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Measurement of the pbar p -> Ks Ks Reaction from 0.6 to 1.9 GeV/c

C. Evangelista, A. Palano, D. Drijard, N. H. Hamann, R. T. Jones, B. Mouellic, S. Ohlsson, J. -M. Perreau, W. Eyrich, M. Moosburger, S. Pomp, F. Stinzing, H. Fischer, J. Franz, E. Rossle, H. Schmitt, H. Wirth, A. Buzzo, K. Kirsebom, M. Lo Vetere, M. Macri, M. Marinelli, S. Passaggio, M. G. Pia, A. Pozzo, E. Robutti, A. Santroni, P. T. Debevec, R. A. Eisenstein, P. G. Harris, D. W. Hertzog, S. A. Hughes, P. E. Reimer, J. Ritter, R. Geyer, K. Kilian, W. Oelert, K. Rohrich, M. Rook, O. Steinkamp, H. Korsmo, B. Stugu, T. Johansson

hep-exarXiv:hep-ex/9707041

Abstract

The pbar p -> Ks Ks -> 4pi+/- cross section was measured at incident antiproton momenta between 0.6 and 1.9 GeV/c using the CERN Low Energy Antiproton Ring (LEAR). This investigation was part of a systematic study of in-flight antiproton-proton annihilations into two-neutral-meson final states in a search for hadronic resonances. A coarse scan of the pbar p -> Ks Ks cross section as a function of center-of-mass energy between 1.964 and 2.395 GeV/c2 and a fine scan of the region surrounding the Xi(2220) are presented. Upper limits on the product branching ratio BR(Xi -> pbar p)BR(Xi -> Ks Ks) are determined for a wide range of mass and width assumptions based on the non-observation of the Xi(2220). A rise in the pbar p -> Ks Ks cross section is observed near 2.15 GeV/c2, which is consistent with the f2(2150) resonance.

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