arXiv · 1112.0811
Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
Abstract
The $\gamma + p \rightarrow K^0 + \Sigma^+$ photoproduction reaction is investigated in the energy region from threshold to $E_\gamma = 2250$\,MeV. The differential cross section exhibits increasing forward-peaking with energy, but only up to the $K^*$ threshold. Beyond, it suddenly returns to a flat distribution with the forward cross section dropping by a factor of four. In the total cross section a pronounced structure is observed between the $K^*\Lambda$ and $K^*\Sigma$ thresholds. It is speculated whether this signals the turnover of the reaction mechanism from t-channel exchange below the $K^*$ production threshold to an s-channel mechanism associated with the formation of a dynamically generated $K^*$-hyperon intermediate state.
Explore related subjects
Keep this discovery
R. Ewald, A. V. Anisovich, B. Bantes, O. Bartholomy, D. Bayadilov, R. Beck, Y. A. Beloglazov, K. -T. Brinkmann, V. Crede, H. Dutz, D. Elsner, K. Fornet-Ponse, F. Frommberger, Ch. Funke, A. B. Gridnev, E. Gutz, W. Hillert, J. Hannappel, P. Hoffmeister, I. Jaegle, O. Jahn, T. Jude, J. Junkersfeld, H. Kalinowsky, S. Kammer, V. Kleber, Frank Klein, Friedrich Klein, E. Klempt, B. Krusche, M. Lang, H. Löhner, I. V. Lopatin, D. Menze, T. Mertens, J. G. Messchendorp, V. Metag, M. Nanova, V. A. Nikonov, D. Novinski, R. Novotny, M. Ostrick, L. Pant, H. van Pee, A. Roy, A. V. Sarantsev, S. Schadmand, Ch. Schmidt, H. Schmieden, B. Schoch, S. Shende, V. Sokhoyan, A. Süle, V. V. Sumachev, T. Szczepanek, U. Thoma, D. Trnka, R. Varma, D. Walther, Ch. Wendel. 2011-12-04. Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold. https://doi.org/10.1016/j.physletb.2012.05.066
Cite the original work for its findings. Save a collection to share your selection of sources.