Forward elastic scattering: dynamical gluon mass and semihard interactions

Abstract

In the context of a QCD-based model with even-under-crossing amplitude dominance at highenergies, it is shown that the pp andpp elastic scattering data on σtot and ρ above 10 GeV are quite well described, especially the recent TOTEM data at 13 TeV. Specifically, we investigate the role of low-x parton dynamics in dictating the high-energy behavior of forward scattering observables at LHC energies, by using a nonpertubative cutoff linked to the dynamical generation of a gluon mass. Unexpected features of the data, such as the rather small ρ value at 13 TeV recently reported by the TOTEM Collaboration, are addressed using an eikonalized elastic amplitude, where unitarity and analyticity properties are readily build in. The model provides an accurate global description of σtot and ρ with pre-and post-LHC fine-tuned parton distributions, CTEQ6L and CT14, even if data at 8 and 13 TeV are not included in the dataset analyzed. These findings suggest that the low-x parton dynamics, as well as the nonperturbative dynamics of QCD, play a major role in the driving mechanism behind the pre-asymptotic ρ decrease at LHC energies.

Model of diffractive excitation in pp collisions at high energies

“…Such result indicates that new contributions must be included in the description of the soft part of the eikonal cross section. Similar conclusion have been reached in recent studies performed using e.g.. the DGM model [17]. Our predictions for the transverse momentum dependence of the differential elastic cross section considering a pp collision at √ s = 13 TeV is presented in Fig.…”

“…Moreover, the infrared divergences present in the elementary subprocesses at low transferred momenta will be regularized using the approach proposed in the Refs. [16,17].…”

“…Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]), with reasonable success in the description of the pre -LHC data [18] and the recent very precise data released by the ATLAS and TOTEM Collaborations [19][20][21][22][23][24][25][26]. A comprehensive review of these different approaches for the treatment of the hadronic interactions was performed in Ref.…”

Two-loop corrections to the QCD propagators within the Curci-Ferrari model

“…to low energies similar to those begun in [45,46] for instance where a dynamical gluon mass was used. While there are Dyson-Schwinger analyses of the quark wave function and mass form factors in Ref.…”

Determination of the entanglement entropy in elastic scattering using model-independent method for hadron femtoscopy

“…For instance, the measured value at the LHC by the TOTEM Collaboration at 13 TeV is R el = 0.281 ± 0.009 [21] and the eikonal model gives R eik el = 0.23. On the other hand, one-channel eikonal models based on QCD with nonperturbative effects included through a QCD effective charge are able to successfully describe the LHC data [31,32]. At high energies, Eq.…”