We are talking about an exotic pentaquark and a bonded pair of tetraquarks containing a new type of tetraquark. Thus, the list of hadrons found in the Large Hadron Collider has been replenished.
A new pentaquark has reportedly been discovered as part of the analysis of the decay events of negatively charged B mesons. It consists of a magic quark and an antiquark, along with an up, down, and strange quark. All this makes it the first pentaquark in history to contain a strange quark.
According to experts, the statistical significance level of the discovery was 15 (sigma). For comparison, in particle physics in general, the discovery of a particle is already talked about at a significance level above five sigma.
In contrast, in a joint analysis of the decays of the positively charged and neutral B mesons, a new double-charged tetraquark with a clear attraction to its neutral counterpart was observed. Sigma scores were 6.5 for the first and 8 sigma for the second.
Source: Ferra
