The Three-Pion Decays of the a1(1260)

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 60-66
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/0253-6102/70/1/60

摘要

We investigate the decay of a1+(1260) → π+π+π-with the assumption that the a1(1260) is dynamically generated from the coupled channel pπ and (K)K* interactions.In addition to the tree level diagrams that proceed via a1+(1260) → p0π+ → π+π+π-,we take into account also the final state interactions of ππ → π and K(K) → ππ.We calculate the invariant π+ π-mass distribution and also the total decay width of a1+ (1260) → π+ π+ π-as a function of the mass of a1 (1260).The calculated total decay width of a1 (1260) is significantly different from other model calculations and tied to the dynamical nature of the a1(1260) resonance.The future experimental observations could test of model calculations and would provide vary valuable information on the relevance of the pπ component in the al (1260) wave function.