Photoproduction of the scalar mesons f 0 (500) and f 0 (980) off the nucleon

Lee, Je-Hee (Department of Physics, Inha University, Incheon 22212, Republic of Korea) (RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, 351-0115 Saitama, Japan) ; Kim, Hyun-Chul (Department of Physics, Inha University, Incheon 22212, Republic of Korea) (School of Physics, Korea Institute for Advanced Study (KIAS), Seoul 02455, Republic of Korea) ; Kim, Sang-Ho (Asia Pacific Center for Theoretical Physics (APCTP), Pohang 37673, Republic of Korea) ; Ryu, Hui-Young (Department of Physics, Pusan National University, Busan 46241, Republic of Korea) ; Yu, Byung-Geel (Research Institute for Basic Sciences, Korea Aerospace University, Goyang 10540, Republic of Korea)

27 September 2017

Abstract: We investigate photoproduction of scalar mesons off the nucleon, using the effective Lagrangians and the Regge approach. We first study photoproduction, replacing the Feynman propagator with Regge ones for -meson exchange in the channel. The model parameters are fixed by reproducing the experimental data on the differential cross section. We then apply the same method to or photoproduction with the same parameters for the Regge propagator. Since the threshold energy of the production is rather low, resonances, which can decay into a nucleon and two pions in the isoscalar and scalar states, can come into play in the channel. To examine the effects of the resonances, we set up two models to look into the respective contribution of the resonances. We find that, in particular, and play important roles in photoproduction. We discuss the physical implications of the present results.

Published in: PTEP 2017 (2017) 093D05
Published by: Oxford University Press/Physical Society of Japan
DOI: 10.1093/ptep/ptx113
arXiv: 1608.01508
License: CC-BY-3.0

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