Threshold hyperon production in proton-proton collisions at COSY-11

Rozek, T.; Kamys, B.; Budzanowski, A.; Zipper, W.; Kowina, P.; Khoukaz, A.; Smyrski, J.; Oelert, W.; Ritman, J.; Täschner, A.; Adam, H. H.; Przerwa, J.; Janusz, M.; Sefzick, T.; Grzonka, D.; Zhang, Z.; Wüstner, P.; Wolke, M.; Czyzykiewicz, R.; Piskor-Ignatowicz, C.; Siemaszko, M.; Moskal, P.; Winter, P.; Jarczyk, L.; Klaja, P.; Kilian, K.

doi:10.1016/j.physletb.2006.07.066

Journal Article

Threshold hyperon production in proton-proton collisions at COSY-11

Rozek, T.FZJ* ; Grzonka, D.FZJ* ; Adam, H. H. ; Budzanowski, A. ; Czyzykiewicz, R.FZJ* ; Janusz, M.FZJ* ; Jarczyk, L. ; Kamys, B. ; Khoukaz, A. ; Kilian, K.FZJ* ; Klaja, P.FZJ* ; Kowina, P.FZJ* ; Moskal, P.FZJ* ; Oelert, W.FZJ* ; Piskor-Ignatowicz, C.FZJ* ; Przerwa, J.FZJ* ; Ritman, J.FZJ* ; Sefzick, T.FZJ* ; Siemaszko, M.FZJ* ; Smyrski, J. ; Täschner, A. ; Winter, P.FZJ* ; Wolke, M.FZJ* ; Wüstner, P.FZJ* ; Zhang, Z.FZJ* ; Zipper, W.

2006
North-Holland Publ. Amsterdam

Physics letters / B 643, 251 - 256 (2006) [10.1016/j.physletb.2006.07.066]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10570 doi:10.1016/j.physletb.2006.07.066

Abstract: The Sigma(+) hyperon production was measured at the COSY-11 spectrometer via the pp -> nK(+)Sigma(+) reaction at excess energies of Q = 13 MeV and Q = 60 MeV. These measurements continue systematic hyperon production studies via the pp -> pK(+)Lambda/Sigma(0) reactions where a strong decrease of the cross section ratio close-to-threshold was observed. In order to verify models developed for the description of the Lambda and Sigma(0) production we have performed the measurement on the Sigma(+) hyperon and found unexpectedly that the total cross section is by more than one order of magnitude larger than predicted by all anticipated models. After the reconstruction of the kaon and neutron four momenta, the Sigma(+) is identified via the missing mass technique. Details of the method and the measurement will be given and discussed in view of theoretical models. (c) 2006 Elsevier B.V. All rights reserved.

Keyword(s): p p: exclusive reaction ; Sigma+: hadroproduction ; K+: associated production ; threshold ; channel cross section ; mass spectrum: missing-mass ; Lambda: hadroproduction ; Sigma0: hadroproduction ; cross section: parametrization ; final-state interaction ; meson: exchange ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> Sigma+ n K+ ; 2.60: 2.74 GeV ; strangeness (auto) ; kaon (auto) ; near threshold hyperon production (auto) ; signia productions (auto) ; COSY-11 (auto)