Analysis and implications of precision near-forward TOTEM data

Abstract

Very precise data on elastic proton-proton scattering at $\sqrt{s}=7$, $8$ and $13$ TeV have been obtained by the TOTEM group at LHC in the near-forward region (momentum transfers down to $|t|=6\times 10^{-4}{\mathrm{GeV}}^2$ at $\sqrt{s}=8$ TeV and to $|t|=8\times 10^{-4}{\mathrm{GeV}}^2$ at $\sqrt{s}=13$ TeV). The Coulomb-nuclear interference has been measured with sufficient accuracy for TOTEM to establish the falloff of the $\rho$ parameter with increasing energy. The predictions from a previously studied model are shown to be in good agreement with the data and thus allow us to draw rather firm conclusions about the structure of the near-forward nuclear amplitude. We point out that due to a zero in the real part of the nuclear amplitude occurring at a very small momentum transfer--that can migrate into the Coulomb-nuclear interference (CNI) region at higher energies--much care is needed in extracting the numerical value of $\rho$ for such energies. Thus, the true value of $\rho$ would be higher than the TOTEM value for $\rho$ found under the hypothesis that the real part of the elastic nuclear amplitude is devoid of such a zero in the CNI region.

10 pages and 9 figures

References in corpus (8)

• Measurement of Elastic pp Scattering at $\sqrt{s}$ = 8 TeV in the Coulomb-Nuclear Interference Region - Determination of the $\rho$-Parameter and the Total Cross-Section
• Hadronic forward scattering: Predictions for the Large Hadron Collider and cosmic rays
• Did TOTEM experiment discover the Odderon?
• Black disk, maximal Odderon and unitarity
• CGC/saturation approach: secondary Reggeons and $\rho =Re/Im$ dependence on energy
• Shape of Proton and the Pion Cloud
• Elastic amplitudes studied with the LHC measurements at 7 and 8 TeV
• Energy dependence of slope parameter in elastic nucleon-nucleon scattering

Cited by in corpus (12)

• Evidence of Odderon-exchange from scaling properties of elastic scattering at TeV energies
• Glueballs as the Ithaca of meson spectroscopy
• Spin-dependent Pomeron and Odderon in elastic proton-proton scattering
• Observation of Odderon Effects at LHC energies -- A Real Extended Bialas-Bzdak Model Study
• Coulomb-Nuclear Interference: Theory and Practice for pp-Scattering at 13 TeV
• Soft-photon radiation in high-energy proton-proton collisions within the tensor-Pomeron approach: Bremsstrahlung
• Anomaly in the differential cross sections at 13 TeV
• Analytical representation for amplitudes and differential cross section of pp elastic scattering at 13 TeV
• pp elastic scattering at ISR and LHC energies
• Model-independent Odderon results based on new TOTEM data on elastic pp collisions at 8 TeV
• Some applications of the Eikonal model with Coulomb and curvature corrections in $pp$ and $\bar{p}p$ scattering
• Soft Pomeron in light of the LHC correlated data