani (Universite de Geneve (CH))
        nufact_2025_tof_samani_v2.pdf
      • 131
        ND280++, the multi-ton upgrade of the magnetised near detector for the Hyper-Kamiokande high-statistics phase

        Hyper-Kamiokande will start collecting accelerator neutrino data in 2028 to search for leptonic CP violation. The largest systematic uncertainty, $\Delta (\sigma_{{\nu}_e}/\sigma_{\bar{\nu}_e})$, is related to the ratio between the electron neutrino and antineutrino cross section. A not proper modeling could generate an ambiguous asymmetry in the ratio between the $\nu_{\mu} \to \nu_e$ and $\bar{\nu}_{\mu} \to \bar{\nu}_e$ oscillation probabilities, thus leading to a bias in the measurement of the CP violating phase ($\delta_{CP}$). Sensitivity studies show that the magnetised near detector (ND280) currently operating at the T2K experiment, and the intermediate water-Cherenkov detector (IWCD), together, constrain $\Delta (\sigma_{{\nu}_e}/\sigma_{\bar{\nu}_e})$ to about 4\%. Its reduction would lead to an improvement in the sensitivity down to $\delta_{CP} \sim 45^{\circ}$. Thus, Hyper-Kamiokande is developing the conceptual design of a second upgrade of ND280, called ND280++, envisaged for the high-statistics phase, after 2030, when the systematic uncertainty will become dominant. The detectors operating since the start of T2K in 2009, would be replaced with up to 10 tons of water and/or organic scintillator detectors and time projection chambers, aiming to a three times higher neutrino target mass and a large water content. The main goals of ND280++ are the collection of a high-statistics sample of $\nu_e$ and $\bar{\nu}_{e}$ interactions, the precision measurement of the neutrino cross section in water, the high-resolution reconstruction of the hadronic final state, down to below 200 MeV/c proton momenta. The ND280++ reference design will be presented and the status of the ongoing R&D, ranging from scintillating fibers, 3D segmented water-based liquid scintillator to highly segmented organic scintillator, will be reported. Finally, the results of the ongoing simulation studies of the ND280++ physics potential will be discussed.

        Speaker: Davide Sgalaberna (ETH Zurich (CH))
        ND280plusplus.pdf
      • 132
        The ANNIE Experiment: Overview and Status

        The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton gadolinium loaded water Cherenkov detector installed on the Booster Neutrino Beam (BNB) line at Fermilab. ANNIE physics goals include measuring the neutron multiplicity in neutrino-nucleus interactions and the charged current cross-section of muon neutrino interactions with water. In addition, ANNIE serves as a platform for the development and testing of new detector technologies. The first of these technologies is the Large Area Picosecond Photodetector (LAPPD), a light detector with an outstanding time resolution that can enhance the reconstruction of neutrino interactions. The second technology is the Water-based Liquid Scintillator (WbLS), which is a target material that is capable of producing Cherenkov and scintillation light simultaneously, allowing for better energy resolution and particle identification. In this talk, I will provide an overview of the ANNIE experiment, its recent developments in LAPPD data reconstruction, and the analysis of the most recent neutrino beam data.

        Speaker: Luis Mora-Lepin (Florida State University)
        ANNIE_NuFact2025.pdf
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • WG2 Space 4 & 5 (The Spine, Liverpool)

      Space 4 & 5

      The Spine, Liverpool
      Convener: Dr Sam Jenkins (University of Liverpool)
      • 133
        Electron-induced single-pion production to extract the neutron spectral function of argon 40.

        Liquid argon serves as detector material in several present and future accelerator-based neutrino experiments, such as MicroBooNE, SBND, ICARUS [1] and DUNE [2].

        Therefor, precise information about the structure of the target nucleus—that is, the binding energies and momentum distributions of the nucleons—is crucial for accurate modeling of neutrino–nucleus cross sections. This is especially important if the goal is to predict the correct energy balance of the reaction and thereby minimize systematic errors in the reconstruction of the neutrino energy.

