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  • Coupled channel analysis of...
    Albrecht, M; Amsler, C; Dünnweber, W; Faessler, M. A; Heinsius, F. H; Koch, H; Kopf, B

    The European physical journal. C, Particles and fields, 05/2020, Letnik: 80, Številka: 5
    Journal Article

    A partial wave analysis of antiproton-proton annihilation data in flight at 900 Formula omitted into Formula omitted, Formula omitted and Formula omitted is presented. The data were taken at LEAR by the Crystal Barrel experiment in 1996. The three channels have been coupled together with Formula omitted-scattering isospin I = 0 S- and D-wave as well as I = 1 P-wave data utilizing the K-matrix approach. Analyticity is treated using Chew-Mandelstam functions. In the fit all ingredients of the K-matrix, including resonance masses and widths, were treated as free parameters. In spite of the large number of parameters, the fit results are in the ballpark of the values published by the Particle Data Group. In the channel Formula omitted a significant contribution of the spin exotic Formula omitted Formula omitted Formula omitted-wave with a coupling to Formula omitted is observed. Furthermore the contributions of Formula omitted and Formula omitted in the channel Formula omitted have been studied in detail. The differential production cross section for the two reactions and the spin-density-matrix elements for the Formula omitted and Formula omitted have been extracted. No spin-alignment is observed for both vector mesons. The spin density matrix elements have been also determined for the spin exotic wave.