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.

arXiv comment7 pages, 6 figures

References in corpus (6)

• Precision study of the eta-3He system using the d+p->3He+eta reaction
• $\varphi$ and $\omega$ Meson Production in pp Reactions at $p_{lab}$=3.67 GeV/c
• Exclusive Measurements of $pd{\to }^{3}He\pi \pi$ : the $ABC$ Effect Revisited
• 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
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Cited by in corpus (5)

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• ABC Effect and Resonance Structure in the Double-Pionic Fusion to ${}^3$He
• Total and differential cross sections of $\eta$-production in proton-deuteron fusion for excess energies between $Q_{\eta }=13\text{MeV}$ and $Q_{\eta }=81\text{MeV}$
• Experimental and theoretical study of deuteron-proton elastic scattering for proton kinetic energies between $T_p=882.2\text{MeV}$ and $T_p=918.3\text{MeV}$
• Study of the pd(dp) -> 3He pi pi reactions close to threshold