Q1 publikacija: Kinematic constraint on the residue phase in elastic resonances

Članovi našeg odsjeka su koautori novog naučnog rada u prestižnom časopisu Physics Letter B pod nazivom Kinematic constraint on the residue phase in elastic resonances. Physics Letters B je jedan od najprestižnijih naučnih časopisa u svijetu fizike sa fokusom na brzu objavu značajnih novih rezultata u specifičnim oblastima fundamentalne fizike. Časopis pokriva nekoliko oblasti fizike (fizika elementarnih čestica, nuklearna fizika, kosmologija i astrofizika) i nalazi se u 25% najuticajnijih časopisa u svojoj disciplini u svijetu (Q1).

S. Ceci, R. Omerović, H. Osmanović, M. Uroić, M. Vukšić, B. Zauner, Kinematic constraint on the residue phase in elastic resonances, Physics Letters B, Volume 881, 2026, 140892, ISSN 0370-2693,
https://doi.org/10.1016/j.physletb.2026.140892.
(https://www.sciencedirect.com/science/article/pii/S0370269326007434)

Abstract

We show that the complex-plane structure of light hadron resonances is governed by a unified kinematic framework where the threshold position plays a decisive role. By applying this framework to ππ, πK, and πN phase shifts, we show that the residue phase θ is primarily determined by the threshold-locked phase δ₀ (the angle between pole and real axis seen from the threshold). While vector resonances exhibit excellent alignment with this kinematic baseline, scalar resonances show systematic deviations of 10^∘–15^∘, which we identify as the uncompensated residual of subthreshold chiral dynamics.

Keywords

Light non-strange mesons;  Light strange mesons;  Nucleon resonances; Analytic properties of S matrix