Pentaquarks were discovered in 2015
Pentaquark : Cern researchers discover new particle
Physicists at the European Nuclear Research Center (CERN) have discovered a new particle called pentaquark. Its existence has long been suspected. Several research groups have also presented alleged evidence in the past, but this later turned out to be insufficient.
With the help of the world's largest particle accelerator LHC (Large Hadron Collider), it has now been possible to detect the extremely short-lived pentaquarks, said Cern on Tuesday in Geneva. The scientists rely on measurements from the LHCb experiment. They are very sure of their cause, because they would have approached the particles from different directions - and each time they found confirmation, as the communication shows. The results were sent to the journal "Physical Review Letters".
What holds the quarks together?
Quarks are elementary building blocks of matter. For example, protons and neutrons consist of three quarks each. However, theorists suspect that there are particles that consist of up to five quarks. While the fourfold tetraquarks have not yet been conclusively proven, the fivefold pentaquarks have now apparently been arrested. As "Nature" reports, the statistical certainty is 9 sigma, which is well above 5 sigma, which was considered a quality criterion for the discovery of the Higgs boson.
With the help of the new findings, physicists hope to learn more about the fundamental forces that hold the quarks together - and thus ultimately build matter.
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