Szczegóły publikacji
Opis bibliograficzny
Evidence of isospin-symmetry violation in high-energy collisions of atomic nuclei / F. Giacosa, [et al.], W. KUCEWICZ, [et al.], Ł. MIK, [et al.], K. WITEK, [et al.] // Nature Communications [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2041-1723. — 2025 — vol. 16 art. no. 2849, s. 1–15. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 12–14, Abstr. — Publikacja dostępna online od: 2025-03-23
Autorzy (154)
- AGHKucewicz Wojciech
- AGHMik Łukasz
- AGHWitek Kamil
- Gaździcki Marek
- Giacosa F.
Dane bibliometryczne
| ID BaDAP | 159293 |
|---|---|
| Data dodania do BaDAP | 2025-05-19 |
| Tekst źródłowy | URL |
| DOI | 10.1038/s41467-025-57234-6 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Nature Communications |
Abstract
Strong interactions preserve an approximate isospin symmetry between up (u) and down (d) quarks, part of the more general flavor symmetry. In the case of K meson production, if this isospin symmetry were exact, it would result in equal numbers of charged (K+ and K−) and neutral (K0 and K¯0) mesons produced in collisions of isospin-symmetric atomic nuclei. Here, we report results on the relative abundance of charged over neutral K meson production in argon and scandium nuclei collisions at a center-of-mass energy of 11.9 GeV per nucleon pair. We find that the production of K+ and K− mesons at mid-rapidity is (18.4 ± 6.1)% higher than that of the neutral K mesons. Although with large uncertainties, earlier data on nucleus-nucleus collisions in the collision center-of-mass energy range 2.6<sNN<200 GeV are consistent with the present result. Using well-established models for hadron production, we demonstrate that known isospin-symmetry breaking effects and the initial nuclei containing more neutrons than protons lead only to a small (few percent) deviation of the charged-to-neutral kaon ratio from unity at high energies. Thus, they cannot explain the measurements. The significance of the flavor-symmetry violation beyond the known effects is 4.7σ when the compilation of world data with uncertainties quoted by the experiments is used. New systematic, high-precision measurements and theoretical efforts are needed to establish the origin of the observed large isospin-symmetry breaking.
