Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadron Structure and Spectroscopy V

HK 38.6: Talk

Thursday, March 30, 2017, 15:30–15:45, F 5

Determination of the η^′-nucleus potential at low momenta* — Mariana Nanova and •Volker Metag for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen

The real part of the η^′-nucleus potential has been determined at low momenta by analyzing the η^′ kinetic energy distribution and the excitation function in photoproduction of of η^′ mesons off C in coincidence with forward going protons. The forward going protons take over most of the momentum of the incoming photon beam and thus allow a study of the η^′-nucleus interaction at very low energies. This experimental approach was previously used in the determination of the ω -nucleus potential at low momenta [1]. The present measurement extends earlier determinations of the η^′ -nucleus potential at higher average momenta [2,3] towards the production threshold. A comparison of the data with calculations by E. Paryev [4] indicates that also at low momenta deep η^′ - nucleus potentials of ≥ 100 MeV, predicted in [5], can be excluded, in agreeement with [6].
S. Friedrich et al., Phys. Lett. B 87 (2013) 045201
M. Nanova et al., Phys. Lett. B 727 (2013) 417
M. Nanova et al., Phys. Rev. C 94 (2016) 025205
E. Paryev, J. Phys. G 43 (2016) 015106
H. Nagahiro et al., Phys. Rev. C 74 (2006) 045203
Y. Tanaka et al., Phys. Rev. Lett. 117 (2016) 202501
^∗Supported by DFG through SFB/TR16.