SEVEN DAYS

摘要

Data from the Large Hadron Collider beauty experiment (LHCb) at CERN, Europe's particle-physics laboratory near Geneva, Switzerland, have confirmed the existence of an exotic particle, Z(4430). The LHCb published the finding on 9 April. The particle is exotic because it may consist of four quarks - fundamental particles that are usually bound in twos or threes and are found in everyday matter. A number of experiments have observed such exotic particles over the past 11 years, but Z(4430) is only the second sighting to be confirmed.