Nucleon Resonances at Low |t| Excited With p(K,K^')N^*
Abstract
We have examined the production of nucleon states which decay to nπ^+ or pπ^+π^- in K^-p interactions at an incident beam momentum of 11 GeV/c. The data were obtained using the LASS facility at SLAC, and the exposure corresponds to 4 events/nb. In addition, the event trigger yielded very uniform acceptance over a solid angle ≈4π. Partial wave analyses of the nπ^+ and pπ^+π^- systems recoiling against a K^- are in progress. Preliminary results suggest the presence at low momentum transfer squared (|t|<=0.1 (GeV/c)^2) of an excited nucleon state with decay angular distribution consistent with quantum numbers P_11 and mass ≈1400 MeV. This state, which exhibits an extremely steep production angular distribution, would be most naturally interpreted as the first radial excitation of the nucleon.
- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- October 1996
- Bibcode:
- 1996APS..DNP..BF05N