Exclusive Measurements of $pd\to ^3He ππ$ : the $ABC$ Effect Revisited

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

doi:10.1016/j.physletb.2006.03.082

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Exclusive Measurements of $pd\to ^3He ππ$ : the $ABC$ Effect Revisited

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Abstract

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

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M. Bashkanov, D. Bogoslawsky, H. Calén, F. Cappellaro, H. Clement, L. Demiroers, C. Ekström, K. Fransson, J. Greiff, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, M. M. Kaskulov, S. Keleta, I. Koch, S. Kullander, A. Kupść, A. Kuznetsov, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, C. Pauly, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, W. Scobel, T. Skorodko, B. Shwartz, V. Sopov, J. Stepaniak, V. Tchernyshev, P. Thörngren-Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Zlomanczuk. 2006-09-10. Exclusive Measurements of $pd\to ^3He ππ$ : the $ABC$ Effect Revisited. https://doi.org/10.1016/j.physletb.2006.03.082

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