arXiv subjects

T. V. Iser

Publications and source records attributed to T. V. Iser.

3 recordsLinked to original sources

arXiv2026

Unitarity dressing of the dynamical gluon mass scale

We study the effect of $s$-channel unitarity on the dynamical gluon mass scale, $m_g$, extracted from high-energy elastic $pp$ scattering. The elementary input is a Reggeized Landshoff--Nachtmann two-gluon exchange, in which the soft Pomeron is represented by a color-singlet pair of dynamically massive gluons. At Born level, the logarithmic and power-law mass solutions give $m_g=299$--$422~\MeV$, in the usual phenomenological range. When the same input is embedded in the eikonal and $U$-matrix schemes, the preferred values move to $m_g=749$--$1101~\MeV$. The enhancement, by a factor close to $2.5$, is stable against the ATLAS--TOTEM data choice, the running of the gluon mass, and the unitarization prescription. We trace this shift to the nonlinear mapping between the elementary two-gluon kernel and the physical impact-parameter profile. The scale inferred from elastic scattering is therefore a unitarity-dressed infrared scale, fixed jointly by the nonperturbative gluon propagator and by multiple-exchange dynamics.

hep-ph↗

arXiv2025

Semihard interactions at TeV energies

We investigate the high-energy behavior of the total cross section, $σ_{\text{tot}}$, and the ratio of the real to imaginary parts of the scattering amplitude, $ρ$, in both proton-proton and antiproton-proton channels. Our analysis is based on a QCD-inspired model in which the rise of the cross sections is predominantly driven by semihard processes involving gluons. We address the tension between measurements from the ATLAS/ALFA and TOTEM Collaborations, showing that independent analyses of their datasets can provide statistically consistent descriptions of the overall data, even though they do not fully reproduce the central values of the $ρ$ parameter at $\sqrt{s} = 13$ TeV. The slight discrepancy between these central values and the model's predicted values, obtained using an asymptotic dominant crossing-even elastic scattering amplitude, points to the potential presence of an odd component in the semihard amplitude at high energies.

hep-ph↗

arXiv2025

Semihard interactions at high energies

We revisit a minijet model to examine the behavior of the total cross section, $σ_{tot}$, and the ratio of the real to imaginary parts of the scattering amplitude, $ρ$, at high energies. In this framework, the growth of $σ_{tot}$ in $pp$ and $\bar{p}p$ channels is driven by semihard partonic processes dominated by gluon interactions. The QCD contribution to $σ_{tot}$ for the jet production is computed in the next-to-leading order. We analyze data separately from the TOTEM and ATLAS/ALFA Collaborations and find evidence in both cases suggesting the necessity of an odd semihard component that becomes asymptotically significant at high energies.

hep-ph↗