Ya.I. Azimov (PNPI)

 

Interference of Resonances and Observation of the Theta-pentaquark

 

The talk consists of two parts. The first one discusses the quantum-mechanical interference which is known for many years, but still has many open questions. In the talk I mainly illustrate how the interference of resonances works and distorts manifestations of the resonances. The second part begins with a brief review of the present experimental and theoretical status of the exotic Theta-baryon. Then I describe the recently published observation of the narrow structure in the phi-photoproduction which is most probably a result of the Theta-phi interference.