The $d^{\ast }$(2380) dibaryon resonance width and decay branching ratios

Abstract

Attempts to reproduce theoretically the relatively small width, ${\Gamma }_{d^{\ast }}=80\pm 10$ MeV, of the $I(J^P)=0(3^{+})$ $d^{\ast }$(2380) dibaryon resonance established by the WASA-at-COSY Collaboration are discussed. The validity of associating the $d^{\ast }$(2380) in quark-based models primarily with a tightly bound $\Delta \Delta$ configuration is questioned. The $d^{\ast }$(2380) width and decay branching ratios into $NN\pi \pi$, $NN\pi$ and $NN$ final states are studied within the Gal-Garcilazo hadronic model in which the $d^{\ast }$(2380) is a $\pi N\Delta$ resonance embedded in the $NN\pi \pi$ continuum some 80 MeV below the $\Delta \Delta$ threshold. In particular, predictions are made for the branching ratios of the unobserved yet $d^{\ast }(2380)\to NN\pi$ decays which are suppressed in a purely-$\Delta \Delta$ dibaryon model. Comments are also made on a possible connection of the ABC effect observed in the $pn\to d^{\ast }\to d{\pi }^0{\pi }^0$ resonance reaction to the $d^{\ast }$(2380) dibaryon.

v1 -- 8 pages, 3 figures, 3 tables, submitted for publication; v2 -- one review section removed, 7 pages, 2 figures, 2 tables, Physics Letters B (in press)

References in corpus (11)

• ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?
• Updated analysis of NN elastic scattering to 3 GeV
• Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
• On the History of Dibaryons and their Final Observation
• Three-body model calculations of Nucleon-Delta and Delta-Delta dibaryon resonances
• Neutron-Proton Scattering in the Context of the $d^{\ast }$(2380) Resonance
• Decay width of $d^{\ast }(2380)\to NN\pi \pi$ processes
• Decay width of $d^{\ast }(2380)\to NN\pi$ process in a chiral constituent quark model
• On the width of N-Delta and Delta-Delta states
• Is $d^{\ast }$ a candidate of hexaquark-dominated exotic state?
• Isoscalar Single-Pion Production in the Region of Roper and $d^{\ast }(2380)$ Resonances

Cited by in corpus (17)

• Hadronic molecular assignment for the newly observed ${\Omega }^{\ast }$ state
• Scattering of decuplet baryons in chiral effective field theory
• The $d^{\ast }(2380)$ in neutron stars - a new degree of freedom?
• Dibaryons: Molecular versus Compact Hexaquarks
• An Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction?
• On the charge distribution of $d^{\ast }(2380)$
• On the form factors of $d^{\ast }(2380)$
• $\rho \rho$ scattering revisited with coupled-channels of pseudoscalar mesons
• Possible molecular states from the $N\Delta$ interaction
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Electromagnetic properties of the $d^{\ast }(2380)$ hexaquark
• Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{\ast }(2380)$ Dibaryon Resonance
• Resonance-like coherent production of a pion pair in the reaction $pd\to pd\pi \pi$ in the GeV region
• A diquark model for the d*(2380) dibaryon resonance?
• Isospin symmetry breaking in double-pion production in the region of $d^{\ast }(2380)$ and the scalar $\sigma$ meson
• Structure and Width of the d*(2380) Dibaryon
• Resonance $d^{\ast }(2380)$ and higher isospin states