An unconventional 4-quark particle

On 9 April 2014, researchers at the LHCb experiment published a paper validating the existence of an exotic particle, which appears to be a tetraquark. The LHCb spokesperson Pierluigi Campana said: “We are very happy to have confirmed this particle, which is in fact a very strange object.”

Precisely 50 years ago, George Zweig and Murray Gell-Mann independently introduced the Quark Model, which is a fundamental cornerstone in particle physics. The model is a perfect tool to understand how matter interacts…