Pentaquarks: review of the experimental evidence

TL;DR

This paper reviews recent experimental evidence for pentaquarks, discussing both observations and non-observations, and analyzes how these findings contribute to understanding their existence.

Contribution

It provides a comprehensive review of experimental results on pentaquarks, highlighting recent discoveries and conflicting data to clarify their status.

Findings

Multiple pentaquark candidates observed in recent experiments

Some experiments report non-observations, indicating conflicting evidence

Discussion on how these results can be integrated into a consistent understanding

Abstract

Pentaquarks, namely baryons made by 4 quarks and one antiquark have been predicted and searched for since several decades without success. Theoretical and experimental advances in the last 2 years led to the observation of a number of pentaquark candidates. We review the experimental evidence for pentaquarks as well as their non-observations by some experiments, and discuss to which extend these sometimes contradicting informations may lead to a consistent picture.