Magnetic moments of the hidden-charm pentaquark states

Abstract

The magnetic moment of a baryon state is an equally important dynamical observable as its mass, which encodes crucial information of its underlying structure. According to the different color-flavor structure, we have calculated the magnetic moments of the hidden-charm pentaquark states with the isospin (I, I 3 ) = ( + in the molecular model, the diquark-triquark model, and the diquark-diquark-antiquark model, respectively. Although a good description for the pentaquark mass spectrum and decay patterns has been obtained in all three models, different color-flavor structures lead to different magnetic moments, which can be used to pin down their inner structures and distinguish various models.

Hidden-bottom pentaquarks

“…the necessary basis combination in spin (χ σi J ), flavor (χ fj I ), and color (χ c k ) degreesof-freedom. The physical channels with color-singlet (labeled with the superindex 1) and hidden-color (labeled with the superindex 8) configurations are listed in the fourth and sixth columns.Tables ranging from III to VII summarize our findings about the possible existence of lowest-lying hiddenbottom pentaquarks with quantum numbers I(J P ) = ), respectively 3. In each…”

Hidden charm pentaquarks: mass spectrum, magnetic moments and photocouplings

“…In this section, we study the magnetic moments of the ground state pentaquark states with J P = 3/2 − discussed in the previous section. The magnetic moment is a crucial ingredient in calculation of J/ψ photoproduction cross sections which can provide an independent observation of the pentaquark states [20][21][22][23][24][25][26][27][28][29][30]. In Ref.…”

“…They have also been studied using diquark-diquark-antiquark interpolating currents combined with QCD sum rules [19]. There are several proposals to confirm their existence using near threshold J/ψ photoproduction [20][21][22][23][24][25][26][27][28][29][30], although such a measurement depends on the size of the electromagnetic coupling of the pentaquarks and the J/ψp branching ratio. Besides confirmation of the signals in a different channel, to establish them as undisputed pentaquarks it is needed to find the other members of the multiplet.…”

Exotic pentaquark states with the qqQQQ¯ configuration

“…The studies of more possible pentaquarks were also stimulated by the observation of P c states [69][70][71][72][73]. After the experimental confirmation of the doubly charmed baryon Ξ ++ cc [74,75], the multiquark states with two or more heavy quarks were studied in many works [69][70][71][72][73]76]. For example, two possible triple-charm molecular pentaquarks Ξ cc D 1 and Ξ cc D * 2 were considered in Ref.…”