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The η′-carbon potential at low meson momenta

The production of η′ mesons in coincidence with forward-going protons has been studied in photon-induced reactions on 12 C and on a liquid hydrogen (LH 2 ) target for incoming photon energies of 1.3–2.6 GeV at the electron accelerator ELSA. The η′ mesons have been identified via the η′ → π 0 π 0 η → 6γ decay registered with the CBELSA/TAPS detector system. Coincident protons have been identif