/ Experiment-Nucl arXiv:0911.1012


The pd ---> He-3 eta pi0 reaction at T(p) = 1450 MeV


Schonning, K. (Uppsala U., Inst. Theor. Phys.) ; Bargholtz, Chr. (Stockholm U.) ; Bashkanov, M. (Tubingen U.) ; Berlowski, M. (Warsaw, Inst. Nucl. Studies) ; Bogoslawsky, D. (Dubna, JINR) ; Calen, H. (Uppsala U., Inst. Theor. Phys.) ; Clement, H. (Tubingen U.) ; Demirors, L. (Hamburg U.) ; Ekstrom, C. (Uppsala U.) ; Fransson, K. (Uppsala U., Inst. Theor. Phys.) ; Geren, L. (Stockholm U.) ; Gustafsson, L. (Uppsala U., Inst. Theor. Phys.) ; Hoistad, B. (Uppsala U., Inst. Theor. Phys.) ; Ivanov, G. (Dubna, JINR) ; Jacewicz, M. (Uppsala U., Inst. Theor. Phys.) ; Jiganov, E. (Dubna, JINR) ; Johansson, T. (Uppsala U., Inst. Theor. Phys.) ; Keleta, S. (Uppsala U., Inst. Theor. Phys.) ; Khakimova, O. (Tubingen U.) ; Kren, F. (Tubingen U.) ; Kullander, S. (Uppsala U., Inst. Theor. Phys.) ; Kupsc, A. (Uppsala U., Inst. Theor. Phys.) ; Kuzmin, A. (Novosibirsk, IYF) ; Lindberg, K. (Stockholm U.) ; Marciniewski, P. (Uppsala U., Inst. Theor. Phys.) ; Morosov, B. (Dubna, JINR) ; Oelert, W. (Julich, Forschungszentrum) ; Pauly, C. (Hamburg U.) ; Petren, H. (Uppsala U., Inst. Theor. Phys.) ; Petukhov, Y. (Dubna, JINR) ; Povtorejko, A. (Dubna, JINR) ; Scobel, W. (Hamburg U.) ; Shafigullin, R. (Moscow Phys. Eng. Inst.) ; Shwartz, B. (Novosibirsk, IYF) ; Skorodko, T. (Tubingen U.) ; Sopov, V. (Moscow, ITEP) ; Stepaniak, J. (Warsaw, Inst. Nucl. Studies) ; Tegner, P.-E. (Stockholm U.) ; Thorngren Engblom, P. (Uppsala U., Inst. Theor. Phys.) ; Tikhomirov, V. (Dubna, JINR) ; Turowiecki, A. (Warsaw U.) ; Wagner, G.J. (Tubingen U.) ; Wilkin, C. (University Coll. London) ; Wolke, M. (Julich, Forschungszentrum) ; Zabierowski, J. (Lodz, IPJ) ; Zartova, I. (Stockholm U.) ; Zlomanczuk, J. (Uppsala U., Inst. Theor. Phys.)

Published in: Phys.Lett.
Year: 2010
Vol.: B685
Page No: 33-37
Pages: 10

Abstract: The cross section for the pd --> ^3He eta pi0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one ^3He and four photons from the decays of the two photons. The data indicate that the production mechanism involves the formation of the Delta(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final state particles are well reproduced by a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the pi^0 momentum in the ^3Hepi^0 system.

Keyword(s): eta, pi 0 meson production ; Invariant-mass distribution ; Delta resonance

Web-Page: http://inspirebeta.net/record/836167/files/im_ethe_wt1.png; http://inspirebeta.net/record/836167/files/im_pihe_wt1.png; http://inspirebeta.net/record/836167/files/mm1_3hepi0_1450.png; http://inspirebeta.net/record/836167/files/mm_3he_wt1.png; http://inspirebeta.net/record/836167/files/wasa_setup3.png

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