Journalartikel
Autorenliste: Balestra, F; Bedfer, Y; Bertini, R; Bland, LC; Brenschede, A; Brochard, F; Bussa, MP; Choi, S; Colantoni, ML; Dressler, R; Dzemidzic, M; Faivre, JC; Ferrero, A; Ferrero, L; Foryciarz, J; Fröhlich, I; Frolov, V; Garfagnini, R; Grasso, A; Heinz, S; Jacobs, WW; Kühn, W; Maggiora, A; Maggiora, M; Manara, A; Panzieri, D; Pfaff, HW; Piragino, G; Popov, A; Ritman, J; Salabura, P; Tchalyshev, V; Tosello, F; Vigdor, SE; Zosi, G
Jahr der Veröffentlichung: 2004
Zeitschrift: Physical Review C
Bandnummer: 69
Heftnummer: 6
ISSN: 0556-2813
eISSN: 1089-490X
Open Access Status: Green
DOI Link: https://doi.org/10.1103/PhysRevC.69.064003
Verlag: American Physical Society
Abstract:
Differential cross sections for the exclusive reaction pp-->ppeta observed via the eta-->pi(+)pi(-)pi(0) decay channel have been measured at T-beam=2.15 GeV, 2.50 GeV, and 2.85 GeV (excess energies 324 MeV, 412 MeV, and 554 MeV). The influence of the N(1535)S-11 resonance is clearly seen in the invariant mass and momentum dependent differential cross sections. The extracted resonance parameters are compatible with existing data. No significant evidence for further resonance contributions has been found. In addition, angular distributions of the ppeta final state have been measured. The polar angle distribution of the eta shows an anisotropy with respect to the beam axis for the lowest beam energy, which vanishes for the higher energies. The sign of this anisotropy is negative and expected to be sensitive to the dominant production mechanism. In contrast, the proton polar angle in the pp rest frame tends to be more strongly aligned along the beam axis with increasing beam energy. The analyzing power A(y) is compatible with zero for all beam energies.
Zitierstile
Harvard-Zitierstil: Balestra, F., Bedfer, Y., Bertini, R., Bland, L., Brenschede, A., Brochard, F., et al. (2004) Exclusive η production in proton-proton reactions -: art. no. 064003, Physical Review C, 69(6), Article 064003. https://doi.org/10.1103/PhysRevC.69.064003
APA-Zitierstil: Balestra, F., Bedfer, Y., Bertini, R., Bland, L., Brenschede, A., Brochard, F., Bussa, M., Choi, S., Colantoni, M., Dressler, R., Dzemidzic, M., Faivre, J., Ferrero, A., Ferrero, L., Foryciarz, J., Fröhlich, I., Frolov, V., Garfagnini, R., Grasso, A., ...Zosi, G. (2004). Exclusive η production in proton-proton reactions -: art. no. 064003. Physical Review C. 69(6), Article 064003. https://doi.org/10.1103/PhysRevC.69.064003
Schlagwörter
COLLISIONS; MESON PRODUCTION; PHOTOPRODUCTION; PP; TOTAL CROSS-SECTION
