Anomaly in the K⁰_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

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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. L\"ohner 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. S\"ule V. V. Sumachev T. Szczepanek U. Thoma D. Trnka R. Varma D. Walther Ch. Wendel

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keywords crosssectionthresholdsigmaenergygammamechanismphotoproduction

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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.

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Anomaly in the K⁰_S Sigma^+ photoproduction cross section off the proton at the K* threshold

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