Isospin-symmetry violation -- kaons and beyond (ISO-BREAK 25: summary and outlook)

Marek Gazdzicki (1); Francesco Giacosa (1); Katarzyna Grebieszkow (2); David Blaschke (3); Marcus Bleicher (4); Bastian Brandt (5); Wojciech Brylinski; Tobiasz Czopowicz (6); Jim Drachenberg (7); Dipangkar Dutta (8); Francesca Ercolessi (9); Mark Gorenstein (10); Linqin Huang (11); Oleksii Ivanytskyi (3); Nicolo Jacazio (12); Joseph Kapusta (13); Seweryn Kowalski (14); Maciej Piotr Lewicki (15); Manuel Lorenz (16); Stanislaw Mrowczynski (6); Vitalii Ozvenchuk (15); Oleksandra Panova (1); Roman Planeta (17); Krzysztof Piasecki (18); Milena Piotrowska (1); Rob Pisarski (19); Damian Pszczel (6); Johann Rafelski (20); Martin Rohrmoser (1); Andrzej Rybicki (15); Maciej Rybczynski (1); Radoslaw Ryblewski (15); Subhasis Samanta (21); Mayank Singh (22); Joanna Maria Stepaniak (6); Grzegorz Stefanek (1); Herbert Stroebele (4); Tatjana Susa (23); Leonardo Tinti (1); Ludwik Turko (3); Oleksandr Vitiuk (3); Klaus Werner (24); Hanna Zbroszczyk (2) ((1) Jan Kochanowski University; Kielce; Poland; (2) Warsaw University of Technology; Warsaw; Poland; (3) University of Wroclaw; Poland; (4) Goethe University; Frankfurt am Main; Germany; (5) University of Bielefeld; Germany; (6) National Centre for Nuclear Research; Warsaw; Poland; (7) Abilene Christian University; USA; (8) Mississippi State University; USA; (9) University INFN; Bologna; Italy; (10) Bogolyubov Institute for Theoretical Physics; Kyiv; Ukraine; (11) Institute of Modern Physics; Chinese Academy of Sciences; China; (12) University del Piemonte Orientale; Italy; (13) University of Minnesota; USA; (14) University of Silesia; Poland; (15) Institute of Nuclear Physics; Polish Academy of Sciences; Krakow; Poland; (16) GSI Helmholtzzentrum fur Schwerionenforschung; Darmstadt; Germany; (17) Jagiellonian University; Krakow; Poland; (18) University of Warsaw; Poland; (19) Brookhaven National Laboratory; USA; (20) University of Arizona; Tucson; USA; (21) Kalinga Institute of Industrial Technology; India; (22) Vanderbilt University; USA; (23) Rudjer Boskovic Institute; Zagreb; Croatia; (24) SUBATECH; Nantes University-IN2P3/CNRS-IMT Atlantique; Nantes; France)

arXiv:2604.16005·nucl-ex·April 20, 2026

Isospin-symmetry violation -- kaons and beyond (ISO-BREAK 25: summary and outlook)

Marek Gazdzicki (1), Francesco Giacosa (1), Katarzyna Grebieszkow (2), David Blaschke (3), Marcus Bleicher (4), Bastian Brandt (5), Wojciech Brylinski, Tobiasz Czopowicz (6), Jim Drachenberg (7), Dipangkar Dutta (8), Francesca Ercolessi (9), Mark Gorenstein (10)

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TL;DR

This report summarizes discussions on isospin-symmetry violation observed in various experiments, highlighting current findings, theoretical status, and future research priorities in understanding this unexplained phenomenon.

Contribution

It provides an overview of experimental and theoretical progress on isospin-symmetry breaking, emphasizing recent discoveries and outlining future research directions.

Findings

01

Isospin-symmetry violation confirmed by multiple experiments.

02

Current observations are not yet fully explained theoretically.

03

Priorities include further experimental verification and theoretical modeling.

Abstract

This report summarizes the presentations and discussions during the ISO-BREAK 25 Workshop ``Isospin symmetry violation: kaons and beyond'', which was held at Jan Kochanowski University in Kielce on October 23-25, 2025. We address the current status of the isospin-symmetry breaking discovered by NA61/SHINE in nucleus-nucleus collisions at the CERN SPS, its confirmation by other experiments and studies in \ee and deep inelastic scattering. In addition, we discuss the theoretical status as well as we outline experimental and theoretical priorities towards understanding this currently unexplained phenomenon.

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