https://doi.org/10.1140/epja/i2006-10087-7
Hadron Physics
Scalar-isovector K¯ production close to threshold
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, Universität zu Köln, 50937, Köln, 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, Universität Münster, 48149, Münster, Germany
9
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, 53115, Bonn, Germany
10
The Andrzej Sołtan Institute for Nuclear Studies, 05400, Świerk, Poland
Received:
18
May
2006
Accepted:
21
August
2006
Published online:
12
September
2006
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.
PACS: 25.10.+s Nuclear reactions involving few-nucleon systems – / 13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy ⩽ 10GeV) –
© Società Italiana di Fisica and Springer-Verlag, 2006