        In this communication, we discuss possible experimental setups that could help shed light on the structure of protons and neutrons in argon-40. The simulations are based on the capabilities of the MAMI (Mainz, Germany) [3] and CLAS (JLab, USA) [4] facilities.

        [1] M. Antonello et al. (LAr1-ND, ICARUS-WA104, MicroBooNE), (2015)
        [2] R. Acciarri et al. (DUNE), (2016), arXiv:1601.05471
        [3] Nucl.Instrum.Meth.A 403 (1998) 263-301, https://wwwa1.kph.uni-mainz.de/optical-properties-of-the-a1-spectrometers/
        [4] Nucl.Instrum.Meth.A 503 (2003) 513-553, https://www.jlab.org/physics/hall-b/clas

        Speaker: Javier Garcia Marcos
        NuFact25_JGarciaMarcos_040925.pdf
      • 134
        Short-Range Correlations and Meson-Exchage Currents in neutrino and electron scattering

        We compute the contribution of meson-exchange currents (MEC) to the one-particle
        emission transverse response of nuclear matter, including short-range correlations (SRC)
        within the independent pair approximation. Our results show a significant enhancement
        of the transverse response in electron scattering, in contrast to independent-particle
        models that neglect SRC [1]. SRC are incorporated by solving the Bethe-Goldstone
        (BG) equation in the nuclear medium [2] using the Granada-2013 NN potential. This
        realistic interaction, fitted to the world database of NN scattering [3], allows the BG
        equation to be reduced to a system of linear equations, which can be solved exactly.
        The nucleon-pair wave function acquires high-momentum components, as Pauli block-
        ing prevents low-momentum scattering in the nuclear medium. In one-particle emis-
        sion reactions, the MEC 1p1h matrix element interferes with the one-body current
        contribution, modifying the response function. When the MEC operator acts on the
        high-momentum components of the correlated wave function, it generates an addi-
        tional contribution that enhances the response beyond the uncorrelated Fermi gas. This
        enhancement is consistent with Fabrocini’s results [4], within correlated basis function
        perturbation theory and provides a step toward explaining experimental data on the
        transverse response.
        We extend the formalism to the weak sector relevant for quasielastic neutrino scat-
        tering, which is of particular interest in neutrino oscillation experiments. The MEC–one-
        body interference response in nuclear matter includes a contribution from the pure
        Fermi gas and another from the coupling to high-momentum components generated by
        short-range correlations between nucleon pairs. These results are presented here for the
        first time in the case of neutrino-induced reactions where the differents contributions
        to the response functions are analyzed in detailed for different kinematics.

        [1] P. R. Casale, J. E. Amaro, V. Belocchi, M. B. Barbaro, A. De Pace and M. Martini,
        [arXiv:2503.08391 [nucl-th]].

        [2] P. R. Casale, J. E. Amaro, E. Ruiz Arriola and I. Ruiz Simo, Phys. Rev. C 108,
        no.5, 054001 (2023)

        [3] R. Navarro Pérez, J. E. Amaro and E. Ruiz Arriola, Phys. Rev. C 88, no.6, 064002
        (2013) [erratum: Phys. Rev. C 91, no.2, 029901 (2015)]

        [4] Adelchi Fabrocini, Phys. Rev. C 55 (1997) 338.

        Speaker: paloma Rodriguez Casale (Universidad de Granada)
        liver.pdf
      • 135
        Global Extraction of the C-12, Ca-40, and Fe-56 Nuclear Electromagnetic Response Functions and Comparisons to Nuclear Theory and Neutrino/Electron Monte Carlo Generators

