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Exclusive measurements of pd ---> He-3 pi pi: The ABC effect revisited


Bashkanov, M. ; Bogoslawsky, D. ; Calen, H. ; Cappellaro, F. ; Clement, H. ; Demiroers, L. ; Ekstrom, Curt ; Fransson, K. ; Greiff, J. ; Gustafsson, L. ; Hoistad, B. ; Ivanov, G. ; Jacewicz, M. ; Jiganov, E. ; Johansson, T. ; Kaskulov, M.M. ; Keleta, S. ; Koch, I. ; Kullander, S. ; Kupsc, A. ; Kuznetsov, A. ; Marciniewski, P. ; Meier, R. ; Morosov, B. ; Oelert, W. ; Pauly, C. ; Petukhov, Y. ; Povtorejko, A. ; Ruber, R.J.M.Y. ; Scobel, W. ; Skorodko, T. ; Shwartz, B. ; Sopov, V. ; Stepaniak, J. ; Tchernyshev, V. ; Thorngren-Engblom, P. ; Tikhomirov, V. ; Turowiecki, A. ; Wagner, G.J. ; Wolke, M. ; Yamamoto, A. ; Zabierowski, J. ; Zlomanczuk, J.

Published in: Phys.Lett.
Year: 2006
Vol.: B637
Page No: 223-228
Pages: 4

Abstract: Exclusive measurements of the reactions $pd\to$ $^3He \pi^+ \pi^-$ and $pd\to$ $^3He \pi^0\pi^0$ have been carried out at $T_p=0.895$ GeV at the CELSIUS storage ring using the WASA detector. The $\pi^+\pi^-$ channel evidences a pronounced enhancement at low invariant $\pi\pi$ masses - as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar $\pi^0\pi^0$ channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. $\Delta\Delta$ calculations give a good description of the data, if a boundstate condition is imposed for the intermediate $\Delta\Delta$ system.

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