SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Hadron Structure and Spectroscopy I
HK 4.1: Gruppenbericht
Montag, 30. August 2021, 16:30–17:00, H3
Observation of a structure in the M(pη) invariant mass distribution at 1700 MeV in the γp - p πη reaction — •Volker Metag and Mariana Nanova for the CBELSA/TAPS collaboration — II. Physikalisches Institut Universität Giessen
The present work extends earlier studies of the γ p → p π0 η reaction and has been motivated by the recently claimed observation of a narrow structure around an excitation energy of 1678 MeV [1]. The existence of this structure cannot be confirmed. Instead, for Eγ = 1400 - 1500 MeV and the cut Mpπ0 ≤ 1190 MeV a statistically significant structure in the Mpη invariant mass distribution near 1700 MeV is observed with a width of Γ≈ 35 MeV.The most likely interpretation is that it is due to a triangular singularity in the γ p → p a0 → p π0 η reaction.
[1] V. Kuznetsov et al., JETP Lett. 106, 693 (2017).
∗Supported by DFG through SFB/TR16.