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 pd → pdππ with the intermediate two-baryon-resonance excitation — Vladimir Komarov¹, Tatyana Azaryan¹, Sergey Dymov^1,2, and •Dmitry Tsirkov¹ — ¹Laboratory 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 pd→ pd+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 M_x 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 M_dππ=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.