Dr
Qiang Zhao
(Institute of High Energy Physics, Chinese Academy of Sciences and Department of Physics, University of Surrey)
12/09/2013, 16:40
We raise the issue on the nature of the eta(1405) and eta(1475). We will show that so far there is no strong evidence for their being individual states. In particular, there exists a so-called "triangle singularity" mechanism which will alter the lineshape and shift the mass of a state eta(1440) in its decays into KK-bar pi, eta pipi, and 3pi.
