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We consider contributions of the open-string singlet~(OSS) interaction to theproton-proton scattering. Modelling baryon and meson as instanton and openstring in the effective QCD string model, the typical pomeron is identifiedwith a massive spin-2 closed string. According to the open-closed stringduality, the massive spin-2 closed string is accompanied by the open-stringsinglet interaction with universal coupling. The flat space 4-point open-stringsinglet amplitudes and cross sections are computed in the Regge limit.Including both the open and closed string pomerons, we fit the differentialcross-section with experimental data of the proton-proton and proton-antiprotonscattering from the CDF, E-710, D0, LHC-ATLAS and LHC-TOTEM collaborations. Thefitting results show the universality of the string mass scale~(or stringtension) and consistency of the string model between the open and closed stringparameters in describing the $pp$ and $p\bar{p}$ scattering in the Regge limit.The fitting of the string model to experimental data gives the string scale$M_{S}\simeq 1.7-1.8$ GeV and the corresponding glueball pole mass $m_{g}\simeq1.6-1.7$ GeV. This lies within experimental values of the observed $2^{++},I=0$ "meson" masses.

Open-string singlet interaction as pomeron in elastic $pp, p\bar{p}$ scattering