Guangxi Univ Technol, Dept Informat & Comp Sci, Liuzhou 545006, Peoples R China
; Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The Pomeron-nucleon coupling vertex is theoretically derived from the fundamental theory of strong interaction QCD. The empirical vertex beta gamma(mu)F(1) (t) used commonly in diffractive processes with a coupling strength beta = 6.0 GeV-1 is initially obtained from QCD theoretically. Our study not only reproduces the Pomeron-nucleon coupling from QCD but also clearly shows the gluonic origin and glueball nature of Pomeron, which is a longstanding puzzle. From this investigation, we claim that Pomeron can be regarded as a Reggeized tensor glueball (2230) with quantum numbers of I(G)J(PC) = 0(+)2(++). Since the tensor glueball xi(2230) lies on the Pomeron trajectory alpha(p)(t = M-xi(2)) = 2, the longstanding puzzle that no physical particle lies on the Pomeron trajectory, alpha(p)(t) = 1.08 + 0.20 GeV-2 (.) t, seems to be solved.