The η'-carbon potential at low meson momenta

Abstract

The production of ${\eta }^{\prime }$ 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 ${\eta }^{\prime }$ mesons have been identified via the ${\eta }^{\prime }\to {\pi }^0{\pi }^0\eta \to 6\gamma$ decay registered with the CBELSA/TAPS detector system. Coincident protons have been identified in the MiniTAPS BaF${}_2$ array at polar angles of $2^{\circ }\le {\theta }_p\le 11^{\circ }$. Under these kinematic constraints the ${\eta }^{\prime }$ mesons are produced with relatively low kinetic energy ($\approx$ 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 ${\eta }^{\prime }$-carbon potential at low meson momenta by comparing with collision model calculations of the ${\eta }^{\prime }$ kinetic energy distribution and excitation function. Fitting the latter data for ${\eta }^{\prime }$ mesons going backwards in the center-of-mass system yields a potential depth of V = $-$(44 $\pm$ 16(stat)$\pm$15(syst)) MeV, consistent with earlier determinations of the potential depth in inclusive measurements for average ${\eta }^{\prime }$ momenta of $\approx$ 1.1 GeV/$c$. Within the experimental uncertainties, there is no indication of a momentum dependence of the ${\eta }^{\prime }$-carbon potential. The LH${}_2$ 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 ${\eta }^{\prime }$ photoproduction off the free proton.

9 pages, 13 figures. arXiv admin note: text overlap with arXiv:1608.06074

References in corpus (9)

• In-medium nuclear interactions of low-energy hadrons
• Meson-nucleus potentials and the search for meson-nucleus bound states
• η- and η'-mesic nuclei and U_A(1) anomaly at finite density
• Interaction of vector mesons with baryons and nuclei
• Formation of eta-prime(958)-mesic nuclei by (p,d) reaction
• Measurement of excitation spectra in the ${}^{12}$C$(p,d)$ reaction near the ${\eta }^{\prime }$ emission threshold
• Determination of the real part of the η'-Nb optical potential
• Momentum dependence of the imaginary part of the $\omega$- and ${\eta }^{\prime }$-nucleus optical potential
• Experimental constraints on the $\omega$-nucleus real potential

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