P-wave dominance in the pd -> 3He pi+ pi- reaction near threshold measured with the MOMO experiment at COSY

F. Bellemann; A. Berg; J. Bisplinghoff; G. Bohlscheid; J. Ernst; C. Henrich; F. Hinterberger; R. Ibald; R. Jahn; L. Jarczyk; R. Joosten; A. Kozela; H. Machner; A. Magiera; R. Maschuw; T. Mayer-Kuckuk; G. Mertler; J. Munkel; P. von Neumann-Cosel; D. Rosendaal; P. von Rossen; H. Schnitker; K. Scho; J. Smyrski; A. Strzalkowski; R. Toelle; C. Wilkin

arXiv · nucl-ex/9812011

P-wave dominance in the pd -> 3He pi+ pi- reaction near threshold measured with the MOMO experiment at COSY

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Abstract

The cross section of the pd -> 3He pi+ pi - reaction has been measured at the MOMO facility in a kinematically complete experiment at a c. m. excess energy of Q = 70 MeV. The energy and angular distributions show that the reaction is dominated by p-wave pi+ pi- pairs. This is in complete contrast to the results of inclusive measurements at somewhat higher energies which show a strong s-wave ABC enhancement at low pi pi masses. There are however indications of p-wave pion pairs from other experiments at low Q.

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F. Bellemann, A. Berg, J. Bisplinghoff, G. Bohlscheid, J. Ernst, C. Henrich, F. Hinterberger, R. Ibald, R. Jahn, L. Jarczyk, R. Joosten, A. Kozela, H. Machner, A. Magiera, R. Maschuw, T. Mayer-Kuckuk, G. Mertler, J. Munkel, P. von Neumann-Cosel, D. Rosendaal, P. von Rossen, H. Schnitker, K. Scho, J. Smyrski, A. Strzalkowski, R. Toelle, C. Wilkin. 1998-12-24. P-wave dominance in the pd -> 3He pi+ pi- reaction near threshold measured with the MOMO experiment at COSY. https://arxiv.org/abs/nucl-ex/9812011

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