Scalar-isovector K K-bar production close to threshold
Abstract
The reaction pp -> d K^+ K^0-bar has been investigated at excess energies Q = 47.4 and 104.7 MeV above the K^+ K^0-bar threshold at COSY-Juelich. Coincident dK^+ pairs were detected with the ANKE spectrometer, and events with a missing K^0-bar invariant-mass subsequently identified. 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-bar production via the a_0^+(980) channel. Integration of the differential distributions yields total cross sections of sigma(pp -> d K^+ K^0-bar) = (38 +/- 2(stat) +/- 14(syst)) nb and 190 +/- 4(stat) +/- 39(syst)) nb for the low and high Q values, respectively.
Keywords
Cite
@article{arxiv.nucl-ex/0605030,
title = {Scalar-isovector K K-bar production close to threshold},
author = {A. Dzyuba and V. Kleber and M. Buescher and V. P. Chernyshev and S. Dymov and P. Fedorets and V. Grishina and C. Hanhart and M. Hartmann and V. Hejny and L. Kondratyuk and V. Koptev and P. Kulessa and Y. Maeda and T. Mersmann and S. Mikirtychyants and M. Nekipelov and D. Prasuhn and R. Schleichert and A. Sibirtsev and H. J. Stein and H. Stroeher and I. Zychor},
journal= {arXiv preprint arXiv:nucl-ex/0605030},
year = {2008}
}
Comments
7 pages, 6 figures; accepted for publication in Eur.Phys.J. A