Role of $\sigma$ exchange in the $\gamma p\to \varphi p$ process and scaling with the $f_1$ axial vector meson from a Reggeized model

Abstract

We investigate the role driven by the scalar meson $\sigma$ exchange in the photoproduction of the vector meson $\varphi$(1020) off a proton by using a Reggeized model. Based on the ${\pi }^0(135)+\sigma (500)+f_2(1270)$+Pomeron exchanges, we demonstrate that the $\sigma$ exchange plays the role to reproduce the bump structure at the forward angle in the differential cross section as well as the peaking behavior in the total cross section observed in the CLAS Collaboration. We also discuss the possible observation of the scaled cross section $s^{7}d\sigma /dt$ at the production angle $\theta =90^{\circ }$ from the CLAS data. It is found that the axial vector meson $f_1(1285)$ exchange with the trajectory ${\alpha }_{f_1}(t)=0.028t+0.9\pm 0.2$ arising from the axial anomaly of the QCD vacuum plays the role to clarify the scaling up to 5 GeV.

5 pages, 5 figures, 1 table

References in corpus (6)

• Diffractive $\varphi$-meson photoproduction on proton near threshold
• Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$
• Evidence for the tensor meson exchange in the kaon photoproduction
• The nucleon-sigma coupling constant in QCD Sum Rules
• Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules
• Role of $\omega$-meson exchange in scaling of the $\gamma p\to {\pi }^{0}p$ process from a Regge-type model with resonances

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• Features of $\omega$ photoproduction off nucleon target at forward angles : Dominance of $\pi$ exchange with Regge cuts and scaling of differential cross sections
• Features of forward $\pi N$ scattering from a Reggeized model
• Features of $\omega$ photoproduction off proton target at backward angles : Role of nucleon Reggeon in $u$-channel with parton contributions
• Photoproductions of $f_1(1285)$ and ${\eta }^{\prime }(958)$ from the analysis of CLAS data with the Primakoff effect at high energies
• A new combined analysis of elastic and charge exchange $KN(\bar{K}N)$ scatterings in the Regge realm