Proton-proton forward scattering at the LHC

Abstract

Recently the TOTEM experiment at the LHC has released measurements at $\sqrt{s}=13$ TeV of the proton-proton total cross section, ${\sigma }_{tot}$, and the ratio of the real to imaginary parts of the forward elastic amplitude, $\rho$. Since then an intense debate on the $C$-parity asymptotic nature of the scattering amplitude was initiated. We examine the proton-proton and the antiproton-proton forward data above 10 GeV in the context of an eikonal QCD-based model, where nonperturbative effects are readily included via a QCD effective charge. We show that, despite an overall satisfactory description of the forward data is obtained by a model in which the scattering amplitude is dominated by only crossing-even elastic terms, there is evidence that the introduction of a crossing-odd term may improve the agreement with the measurements of $\rho$ at $\sqrt{s}=13$ TeV. In the Regge language the dominant even(odd)-under-crossing object is the so called Pomeron (Odderon).

5 pages, 2 figures, 1 table. Phenomenological approach revised, results and conclusions changed, suggesting now the presence of Odderon effects in forward scattering (once confirmed the TOTEM data at 13 TeV)

References in corpus (25)

• Lattice gluodynamics computation of Landau-gauge Green's functions in the deep infrared
• Constraints on the IR behavior of the gluon propagator in Yang-Mills theories
• Measurement of the proton-air cross-section at $\sqrt{s}=57$ TeV with the Pierre Auger Observatory
• Measurement of the total cross section from elastic scattering in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the total cross section from elastic scattering in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Uniqueness of infrared asymptotics in Landau gauge Yang-Mills theory
• Did TOTEM experiment discover the Odderon?
• Black disk, maximal Odderon and unitarity
• Elastic and diffractive scattering at the LHC
• Elastic proton-proton scattering at 13 TeV
• Hollowness in $pp$ and $p\bar{p}$ scattering in a Regge model
• Diffractive dissociation re-visited for predictions at the LHC
• Evidence of ghost suppression in gluon mass dynamics
• Odderon and proton substructure from a model-independent Levy imaging of elastic $pp$ and $p\bar{p}$ collisions
• Evidence for maximality of strong interactions from LHC forward data
• Towards a complete study of central exclusive production of $K^{+}{K}^{-}$ pairs in proton-proton collisions within the tensor Pomeron approach
• QCD effective charge and the structure function $F_2$ at small-$x$
• Survival probability of large rapidity gaps in a QCD model with a dynamical infrared mass scale
• Soft Pomerons and the Forward LHC Data
• $\gamma p$ and $\gamma \gamma$ scattering from $\bar{p}p$, $pp$ forward amplitudes in a QCD eikonal model with a dynamical gluon mass
• CGC/saturation approach: secondary Reggeons and $\rho =Re/Im$ dependence on energy
• Forward Elastic Scattering and Pomeron Models
• t dependence of the slope of the high energy elastic pp cross section
• The possibility that the triple-Pomeron coupling vanishes at q_t=0
• Inelastic cross-section and Survival Probabilities at LHC in mini-jet models

Cited by in corpus (6)

• QCD effective charges and the structure function $F_2$ at small-$x$: Higher twist effects
• Determination of the entanglement entropy in elastic scattering using model-independent method for hadron femtoscopy
• A model of diffractive excitation in $pp$ collisions at high energies
• Soft diffraction within the QCD color dipole picture
• Nonperturbative gluon exchange in $pp$ elastic scattering at TeV energies
• Soft Pomeron in light of the LHC correlated data