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arXiv · 1509.02197

Fine structure of the diffraction cone: from ISR to the LHC

D. A. Fagundes·L. Jenkovszky·E. Q. Miranda·G. Pancheri·P. V. R. G. Silva
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Abstract

Following earlier findings, we argue that the low-$|t|$ structure in the elastic diffractive cone, recently reported by the TOTEM Collaboration at $8$ TeV, is a consequence of the threshold singularity required by $t-$channel unitarity, such as revealed earlier at the ISR. By using simple Regge-pole models, we analyze the available data on the $pp$ elastic differential cross section in a wide range of c.m. energies, namely those from ISR to LHC8, obtaining good fits of all datasets. This study hints at the fact that the non-exponential behaviour observed at LHC8 is a recurrence of the low-$|t|$ "break" phenomenon, observed in the seventies at ISR, being induced by the presence of a two-pion loop singularity in the Pomeron trajectory.

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D. A. Fagundes, L. Jenkovszky, E. Q. Miranda, G. Pancheri, P. V. R. G. Silva. 2015-09-07. Fine structure of the diffraction cone: from ISR to the LHC. https://doi.org/10.1142/9789813141704_0022

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