Bibliographic Details
| Title: |
Evidence for Δ(2200)7/2− from photoproduction and consequence for chiral-symmetry restoration at high mass. |
| Authors: |
Anisovich, A.V.1,2, Burkert, V.3, Hartmann, J.1, Klempt, E.1 klempt@hiskp.uni-bonn.de, Nikonov, V.A.1,2, Pasyuk, E.3, Sarantsev, A.V.1,2, Strauch, S.4, Thoma, U.1 |
| Source: |
Physics Letters B. Mar2017, Vol. 766, p357-361. 5p. |
| Subjects: |
Chirality, Symmetry (Physics), High mass stars, Polarization (Nuclear physics), Parity (Physics) |
| Abstract: |
We report a partial-wave analysis of new data on the double-polarization variable E for the reactions γ p → π + n and γ p → π 0 p 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 Δ ( 2200 ) 7 / 2 − . This is the lowest-mass Δ ⁎ resonance with spin-parity J P = 7 / 2 − . Its mass is significantly higher than the mass of its parity partner Δ ( 1950 ) 7 / 2 + which is the lowest-mass Δ ⁎ resonance with spin-parity J P = 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. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
