Friday, March 1, 2013

1302.7210 (Q. J. Ye et al.)

The production of K+K- pairs in proton-proton collisions below the phi
meson threshold

Q. J. Ye, M. Hartmann, D. Chiladze, S. Dymov, A. Dzyuba, H. Gao, R. Gebel, V. Hejny, A. Kacharava, B. Lorentz, D. Mchedlishvili, S. Merzliakov, M. Mielke, S. Mikirtytchiants, H. Ohm, M. Papenbrock, A. Polyanskiy, V. Serdyuk, H. J. Stein, H. Stroeher, S. Trusov, Yu. Valdau, C. Wilkin, P. Wuestner
The pp -> ppK+K- reaction was measured below the phi threshold at a beam energy of 2.568 GeV using the COSY-ANKE magnetic spectrometer. By assuming that the four-body phase space is distorted only by the product of two-body final state interactions, fits to a variety of one-dimensional distributions permit the evaluation of differential and total cross sections. The shapes of the distributions in the Kp and Kpp invariant masses are reproduced only if the K-p interaction is even stronger than that found at higher energy. The cusp effect in the K+K- distribution at the K0K0bar threshold is much more clear and some evidence is also found for coupling between the K-p and K0bar n channels. However, the energy dependence of the total cross section cannot be reproduced by considering only a simple product of such pair-wise final state interactions.
View original:

No comments:

Post a Comment