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

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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

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classification ✦ hep-ex

keywords pbarcrosssectionantiprotonenergyscanannihilationsantiproton-proton

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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/c^2 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/c^2, which is consistent with the f2(2150) resonance.

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

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