Event calendar file
Triangular singularity in the reaction $\gamma p \rightarrow p \pi^0 \eta$.$^\star$
Speakers
- Volker METAG
Primary authors
- Volker METAG (II.Physikalisches Institut, Universität Giessen)
Co-authors
- Dr. Mariana NANOVA (University of Giessen, Germany)
Collaboration
CBELSA/TAPS
Abstract content
It is shown that a triangular singularity [1-4] occurs in the reaction $\gamma p \rightarrow p \pi^0 \eta$ at incident photon energies in the range of 1300 - 1550 MeV. A $\Delta^*$ resonance populated in the reaction decays into an $\eta$ and the $\Delta (1232)$ resonance which subsequently decays into a proton and a $\pi^0$. If the $\pi^0$ is emitted collinear with the $\eta$ meson it catches up with the $\eta$ meson and rescatters. Experimental evidence for this process is discussed based on recent data on the $\gamma p \rightarrow p \pi^0 \eta$ reaction obtained by the CBELSA/TAPS collaboration.
[1] C. Schmid, Phys. Rev. 154 (1967) 1363.
[2] M. Mikhasenko, B. Ketzer, A. Sarantsev, Phys. Rev. D 91 (2015) 094015.
[3] M. Bayar et al., Phys. Rev. D 94 (2016) 074039.
[4] V. R. Debastiani, S. Sakai, E. Oset, Phys. Rev. C 96 (2017) 025201.
$^\star$Funded by DFG(SFB/TR-16)
