Scalar-isovector K¯ production close to threshold

Dzyuba, A.; Kleber, V.; Büscher, M.; Chernyshev, V.; Dymov, S.; Fedorets, P.; Grishina, V.; Hanhart, C.; Hartmann, M.; Hejny, V.; Kondratyuk, L.; Koptev, V.; Kulessa, P.; Maeda, Y.; Mersmann, T.; Mikirtychyants, S.; Nekipelov, M.; Prasuhn, D.; Schleichert, R.; Sibirtsev, A.
August 2006
European Physical Journal A -- Hadrons & Nuclei;Aug2006, Vol. 29 Issue 2, p245
Academic Journal
The reaction pp → dK +¯ has been investigated at excess energies Q = 47.4 and 104.7MeV above the K +¯ threshold at COSY Jülich. Coincident dK+ pairs were detected with the ANKE spectrometer, and subsequently ∼ 2000 events with a missing ¯ 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¯ production via the a 0+(980) channel. Integration of the differential distributions yields total cross-sections of σ( pp → dK +¯) = (38±2stat±14syst)nb and (190±4stat±39syst)nb for the low and high Q value, respectively.


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