Overview
We are pleased to announce that the next iteration of the Neutrino Mass Workshop (NuMass 2026), titled “Determination of the Absolute Electron (Anti-)Neutrino Mass”, will take place in Karlsruhe, Germany, from April 13–16, 2026.
The NuMass workshop series is dedicated to the direct determination of the neutrino mass and has established itself as a central forum for the exchange of ideas between experimentalists and theorists working in this field. NuMass 2026 continues this tradition by providing an international platform to discuss the latest experimental results, technological developments, and theoretical advances related to absolute neutrino mass measurements.
Directly following the NuMass 2026 workshop, a celebration symposium will be held in honor of the KATRIN experiment reaching its target of 1000 days of neutrino mass measurements, hosted at the Karlsruhe Institute of Technology (KIT), Campus North. This symposium will highlight the achievements of KATRIN and reflect on its impact on the global neutrino physics landscape. Every participant is invited to join. More information Here!
The KATRIN experiment, designed for the direct determination of the effective electron anti-neutrino mass, has recently achieved a sub-eV upper limit and has accumulated more than 1000 days of beta-scanning marking a major milestone in the field. At the same time, new direct neutrino mass experiments using tritium, such as Project 8, PTOLEMY, and QTNM, as well as experiments based on electron capture in Ho-163, including ECHo and HOLMES, are completing their research and development phases and reporting new experimental results and novel ideas.
The goal of this international workshop is to fully exploit the scientific potential of current and future direct neutrino mass experiments and to foster in-depth discussions of experimental techniques and theoretical interpretations in a synergistic environment.
Scientific Topics
The workshop will cover, but is not limited to, the following topics:
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Neutrino mass experimental overviews:
neutrinoless double beta decay, cosmology, neutrino oscillations, sterile neutrinos, and the cosmic neutrino background -
Direct neutrino mass measurements:
beta decay and electron capture (EC) end-point studies -
Experimental aspects:
detector technologies, read-out electronics, data acquisition systems -
Data analysis:
signal processing, statistical analysis, background studies, calibration methods, detector modeling -
Theory:
theoretical description of beta-decay and electron-capture spectra
Modus Operandi
NuMass 2026 is organized to maximize scientific exchange and cross-collaboration between different approaches to neutrino mass determination:
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Researchers from all neutrino mass–related fields are invited to participate.
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All participants are encouraged to contribute a poster, providing a broad overview of ongoing activities and recent results.
- All oral contributions are "on invitation only".
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Review talks will cover adjacent and complementary fields, such as cosmology, neutrinoless double-beta decay, and neutrino theory, to place direct neutrino mass measurements in a wider scientific context.
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Collaboration overview talks will be given, with one dedicated overview presentation for each major experimental collaboration.
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The workshop will feature focused topical sessions (e.g. data analysis, detector technology, R&D, and experimental strategy).
These sessions are organized by small, cross-collaboration working groups and consist of concerted contributions resulting in a joint presentation. Each presentation will introduce the topic, summarize recent developments across experiments, and serve as a basis for extended and structured discussion.
This format is designed to strengthen cooperation between experiments and to identify common challenges, synergies, and future directions in the quest for the absolute neutrino mass.
