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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Hadron Structure and Spectroscopy V

HK 35.4: Vortrag

Dienstag, 12. März 2024, 18:30–18:45, HBR 62: EG 19

Investigation of the coherent γ d → 3 π⁰ d photoproduction for hints of dibaryon states — •Richard Volk for the BGOOD collaboration — Physikalisches Institut, Universität Bonn

The existence of dibaryon states beyond the deuteron was proposed shortly after the development of the quark model. The recently discovered d^*(2380) in the non-strange sector is a candidate and can possibly be accessed via coherent meson photoproduction off a deuteron, such as γ d → 2 π⁰ d or γ d → 3 π⁰ d.

The γ d → 3 π⁰ d channel was measured using the BGOOD photoproduction experiment at ELSA. BGOOD is comprised of a central calorimeter for neutral particle reconstruction and complemented by a magnetic spectrometer in forward directions for charged particle identification.

The γ d → 3 π⁰ d coherent reaction could be sensitive to intermediate isovector & isoscalar dibaryon candidates. If present, this may be most apparent at forward angles where conventional coherent reaction mechanisms are suppressed due to the large momentum transfer to the deuteron. Using data from BGOOD the reaction is reconstructed using identification techniques for the deuteron in the forward spectrometer and π⁰ decays in the central calorimeter.

Supported by DFG projects 388979758/405882627 and the European Union’s Horizon 2020 programme, grant 824093.

Keywords: BGOOD; Dibaryon; Coherent photoproduction; Exotic quark states