NOTE ON SCALAR MESONS BELOW 2 GEV

• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2016,（10）
• 页码范围: 687-694
• 页数: 8页
• 语种: 中文

摘要

Ⅰ.Introduction:In contrast to the vector and tensor mesons,the identification of the scalar mesons is a long-standing puzzle.Scalar resonances are difficult to resolve because some of them have large decay widths which cause a strong overlap between resonances and background.In addition,several decay channels sometimes open up within a short mass interval (e.g.at the K-K and ηη thresholds),producing cusps in the line shapes of the near-by resonances.Furthermore,one expects non-q-q scalar objects,such as glueballs and multiquark states in the mass range below 2 GeV (for reviews see,e.g.,Refs.[1-5] and the mini-review on non-qq states in this Review of Particle Physics (RPP)).