Isospin effects in the exclusive dp -> 3Heπ+π- reaction

Abstract

The differential cross section for the exclusive dp -> 3Heπ+π- 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 π+π- spectrum, the differences detected between the π+3He and π-3He invariant-mass distributions show that there must be some isospin-one ππ production even at relatively low excess energies. The invariant-mass differences are modeled in terms of the sequential decay N*(1440) -> Delta(1232)π -> Nππ.

7 pages, 6 figures

References in corpus (3)

• Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction
• Exclusive measurement of two-pion production in the dd --> 4Hepipi reaction
• New determination of the mass of the eta meson at COSY-ANKE

Cited by in corpus (3)

• Brief Review of Recent Advances in Understanding Dark Matter and Dark Energy
• ABC Effect and Resonance Structure in the Double-Pionic Fusion to ${}^3$He
• Study of the pd(dp) -> 3He pi pi reactions close to threshold