Diffraction and Shadowing PhenomenaNo Access

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

Universidade Federal de Santa Catarina – Campus Blumenau, Rua Pomerode, 710 Salto do Norte, 89065-300 Blumenau, SC, Brazil

E-mail Address: daniel.fagundes@ufsc.br

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L. Jenkovszky

Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, UA-03680 Kiev, Ukraine

E-mail Address: jenk@bitp.kiev.ua

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E. Q. Miranda

InSTEC, Quinta de los Marinos, Ave. Salvador Allende y Lucas, La Habana 10400 Cuba

E-mail Address: equintana@ucf.edu.cu

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G. Pancheri

INFN Frascati National Laboratories, Via E. Fermi 40, 00444, Italy

E-mail Address: Giulia.Pancheri@lnf.infn.it

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P. V. R. G. Silva

Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859, Campinas, SP, Brazil

E-mail Address: precchia@ifi.unicamp.br

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https://doi.org/10.1142/S0217751X16450226Cited by:9 (Source: Crossref)

Abstract

Following earlier findings, we argue that the low- $| t |$ $| t |$ structure in the elastic diffractive cone, recently reported by the TOTEM Collaboration at $8$ $8$ TeV, is a consequence of the threshold singularity required by $t -$ $t -$ channel unitarity, such as revealed earlier at the ISR. By using simple Regge-pole models, we analyze the available data on the $p p$ $p p$ 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 behavior observed at LHC8 is a recurrence of the low- $| t |$ $| t |$ “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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