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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Hadron Structure and Spectroscopy II
HK 8.4: Vortrag
Montag, 26. Februar 2018, 17:30–17:45, HZO 50
The η′-nucleus potential at low meson momenta* — •Mariana Nanova and Volker Metag for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen
The production of η′-mesons in coincidence with forward-going protons has been studied in photon induced reactions on 12C and on a LH2 target for incoming photon energies of 1.3-2.6 GeV at the electron accelerator ELSA. Under these kinematic constraints the η′ mesons are produced with relatively low kinetic energy (≈ 150 MeV) since the coincident protons take over most of the momentum of the incident photon beam. For the C-target this allows the determination of the real part of the η′-carbon potential at low meson momenta by comparing with collision model calculations of the η′ kinetic energy distribution and excitation function. The present measurement extends earlier determinations of the η′-nucleus potential at higher average momenta towards the production threshold. A comparison of the data with calculations by E. Paryev [1] indicates that also at low momenta deep η′-nucleus potentials of ≥ 100 MeV can be excluded. The LH2 data, taken as a reference to check the data analysis and the model calculations, provide differential and integral cross sections in good agreement with previous results for η′ and η photoproduction off the free proton.
[1] E. Ya. Paryev, J. Phys. G 43 (2016) 015106
*Supported by DFG through SFB/TR16.