        We report on global extractions of the $\rm^{12}C$, $\rm^{40}Ca$ and $\rm^{56}Fe$ longitudinal (${\cal R}_L$) and transverse (${\cal R}_T$) nuclear electromagnetic response functions from an analysis of all available electron scattering and photoprodution data on these nuclei. The response functions are extracted for energy transfer $\nu$, spanning the nuclear excitation, quasielastic (QE) scattering with one nucleon (1p1h) and two nucleon (2p2h) final states, and the resonance and inelastic continuum. We extract ${\cal R}_L$ and ${\cal R}_T$ as functions of $\nu$ for both fixed values of $Q^2$ and also for fixed values of 3-momentum transfer $\bf q$. Given the nuclear physics common to both electron and neutrino scattering from nuclei, extracted response functions from electron scattering spanning a large range of $Q^2$ and $\nu$ also provide a powerful tool for validation and tuning of neutrino Monte Carlo (MC) generators. In this paper we present comparisons of our previous measurements of $\rm^{12}C$ and new measurements of $\rm^{40}Ca$ and $\rm^{56}Fe$ nuclear response functions to the predictions of the ``Energy Dependent-Relativistic Mean Field'' (ED-RMF) calculation, and the predictions of an improved superscaling model (SuSAv2) over the entire kinematic range.

        Speaker: Arie Bodek (University of Rochester (US))
      • 136
        Optimizing the description of the delta region in the Ghent Hybrid model for pion production

        Single-pion production provides an important contribution to the total neutrino-nucleus interaction cross section in neutrino oscillation experiments. This contribution improves the Ghent Hybrid model in the delta-resonance region. The philosophy of this work is to incorporate as much physics constraints as possible while keeping the amount of fitted parameters as low as possible. The model is formulated in a multipole expansion framework allowing the use of K matrix theory to unitarize the background contributions. Further, the ρ and ω exchange diagrams are added to the model. Watson’s theorem is implemented by adapting both the background and ∆(1232) contributions. The decay width and form factors of the delta contribution are modified to comply with Watson’s theorem. These adjustments are compared with other pion-production models available as well as with CLAS pion electroproduction data. The results show considerable improvement in the description of the delta-peak region.

        Speaker: Matthias Hooft (Ghent university)
        talk_Matthias_NUFACT_2025.pdf
      • 137
        The Axial Form Factor Extracted from Elementary Targets

        The Axial Form Factor Extracted from Elementary Targets"
        Abstract: Next generation neutrino oscillation experiments are poised to provide answers to key questions about the nature of the neutrino. The nucleon axial form factor is a vital ingredient for constructing nucleon amplitudes and predicting quasielastic scattering cross sections, a primary measurement process for flagship oscillation experiments. The uncertainty on this form factor has been historically underestimated and a model independent determination is not well constrained by elementary target data. To fulfill this experimental need, first principles Lattice QCD computations yield the interaction of a nucleon with a weak current in the absence of a nuclear medium. Results from LQCD calculations will significantly improve constraints on the form factor and permit factorization of uncertainties originating from nucleon and nuclear sources. In this talk, I will discuss the application of deuterium scattering and preliminary results from hydrogen scattering and LQCD calculations for extracting the axial form factor and its uncertainty. I will examine some of the discrepancies between extractions and outline a path toward improving the form factor uncertainty for next-generation neutrino experiments.

        Speaker: Aaron Meyer
        nufact-2.pdf
    • WG1 Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: yun tse tsai (SLAC)
      • 138
        Status and plans for T2K neutrino oscillation analyses

        T2K is a long-baseline neutrino oscillation experiment, measuring the oscillation of neutrinos and antineutrinos produced at J-PARC facility which then travel 295 km across Japan to its far detector, Super Kamiokande. T2K has been taking data since 2009 and sets world-leading constraints on many neutrino oscillation parameters within the standard PMNS three-flavour mixing paradigm, including offering hints that the CP-violating phase favours non CP-conserving values. In this talk, T2K's latest analysis of neutrino oscillations will be presented. This analysis includes the presence of new and improved event samples at the near and far detectors as well as a significant update to the treatment of systematic uncertainties on neutrino interactions as well as the near detector and far detector responses. Additional electron-neutrino appearance candidates have also been added into the analysis. The latest oscillation parameter constraints will be presented as well as the near future plans of the experiment including the upgraded near detector and the increased current in the focusing horns for the neutrino beam.

