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26 April 2024

» arxiv » 1112.0811

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Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold
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 ;
Date:	5 Dec 2011
Abstract:	The $gamma + p ightarrow K^0 + Sigma^+$ 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.
Source:	arXiv, 1112.0811
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