The pp-&gt;K+n Sigma+ reaction near threshold

Valdau, Y.; Mikirtychyants, S.; Nekipelov, M.; Dymov, S.; Wilkin, C.; Koptev, V.; Kacharava, A.; Hartmann, M.; Barsov, S.; Merzliakov, S.; Schleichert, R.; Ströher, H.; Mussgiller, A.; Büscher, M.

doi:10.1016/j.physletb.2007.07.018

Journal Article

The pp->K+n Sigma+ reaction near threshold

Valdau, Y. ; Koptev, V. ; Barsov, S. ; Büscher, M.FZJ* ; Dymov, S. ; Hartmann, M.FZJ* ; Kacharava, A. ; Merzliakov, S. ; Mikirtychyants, S. ; Mussgiller, A. ; Nekipelov, M.FZJ* ; Schleichert, R.FZJ* ; Ströher, H.FZJ* ; Wilkin, C.

2007
North-Holland Publ. Amsterdam

Physics letters / B 652, 245 - 249 (2007) [10.1016/j.physletb.2007.07.018]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10524 doi:10.1016/j.physletb.2007.07.018

Abstract: Inclusive K+ production in proton-proton collisions has been measured at a beam energy of 2.16 GeV using the COSY-ANKE magnetic spectrometer. The resulting spectrum, as well as those corresponding to K+ p and K+ pi(+) correlated pairs, can all be well described using consistent values of the total cross sections for the pp -> K+ p Lambda, pp -> K+ p Sigma(0), and pp -> K+ n Sigma(+) reactions. While the resulting values for Lambda and Sigma(0) production are in good agreement with world data, our value for the total Sigma(+) production cross section, sigma (pp -> K+ n Sigma(+)) = (2.5 +/- 0.6(stat) +/- 0.4(syst)) mu b at an excess energy of epsilon = 129 MeV, could only be reconciled with other recently published data if there were a highly unusual near threshold behaviour. (c) 2007 Elsevier B.V. All rights reserved.

Keyword(s): p p: inclusive reaction ; K+: hadroproduction ; K+: momentum spectrum ; mass spectrum: missing-mass ; hyperon: associated production ; threshold ; Sigma+ ; Sigma0 ; Lambda ; channel cross section: energy dependence ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> Sigma+ n K+ ; p p --> p K+ anything ; p p --> K+ pi+ anything ; 2.16 GeV ; kaon production (auto) ; sigma production (auto) ; threshold effects (auto)