At CERN discovered by Russian physicists predicted pentaquark

Scientists from the collaboration LHCb (Large Hadron Collider beauty experiment) as a result of the experiments at the Large Hadron Collider (LHC) was first discovered pentaquark - particle consisting of four quarks and one antiquark. The results of their research will be published in the physics journal Physical Review Letters, and brief them on the CERN website reported.

The new particles have been discovered as a result of collisions of protons at energies up to eight teraelectronvolt. Pentaquark mass does not exceed 4.5 teraelectronvolt. Statistical significance was the discovery of nine sigma. Previously, scientists had known only hadrons (particles composed of quarks and participate in the strong interaction) of two quarks (mesons) and three (baryons, such as protons and neutrons).

Physicists believe that they have found pentaquark consists of two up quarks, one lower, and the charmed quark and an antiquark. According to the theoretical model, pentaquark may be formed as a linked hadron of five quarks, and as a loosely knit (not in the sense of fundamental interactions) of baryon particle (two upper and one lower quarks) and mesons (charmed quark and an antiquark). Physicists in the future are going to continue their studies to study the properties of new particles.

Pentaquarks existence was theoretically predicted in 1997 by Russian physicists Dmitry Dyakonov, Maxim Polyakov and Victor Petrov from the St. Petersburg Institute of Nuclear Physics (was transferred from the jurisdiction of the Russian Academy of Sciences of the National Research Centre “Kurchatov Institute”). Earlier experiments these particles were not detected.

14 July 2015

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