A model for the Pomeron trajectory

Fine structure of the diffraction cone: Manifestation of t-channel unitarity

“…The new LHC data from TOTEM at 8 TeV confirm the conclusions made [6] about the nature of the break and call for a more detailed analysis of the phenomenon. The new data triggered further theoretical work in this direction [7,8], but many issues still remain open.…”

“…This effect, for bravity called the "break", was confirmed by recent measurements by the TOTEM Collaboration at the CERN LHC, first at 8 TeV [1] and subsequently at 13 TeV [2]. The new LHC data from TOTEM at 8 TeV confirm the conclusions made [6] about the nature of the break and call for a more detailed analysis of the phenomenon. The new data triggered further theoretical work in this direction [7,8], but many issues still remain open.…”

“…Soon after the ISR measurements, the phenomenon was interpreted [6] as manifestation of t-channel unitarity, producing a two-pion loop, as shown in Fig. 1, and resulting in a relevant threshold singularity in the Pomeron trajectory.…”

Rational form of amplitude and its asymptotic factorization

“…To cure the first issue, it has been proposed to consider nonlinear Regge trajectories (see [16] and references therein) based on accounting for the t-channel two-pion loop contribution [17,18]. However, the problem with asymptotical factorization remains.…”