Charge-conjugation asymmetry and molecular content: the \(D_{s0}^\ast(2317)^\pm\) in matter

• Published in: arXiv.org 2024-04
• Main Authors: Montesinos, Victor, Albaladejo, Miguel, Nieves, Juan, Tolos, Laura
• Format: Article
• Language: English
• Subjects: Asymmetry; Conjugation; Kaons
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2403.00451

We analyze the modifications that a dense nuclear medium induces in the \(D_{s0}^\ast(2317)^\pm\) and \(D_{s1}(2460)^\pm\). In the vacuum, we consider them as isoscalar \(D^{(*)}K\) and \(\overline{D}{}^{(*)}\overline{K}\) \(S\)-wave bound states, which are dynamically generated from effective interactions that lead to different Weinberg compositeness scenarios. Matter effects are incorporated through the two-meson loop functions, taking into account the self energies that the \(D^{(*)}\), \(\overline{D}{}^{(*)}\), \(K\), and \(\overline{K}\) develop when embedded in a nuclear medium. Although particle-antiparticle [\(D^{(\ast)}_{s0,s1}(2317,2460)^+\) versus \(D^{(\ast)}_{s0,s1}(2317,2460)^-\)] lineshapes are the same in vacuum, we find extremely different density patterns in matter. This charge-conjugation asymmetry mainly stems from the very different kaon and antikaon interaction with the nucleons of the dense medium. We show that the in-medium lineshapes found for these resonances strongly depend on their \(D^{(*)}K\)/\(\overline{D}{}^{(*)}\overline{K}\) molecular content, and discuss how this novel feature can be used to better determine/constrain the inner structure of these exotic states.