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Discovery of the pentaquark

31.07.2015

Physicists from the LHCb collaboration as a result of experiments at the Large Hadron Collider for the first time discovered a pentaquark - a unique particle consisting of four quarks and one antiquark.

New particles weighing no more than 4,5 gigaelectronvolts have been discovered as a result of proton collisions at energies up to eight teraelectronvolts. The statistical significance of the discovery is nine sigma.

Previously, only hadrons of two (mesons) and three (baryons) quarks were known to scientists, and the discovered pentaquark consists of two up and one down quarks, as well as a "charmed" quark and an antiquark.

According to the theoretical model, a pentaquark can be formed either as a bound hadron of five quarks, or as a weakly bound particle of a baryon (two up and one down quarks) and a meson (a "charmed" quark and an antiquark).

Scientists from the European Organization for Nuclear Research (CERN) will continue their research to study the properties of new particles.

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