Spectroscopic Analysis of Singly Heavy Pentaquarks in the Symmetric 15-Plet Representation Using Phenomenological Models

TL;DR

This paper investigates the properties of singly heavy pentaquarks with symmetric flavor and spin configurations using phenomenological models, providing predictions for their mass spectra, magnetic moments, and decay channels to aid future experimental searches.

Contribution

It introduces a comprehensive analysis of symmetric 15-plet pentaquarks with heavy quarks using extended mass formulas and novel charge schemes, advancing theoretical understanding of their structure.

Findings

Mass spectra predictions for heavy pentaquarks

Magnetic moment calculations for charm and bottom configurations

Identification of potential decay channels for experimental detection

Abstract

We analyze the ground state pentaquark structures with a single heavy quark ($qqqq\Bar{Q}$) using various phenomenological models. The recent observations of singly heavy tetraquark structures at LHCb serve as a significant motivation for this investigation. We studied the symmetric 15-plet configuration of SU(3) flavor representation with the spin-parity assignment of $5/2^-$, representing the symmetric spin state for the pentaquark systems. We employed an extended Gursey-Radicati mass formula and an effective mass scheme to compute the mass spectra of pentaquark states. Additionally, the methodology of the screened charge scheme is introduced to calculate the magnetic moment assignments, specifically for configurations involving both charm and bottom quarks. We also proposed the potential production modes originating from the weak decay of heavy baryons. We identified the strong decay channels where pentaquark transitions into a light baryon and a heavy meson. Our analysis of mass spectra, magnetic moments, and possible strong decay channels helps us to explore the inner structure of pentaquarks and their underlying quark dynamics. This work not only augments the theoretical frameworks used to describe such systems but is also helpful for future experimental pursuits at facilities like LHCb, fostering further experimental validations and discoveries in heavy quark spectroscopy.