        Speaker: Prof. Helen O'Keeffe (Lancaster University)
        NuFact2025_OKEEFFE_04092025.pdf
      • 139
        Future sensitivity of the T2K experiment with its upgraded neutrino beam and optimisation of neutrino/antineutrino running modes

        T2K is a long-baseline neutrino oscillation experiment located in Japan. Its aim is to undertake precise measurements of the atmospheric parameters |dm2_23|, sin2theta23 and to search for CP-violation within the leptonic sector, which would manifest as a discrepancy between neutrino and anti-neutrino oscillations. Thanks to its focussing horns, the T2K experiment has the faculty to produce low-background fluxes in neutrino and anti-neutrino modes, separately. The complementary use of these two modes is crucial to help break degeneracies between oscillation parameters, notably in the search for CP-violation. Hence, the ratio between neutrino and antineutrino beam modes has to be tuned on the basis of the physics goals of the experiment. We conducted a new sensitivity study to address this question, in particular taking into account the effects of the recent upgrade of the focalising horn current, increased from 250kA to 320kA. The study implements a novel algebraic method in order to estimate the constraining power of future near detector data as a function of statistics. The sensitivity is estimated for all the oscillation parameters accessible at T2K and considering different possible values of such parameters. In some cases, the objective of reaching a 3 sigma evidence of CP-violation proves to be promisingly close. The detailed study of the degeneracies between the different oscillation parameters paves the way for the next high-statistics era of long-baseline experiments. While the impact of the ND constraints is quantified in a simplistic way in these studies, the importance of the new capabilities of the upgrade of the ND280 detector in reducing systematics uncertainties will be discussed, opening the door for further analysis improvements.

        Speaker: Pierre Boistier (CEA Paris-Saclay, Université Paris-Saclay (FR))
        20250904_boistier_nufact.pdf
      • 140
        Oscillation physics with reactor antineutrinos in JUNO

        The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment in South China currently in its commissioning phase. Situated under 650 meters of rock overburden ($\sim$1800 meters water equivalent), JUNO’s central detector consists of a 20-kton liquid scintillator target housed in a 35.4-meter-diameter acrylic sphere. It achieves remarkable 75% photocathode coverage thanks to a hybrid system of 17,612 large (20-inch) and 25,600 small (3-inch) photomultiplier tubes (PMTs). This high coverage is crucial for reaching its target and unparalleled energy resolution of 3% at 1 MeV.
        JUNO’s primary objective is to determine the neutrino mass ordering (NMO) using reactor antineutrinos from two nuclear power plants located 52.5 km from the detector. This baseline places JUNO at the first solar oscillation maximum (where $\Delta_{21} \simeq \frac{\pi}{2}$), enabling simultaneous sensitivity to both solar-scale ($\Delta m_{21}^{2}$) and atmospheric-scale ($\Delta m_{31}^{2}$) oscillations. Notably, JUNO is the first experiment capable of probing the NMO in the vacuum-dominated regime, thanks to the interference between two oscillation terms and without relying on matter-induced effects.
        JUNO also aims for sub-percent precision on $\Delta m_{31}^{2}$, $\Delta m_{21}^{2}$, and $\sin^2\theta_{12}$, surpassing current measurements by an order of magnitude. These high-precision measurements will play a central role in the global landscape of neutrino oscillations, enabling synergies with experiments using accelerator and atmospheric neutrinos.
        This contribution will focus on JUNO’s potential in neutrino oscillation physics using reactor antineutrinos and how it will play a key role in both the precision and discovery frontiers.

