Isospin effects in the exclusive dp -> 3He{\pi}+{\pi}- reaction

M. Mielke; I. Burmeister; D. Chiladze; S. Dymov; C. Fritzsch; R. Gebel; P. Goslawski; M. Hartmann; A. Kacharava; A. Khoukaz; P. Kulessa; B. Lorentz; T. Mersmann; S. Mikirtychiants; H. Ohm; M. Papenbrock; T. Rausmann; V. Serdyuk; H. Ströher; A. Täschner; Y. Valdau; C. Wilkin

doi:10.1140/epja/i2014-14102-2

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arXiv · 1404.2066

Isospin effects in the exclusive dp -> 3He{\pi}+{\pi}- reaction

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Abstract

The differential cross section for the exclusive dp -> 3He{\pi}+{\pi}- reaction has been measured with high resolution and large statistics over a large fraction of the backward 3He hemisphere at the excess energy 265 MeV using the COSY-ANKE magnetic spectrometer. Though the well-known ABC enhancement is observed in the {\pi}+{\pi}- spectrum, the differences detected between the {\pi}+3He and {\pi}-3He invariant-mass distributions show that there must be some isospin-one {\pi}{\pi} production even at relatively low excess energies. The invariant-mass differences are modeled in terms of the sequential decay N*(1440) -> Delta(1232){\pi} -> N{\pi}{\pi}.

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M. Mielke, I. Burmeister, D. Chiladze, S. Dymov, C. Fritzsch, R. Gebel, P. Goslawski, M. Hartmann, A. Kacharava, A. Khoukaz, P. Kulessa, B. Lorentz, T. Mersmann, S. Mikirtychiants, H. Ohm, M. Papenbrock, T. Rausmann, V. Serdyuk, H. Ströher, A. Täschner, Y. Valdau, C. Wilkin. 2014-04-08. Isospin effects in the exclusive dp -> 3He{\pi}+{\pi}- reaction. https://doi.org/10.1140/epja/i2014-14102-2

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