Scalar-isovector K¯ production close to threshold

Dzyuba, A.; Kondratyuk, L; Maeda, Y.; Kleber, V.; Sibirtsev, A.; Chernyshev, V. P.; Dymov, S.; Ströher, H.; Hejny, V.; Kulessa, P.; Nekipelov, M.; Fedorets, P; Grishina, V.; Mersmann, T.; Hartmann, M.; Büscher, M.; Mikirtychyants, S.; Stein, H. J.; Koptev, V.; Prasuhn, D.; Schleichert, R.; Hanhart, C.; Zychor, I.

doi:10.1140/epja/i2006-10087-7

Journal Article

Scalar-isovector K¯ production close to threshold

Dzyuba, A. ; Kleber, V. ; Büscher, M.FZJ* ; Chernyshev, V. P.FZJ* ; Dymov, S. ; Fedorets, P.FZJ* ; Grishina, V. ; Hanhart, C.FZJ* ; Hartmann, M.FZJ* ; Hejny, V.FZJ* ; Kondratyuk, L. ; Koptev, V. ; Kulessa, P. ; Maeda, Y. ; Mersmann, T. ; Mikirtychyants, S. ; Nekipelov, M.FZJ* ; Prasuhn, D.FZJ* ; Schleichert, R.FZJ* ; Sibirtsev, A.FZJ* ; Stein, H. J.FZJ* ; Ströher, H.FZJ* ; Zychor, I.

2006
Springer Berlin

The European physical journal / A 29, 245 - 251 (2006) [10.1140/epja/i2006-10087-7]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10581 doi:10.1140/epja/i2006-10087-7

Abstract: The reaction pp --> dK(+) (K) over bar (0) has been investigated at excess energies Q=47.4 and 104.7 MeV above the K+(K) over bar (0) threshold at COSY Julich. Coincident dK(+) pairs were detected with the ANKE spectrometer, and subsequently similar to 2000 events with a missing (K) over bar (0) invariant mass were identified, which fully populate the Dalitz plot. The joint analysis of invariant mass and angular distributions reveals s-wave dominance between the two kaons, in conjunction with a p-wave between the deuteron and the kaon pair, i.e. K (K) over bar production via the a(0)(+)(980) channel. Integration of the differential distributions yields total cross-sections of sigma(pp -->dK(+)(K) over bar (0))=(38 +/- 2(stat) +/- 14(syst)) nb and(190 +/- 4(stat) +/- 39(syst)) nb for the low and high Q value, respectively.

Keyword(s): p p: exclusive reaction ; K+: hadroproduction ; anti-K0: associated production ; threshold ; mass spectrum: (deuteron K+) ; mass spectrum: missing-mass ; angular distribution ; partial wave analysis ; a0(980) ; channel cross section ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> deuteron anti-K0 K+ ; 2.65: 2.83 GeV-kin