Higher Partial Waves in p+p->p+p+eta near Threshold
H. Calen, J. Dyring, G. Faldt, K. Fransson, L. Gustafsson, S. Haggstrom, B. Hoistad, J. Johanson, A. Johansson, T. Johansson, S. Kullander, A. Mortsell, R. Ruber, J. Zlomanczuk, C. Ekstrom, K. Kilian, W. Oelert, T. Sefzick, R. Bilger, W. Brodowski, H. Clement, G. J. Wagner, A. Bondar, A. Kuzmin, B. Shwartz, V. Sidorov, A. Sukhanov, V. Dunin, B. Morosov, A. Povtorejko, A. Sukhanov, A. Zernov, A. Kupsc, P. Marciniewski, J. Stepaniak, J. Zabierowski, A. Turowiecki, Z. Wilhelmi, C. Wilkin
Abstract
Exclusive measurements of the production of eta mesons in the p+p->p+p+eta reaction have been carried out at excess energies of 16 and 37 MeV above threshold. The deviations from phase space are dominated by the proton-proton final state interaction and this influences particularly the energy distribution of the eta meson. However, evidence is also presented at the higher energy for the existence of an anisotropy in the angular distributions of the eta meson and also of the final proton-proton pair, probably to be associated with D-waves in this system interfering with the dominant S-wave term. The sign of the eta angular anisotropy suggests that rho-exchange is important for this reaction.
Create a lesson
Related papers
Direct measurement of the in-medium η mass spectrum through the γγ decay channel
Y. Matsumura, N. Muramatsu, T. A. Hashimoto et al.
STAR Highlights II: Study of Small Systems and the Search for New, Exotic Physics
Jiangyong Jia
Cluster emission and its impact on the r-process nucleosynthesis
Natalia Thomas, Silvia Bara, Thomas Elias Cocolios et al.
Core Breaking at Low Spin in 68Zn from Nuclear Resonance Fluorescence
S. R. Johnson, R. V. F. Janssens, B. A. Brown et al.
Isoscalar Giant Resonances in the even-A Pd Isotopes
J. Arroyo, U. Garg, T. Furuno et al.
Efficient production of 229m,gTh via neutron capture in VUV-transparent crystals
Zhong-yi Chen, Hao-yang Lan, Di Wu et al.