Journal article

Publication year: 2004

Journal: Physical Review C

Volume number: 69

Issue number: 6

ISSN: 0556-2813

eISSN: 1089-490X

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevC.69.064003

Publisher: 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.

Harvard Citation style: 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 Citation style: 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