        Speaker: Vanessa Cerrone (University of Padova / INFN Padova)
        nufact2025_cerrone.pdf
    • WG4+WG6 Space 7 (The Spine, Liverpool)

      Space 7

      The Spine, Liverpool
      Convener: Mikio Sakurai (UCL)
      • 141
        A high efficiency cosmic ray muon detector for the Mu2e experiment

        The Mu2e experiment at Fermilab will conduct a world-leading search for Charged Lepton Flavour Violation (CLFV) in neutrino-less muon-to-electron conversion in the field of a nucleus. In doing so, it will provide a powerful probe into physics beyond the Standard Model, which can greatly enhance the rates of CLFV processes. To accomplish this measurement, which will constitute an $\mathcal{O}(10^{4})$ improvement in sensitivity as compared to previous experiments, Mu2e must have excellent control over potential backgrounds: requiring less than one background event for $\mathcal{O}(10^{18})$ muons stopped over the lifetime of the experiment. One such background arises from cosmic muons, which are expected to induce approximately one background event per day. Mu2e will suppress these cosmic ray background events with an active shielding system: a large-area cosmic ray veto (CRV) detector enclosing the apparatus, with the ability to identify and veto cosmic ray muons with an average efficiency of 99.99%. This talk will describe the design of the CRV, its expected performance, and its present status in preparation for commissioning and data-taking.

        Speaker: Samuel Grant (ARGONNE NATIONAL LABORATORY)
        NUFACT2025-SGRANT.pdf
      • 142
        Storing muons in a compact frozen-spin trap to search for an electric dipole moment

        A dedicated search for the muon electric dipole moment using the frozen-spin technique [1] promises to extend our reach towards physics beyond the Standard Model incorporating additional sources of CP violation. The muEDM Collaboration is developing a compact frozen-spin trap [2] to enable a first demonstration of this technique, with a target sensitivity of $6\times10^{-23}\,e\mathrm{cm}$, more than a factor of 1000 beyond the current limit [3]. Polarized muons of $28\,\mathrm{MeV}/c$ from a high intensity muon beamline at the Paul Scherrer Institute will be injected off-axis into a $3\,\mathrm{T}$ superconducting solenoid and stored at its centre with an orbital radius of $30\,\mathrm{mm}$. A fast kicker magnet will reduce axial momentum and permit confinement within a weakly-focusing magnetic field.
        The hallmark of the frozen-spin technique is the cancellation of the spin precession induced by the anomalous magnetic moment ($g-2$) by precisely tuning a radial electric field. This enhances sensitivity by permitting only the precession out of the orbital plane as would arise due to a non-zero EDM. The parity-violating muon decay allows spin-tracking of an ensemble by reconstructing trajectories of emitted positrons using an array of scintillating fibres. With systematic effects controlled [4], an EDM would be apparent from the measured rate of change in asymmetry of positron emitted up- and downstream of the orbital plane. This talk will outline the developments undertaken by the Collaboration and preparations for the upcoming demonstration of core systems. In particular, the efforts in developing a fast kicker magnet and optimisation of the storage dynamics will be presented.

        [1] F.J.M. Farley et al., Phys. Rev. Lett. 93, 052001 (2004).
        [2] A. Adelmann et al., Eur. Phys. J. C 85, 622 (2025).
        [3] G.W. Bennett et al., Phys. Rev. D 80, 052008 (2009).
        [4] G. Cavoto et al., Eur. Phys. J. C 84, 262 (2024).

        Speaker: Timothy Hume (Paul Scherrer Institute)
        NuFact2025_THume_muEDM_build.pdf
    • Banquet Arrival

      Arrival period for the banquet, drinks available.

    • Banquet The Hilton, Liverpool

      The Hilton, Liverpool

      The conference banquet

  • Friday 5 September
  • Saturday 6 September
    • Summaries Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Coffee Break The Spine, Liverpool

      The Spine, Liverpool
    • Summaries Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
    • Closing Main Auditorium (The Spine, Liverpool)

      Main Auditorium

      The Spine, Liverpool
      Convener: Neil McCauley (The University of Liverpool)
      nufact 2026 closing.pdf
    • Lunch Break The Spine, Liverpool

      The Spine, Liverpool
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