About a Possible Nonstrange Cousin of the Theta+ Pentaquark

TL;DR

This paper explores the possibility of a nonstrange pentaquark state related to the Theta+ using a diquark-triquark model, estimating its mass to match recent experimental hints of a narrow pi N resonance.

Contribution

It introduces a diquark-triquark pentaquark model with non-standard color configurations and provides a mass estimate aligning with experimental observations.

Findings

Estimated pentaquark mass at 1720 MeV

Model suggests a possible nonstrange cousin of Theta+

Encourages further detailed investigations

Abstract

We discuss the implications of the suggested interpretation of the recently reported narrow pi N resonance (width \approx 25 MeV at 1680 MeV) as a pentaquark in the same multiplet as the Theta+. We consider a diquark-triquark pentaquark model involving a recoupling of the five quarks into a diquark-triquark system in non-standard color representations. We estimate the mass using a well-tested simple mass formula. Our rough numerical estimate puts the pi N pentaquark resonance at 1720 MeV, sufficiently close to the reported value of 1680 MeV to indicate that this approach deserves further more accurate investigation.