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Scalar-isovector K¯ production close to threshold |
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| Authors: | A Dzyuba V Kleber M Büscher V P Chernyshev S Dymov P Fedorets V Grishina C Hanhart M Hartmann V Hejny L Kondratyuk V Koptev P Kulessa Y Maeda T Mersmann S Mikirtychyants M Nekipelov D Prasuhn R Schleichert A Sibirtsev H J Stein H Ströher I Zychor |
| Institution: | 1. High Energy Physics Department, Petersburg Nuclear Physics Institute, 188350, Gatchina, Russia 2. Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany 3. Institut für Kernphysik, Universit?t zu K?ln, 50937, K?ln, Germany 4. Institute for Theoretical and Experimental Physics, Bolshaya Cheremushkinskaya 25, 117218, Moscow, Russia 5. Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Russia 6. Institute for Nuclear Research, 60th October Anniversary Prospect 7A, 117312, Moscow, Russia 7. Institute of Nuclear Physics, Radzikowskiego 152, 31342, Cracow, Poland 8. Institut für Kernphysik, Universit?t Münster, 48149, Münster, Germany 9. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universit?t Bonn, Nu?allee 14-16, 53115, Bonn, Germany 10. The Andrzej So?tan Institute for Nuclear Studies, 05400, ?wierk, Poland |
| Abstract: | The reaction pp → dK +ˉ has been investigated at excess energies Q = 47.4 and 104.7MeV above the K +ˉ threshold at COSY Jülich. Coincident dK+ pairs were detected with the ANKE spectrometer, and subsequently ∼ 2000 events with a missing ˉ 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. Kˉ production via the a 0 +(980) channel. Integration of the differential distributions yields total cross-sections of σ(pp → dK +ˉ) = (38±2stat±14syst)nb and (190±4stat±39syst)nb for the low and high Q value, respectively. |
| Keywords: | 25 10 +s Nuclear reactions involving few-nucleon systems 13 75 -n Hadron-induced low- and intermediate-energy reactions and scattering (energy ⩽ 10GeV) |
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