Nucleon resonance production in the γp→pηϕ reaction

Abstract

In this work, we perform a study of nucleon resonance production in the γp → pηφ reaction within an effective Lagrangian approach. In our model, we consider the excitation of the N * (1535), N * (1650), N * (1710) and N * (1720) in the intermediate state and the background term. We find that this reaction is dominated by the excitation of the N * (1535) in the near threshold region. Especially, we study the possible role of the scalar meson exchange in this reaction. It is found that the f0(980) exchange may give a significant contribution and the parity asymmetry can be used to identify its role in this reaction.PACS numbers:

The $ϕ(2170)$ production in the process $γp\to ηϕp$

“…Very recently, the reaction of γp → ηφp is also suggested to study the nucleon resonances production in Ref. 13 where the total cross section at E γ = 3.8 GeV is around 8 ∼ 10 nb, which is consistent with our prediction.…”

ϕ(2170) production in the process γp→ηϕp

“…Very recently, the reaction of γp → ηφp is also suggested to study the nucleon resonances production in Ref. [44] where the total cross section at E γ = 3.8 GeV is around 8 ∼ 10 nb, which is consistent with our prediction.…”

“…Our calculations show that there will be a peak, at least a bump structure around 2180 MeV in the ηφ mass distribution of γp → φηp reaction, the The magnitude of our total cross section is consistent with the prediction of Ref. [44] where the same reaction is used to study the nucleon resonances. We suggest our experimental colleagues to search for the resonance φ(2170) in the γp → ηφp reaction, which would be helpful to shed light on its nature.…”

“…For the intermediate nucleon excited resonances, we only take into account the contribution of the resonances N (1535), since the ηp production from the intermediate resonance N (1535) plays the dominant role near the threshold, as discussed in Refs. [41,44] where more nucleon excited resonances were considered. We also need the interaction Lagrangian densities involving N (1535) (marked as N * ) [45],…”