Study of electromagnetic decays of orbitally excited Baryons

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他208名*

Physical Review D, 102(7), p.071103_1 - 071103_8, 2020/10

https://doi.org/10.1103/PhysRevD.102.071103

Using 980 fb of data collected with the Belle detector operating at the KEKB asymmetric-energy collider, we report a study of the electromagnetic decays of excited and . A clear signal (8.6 standard deviations) is observed for , and we measure: . We also present evidence (3.8 standard deviations) for the similar decay of the and measure: . The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the and baryons and set upper limits at the 90% confidence level of: and Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.