Measurement of polarisation observables in K⁰_sSigma^+ photoproduction off the proton

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 J. Hannappel W. Hillert P. Hoffmeister I. Jaegle O. Jahn T.C 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 C. 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 gammaphotonsigmameasurementpolarisationreactionrightarrowaddition

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The reaction $\gamma \, p \rightarrow K^0_S\,\Sigma^+$ is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first measurement of photon beam asymmetries in this reaction up to $E_\gamma = 2250$ MeV. In addition, the recoil hyperon polarisation was determined through the asymmetry in the weak decay $\Sigma^+ \rightarrow p \pi^0$ up to $E_\gamma = 1650$ MeV. The data are compared to partial wave analyses, and the possible impact on the interpretation of a recently observed cusp-like structure near the $K^*$ thresholds is discussed.

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Measurement of polarisation observables in K⁰_sSigma^+ photoproduction off the proton

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