Scalar-isovector K¯ production close to threshold
/ Authors
A. Dzyuba, A. Dzyuba, V. Kleber, M. Büscher, V. Chernyshev, S. Dymov, P. Fedorets, V. Grishina, C. Hanhart, M. Hartmann
and 17 more authors
V. Hejny, L. Kondratyuk, V. Koptev, P. Kulessa, Y. Maeda, Y. Maeda, T. Mersmann, S. Mikirtychyants, M. Nekipelov, M. Nekipelov, D. Prasuhn, R. Schleichert, A. Sibirtsev, A. Sibirtsev, H. Stein, H. Ströher, I. Zychor
/ Abstract
Abstract.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 a0+(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.
Journal: The European Physical Journal A - Hadrons and Nuclei