3 years ago

# Total and differential cross sections of $\eta$-production in proton-deuteron fusion for excess energies between $Q_\eta=13\;\text{MeV}$ and $Q_\eta=81\;\text{MeV}$.

E. Perez del Rio, D. Prasuhn, I. Ciepał, S. Kistryn, M. Büscher, D. Lersch, C.-O. Gullström, P. Kulessa, A. Goswami, B. Kłos, B. Lorentz, A. Magiera, D. Pszczel, H. Kleines, K. Grigoryev, E. Czerwiński, W. Erven, P. Marciniewski, C. Hanhart, A. Kuzmin, A. Khreptak, P. Fedorets, K. Demmich, P. Adlarson, W. Eyrich, M. Bashkanov, W. Bardan, R. Engels, W. Augustyniak, H. Ohm, H.-P. Morsch, N. Hüsken, K. Föhl, L. Heijkenskjöld, K. Fransson, A. Kupść, N. M. Piskunov, W. Parol, B. Mariański, G. Kemmerling, M. Berłowski, G. Khatri, F. Goldenbaum, B. Kamys, R. Maier, A. Khoukaz, L. Jarczyk, A. Erven, H. Calén, T. Johansson, P. Moskal, D. A. Kirillov, K. Lalwani, F. S. Bergmann, V. Hejny, H. Clement, A. Bondar, W. Krzemień

New data on both total and differential cross sections of the production of $\eta$ mesons in proton-deuteron fusion to ${}^3\text{He}\,\eta$ in the excess energy region $13.6\;\text{MeV}\leq Q_\eta \leq 80.9\;\text{MeV}$ are presented. These data have been obtained with the WASA-at-COSY detector setup located at the Forschungszentrum J\"ulich, using a proton beam at 15 different beam momenta between $p_p = 1.60\;\text{GeV}/c$ and $p_p = 1.74\;\text{GeV}/c$. While significant structure of the total cross section is observed in the energy region $20\;\text{MeV}\lesssim Q_\eta \lesssim 60\;\text{MeV}$, a previously reported sharp variation around $Q_\eta\approx 50\;\text{MeV}$ cannot be confirmed. Angular distributions show the typical forward-peaking that was reported elsewhere. For the first time, it is possible to study the development of these angular distributions with rising excess energy over a large interval.

Publisher URL: http://arxiv.org/abs/1801.06671

DOI: arXiv:1801.06671v1

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