Journal Club: Pentaquarks

Fri., Sep. 25, 2020 3:30 p.m. - Fri., Sep. 25, 2020 4:30 p.m.

Location: Zoom

Abstract: The combination of four quarks and an antiquark is allowed by the theory of quantum chromodynamics. This combination of quarks and antiquark is called the pentaquark Theta+ (third category of hadrons). However theory is not the real proof of declaring that particles exist. Before 2002 there was no experimental proof that such state of four quarks and an antiquark exists in particle physics. The first experimental results showing that the Theta+ exist were presented by a Japanese group in 2002. According to this group, the Theta+ consists of four light quarks and a strange antiquark. A lot of experimental results come up after the Japanese group, suggesting the evidence of the Theta+. A very exciting history of discovery of the Theta+ state. Furthermore the talk would be extended to the recent discovery of the "open-charm" tetraquark from the LHCb experiment at CERN. I will try to cover the history of the Theta+ and the tetraquark in our departmental journal club as much as possible.

Journal Article "On the conundrum of the pentaquark"

Speaker: Vijay Kumar, University of Regina