Double neutral pion photoproduction off the proton with FOREST at ELPH
1 Research Center for Electron Photon Science, Tohoku University, Sendai 982-0826, Japan
2 Department of Physics, Yamagata University, Yamagata 990-8560, Japan
3 Department of Information Science, Tohoku Gakuin University, Sendai 981-3193, Japan
4 Department of Physics, Tohoku University, Sendai 980-8578, Japan
5 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
6 Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan
a e-mail: firstname.lastname@example.org
Published online: 12 February 2016
Total cross section for the double neutral pion photoproduction off the proton is presented in the incident photon energy range of 0.58 to 1.15 GeV. The data were accumulated in the years 2009–2010, recorded by a 4π EM calorimeter at ELPH, named FOREST. The number of recorded events obtained during this period is 1.6×109 for a hydrogen target. Two neutral pions are reconstructed via detecting their decay products, four gammas (2π0 → 4γ). Compared to the previous results obtained by other groups, our data are in good agreement with theirs within error bars.
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