1303.5198 (M. N. Achasov et al.)

Study of e+e- --> omega pi0 --> pi0 pi0 gamma in the energy range
1.05--2.00 GeV with SND    [PDF]

M. N. Achasov, V. M. Aulchenko, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, K. A. Grevtsov, L. V. Kardapoltsev, A. G. Kharlamov, D. P. Kovrizhin, I. A. Koop, A. A. Korol, S. V. Koshuba, A. P. Lysenko, K. A. Martin, I. N. Nesterenko, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, A. L. Romanov, S. I. Serednyakov, Z. K. Silagadze, K. Yu. Skovpen, A. N. Skrinsky, I. K. Surin, Yu. A. Tikhonov, A. V. Vasiljev, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol, A. L. Romanov, I. M. Zemlyansky

The cross section for the process e+e- --> omega pi0 --> pi0 pi0 gamma has been measured in the energy range 1.05--2.00 GeV. The experiment has been performed at the e+e- collider VEPP-2000 with the SND detector. The measured e+e- --> omega pi0 cross section above 1.4 GeV is the most accurate to date. Below 1.4 GeV our data are in good agreement with the previous SND and CMD-2 measurements. Data on the e+e- --> omega pi0 cross section are well described by the VMD model with two excited rho-like states. From the measured cross section we have extracted the gamma^* --> omega pi0 transition form factor. It has been found that the VDM model cannot describe simultaneously our data and data obtained from the omega --> pi0 mu+ mu- decay. We have also tested CVC hypothesis comparing our results on the e+e- --> omega pi0 cross section with data on the tau- --> omega pi- nu_{tau} decay.

View original: http://arxiv.org/abs/1303.5198