Three-body final state interaction in $η\to 3 π$ updated

In view of the recent high-statistic KLOE data for the η→π$^+$π$^−$π$^0$ decay, a new determination of the quark mass double ratio has been done. Our approach relies on a dispersive model that takes into account rescattering effects between three pions via subenergy unitarity. The latter is essential to reproduce the Dalitz plot distribution. A simultaneous description of the KLOE and WASA-at-COSY data is achieved in terms of just two real parameters. From a global fit, we determine Q=21.6±1.1. The predicted slope parameter for the neutral channel α=−0.025±0.004 is in reasonable agreement with the PDG average value.


Publication Date:
Jun 06 2017
Date Submitted:
Aug 10 2018
Pagination:
497-502
ISSN:
0370-2693
Citation:
Physics Letters B
B771
Note:
A freely accessible, full text version is available using the link(s) in External Resources.
External Resources:




 Record created 2018-08-10, last modified 2019-04-03


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)