Evidence for a non- $$q\bar q$$ tensor meson at 1,410 MeV produced in the reaction π−p
Autor: Daum, C., Hertzberger, L., Hoogland, W., Peters, S., Van Deurzen, P., Berglund, A., Chabaud, V., Gonzalez-Arroyo, A., Hyams, B., Tiecke, H., Weilhammer, P., Dwurazny, A., Palka, H., Polok, G., Rybicki, K., Turala, M., Turnau, J., Zalewska, A., Becker, H., Blanar, G., Cerrada, M., Dietl, H., Gallivan, J., Glaubman, M., Klanner, R., Lorenz, E., Lütjens, G., Lutz, G., Männer, W., Pugl, A., Stierlin, U., Blakey, J., Bowler, M., Cashmore, R., Loken, J., Spalding, J., Thompson, G., Alper, B., Damerell, C., Gillman, A., Hardwick, J., Wickens, F.
Zdroj: Zeitschrift für Physik C Particles and Fields; December 1984, Vol. 23 Issue: 4 p339-347, 9p
Abstrakt: We present an analysis of theKs0Ks0 system produced in the reaction π−p→Ks0Ks0n at 63 GeV based on ∼700 events in the kinematical region of |t|<0.5 GeV2. We concentrate on masses between 1,200 and 1,600 MeV where a double maximum structure is observed. Performing an amplitude analysis in this mass interval we find thatS,D0 andD+ waves contribute to the mass spectrum at approximately equal strength. The peaks are attributed to spin 2 waves. However, we failed to explained them by interferingf(1270),A2(1310) andf′(1520) resonances alone. While the first peak can be associated withf(1270)−A2(1310) production, an additional tensor meson is needed with mass of ∼1410 MeV and a narrow width for a description of the second one. The analysis as well as the energy dependence deduced from some publishedKs0Ks0 mass spectra suggests this object to be dominantly produced by a natural parity exchange. Because the 2++ $$q\bar q$$ nonet is already complete the nature of the new tensor meson is an open question.
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