双重重子分子中的新奇特介子和重子共振。

New Exotic Meson and Baryon Resonances from Doubly Heavy Hadronic Molecules.

机构信息

School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel.

Enrico Fermi Institute and Department of Physics, University of Chicago, 5620 S. Ellis Avenue, Chicago, Illinois 60637, USA.

出版信息

Phys Rev Lett. 2015 Sep 18;115(12):122001. doi: 10.1103/PhysRevLett.115.122001. Epub 2015 Sep 14.

DOI:10.1103/PhysRevLett.115.122001

PMID:26430989

Abstract

We predict several new exotic doubly heavy hadronic resonances, inferring from the observed exotic bottomoniumlike and charmoniumlike narrow states X(3872), Z_{b}(10610), Z_{b}(10650), Z_{c}(3900), and Z_{c}(4020/4025). We interpret the binding mechanism as mostly molecularlike isospin-exchange attraction between two heavy-light mesons in a relative S-wave state. We then generalize it to other systems containing two heavy hadrons which can couple through isospin exchange. The new predicted states include resonances in meson-meson, meson-baryon, baryon-baryon, and baryon-antibaryon channels. These include those giving rise to final states involving a heavy quark Q=c,b and antiquark Q[over ¯]^{'}=c[over ¯],b[over ¯], namely, DD[over ¯]^{}, D^{}D[over ¯]^{}, D^{}B^{}, B[over ¯]B^{}, B[over ¯]^{}B^{}, Σ_{c}D[over ¯]^{}, Σ_{c}B^{}, Σ_{b}D[over ¯]^{}, Σ_{b}B^{}, Σ_{c}Σ[over ¯]{c}, Σ{c}Λ[over ¯]{c}, Σ{c}Λ[over ¯]{b}, Σ{b}Σ[over ¯]{b}, Σ{b}Λ[over ¯]{b}, and Σ{b}Λ[over ¯]_{c}, as well as corresponding S-wave states giving rise to QQ^{'} or Q[over ¯]Q[over ¯]^{'}.

摘要

我们预测了几个新的奇异双重重子强子共振，从观察到的奇异底夸克类似态和粲夸克类似态 X(3872)、Z_{b}(10610)、Z_{b}(10650)、Z_{c}(3900) 和 Z_{c}(4020/4025) 推断得出。我们将其解释为主要是两个重轻介子在相对 S 波态下的分子型同位旋交换吸引力。然后，我们将其推广到其他包含两个重子的系统，这些系统可以通过同位旋交换耦合。新预测的状态包括介子-介子、介子-重子、重子-重子和重子-反重子通道中的共振。这些共振包括那些产生涉及重夸克 Q=c,b 和反夸克 Q[over ¯]^{'}=c[over ¯],b[over ¯]的末态的共振，即 DD[over ¯]^{}、D^{}D[over ¯]^{}、D^{}B^{}、B[over ¯]B^{}、B[over ¯]^{}B^{}、Σ_{c}D[over ¯]^{}、Σ_{c}B^{}、Σ_{b}D[over ¯]^{}、Σ_{b}B^{}、Σ_{c}Σ[over ¯]{c}、Σ{c}Λ[over ¯]{c}、Σ{c}Λ[over ¯]{b}、Σ{b}Σ[over ¯]{b}、Σ{b}Λ[over ¯]{b}和 Σ{b}Λ[over ¯]_{c}，以及相应的 S 波态，产生 QQ^{'} 或 Q[over ¯]Q[over ¯]^{'}。