Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495049 | Physics Letters B | 2017 | 5 Pages |
Abstract
We report a partial-wave analysis of new data on the double-polarization variable E for the reactions γpâÏ+n and γpâÏ0p and of further data published earlier. The analysis within the Bonn-Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star Î(2200)7/2â. This is the lowest-mass Îâ resonance with spin-parity JP=7/2â. Its mass is significantly higher than the mass of its parity partner Î(1950)7/2+ which is the lowest-mass Îâ resonance with spin-parity JP=7/2+. It has been suggested that chiral symmetry might be restored in the high-mass region of hadron excitations, and that these two resonances should be degenerate in mass. Our findings are in conflict with this prediction.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
A.V. Anisovich, V. Burkert, J. Hartmann, E. Klempt, V.A. Nikonov, E. Pasyuk, A.V. Sarantsev, S. Strauch, U. Thoma,