DPG Phi
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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Hadron Structure and Spectroscopy IV

HK 28.8: Talk

Wednesday, March 29, 2017, 18:45–19:00, F 5

Coherent production of pion pairs in the reaction pdpdππ with the intermediate two-baryon-resonance excitationVladimir Komarov1, Tatyana Azaryan1, Sergey Dymov1,2, and •Dmitry Tsirkov11Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, RU-141980 Dubna, Russia — 2Institut für Kernphysik and Jülich Centre for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany

The reaction pdpd+X was studied at 0.8–2.0 GeV energies with the ANKE setup at the COSY storage ring. The proton-deuteron pairs emerging with high momenta 0.6–1.8 GeV/c were detected at small angles with respect to the proton beam. Distribution over the reaction missing mass Mx reveals an enhancement near the threshold of the pion pair production specific for the so-called ABC effect. The invariant mass of the dππ system in this enhancement region exhibits a resonance-like peak at Mdππ=2.37 GeV/c2 with the width Γ ≈ 0.10 GeV/c2, corresponding to the position of the d’(2370) two-baryon resonance. A possible interpretation of these features is discussed.

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