Diffraction and Low-x 2026

Contribution List

6. Registration

06/09/2026, 17:00

7. Welcome

Prof. ALESSANDRO PAPA (Università della Calabria & INFN-Cosenza), Christophe Royon (The University of Kansas (US)), Dr Georgios Krintiras (The University of Kansas (US))

07/09/2026, 08:45

8. Workshop conclusion

Prof. ALESSANDRO PAPA (Università della Calabria & INFN-Cosenza), Christophe Royon (The University of Kansas (US)), Dr Georgios Krintiras (The University of Kansas (US))

11/09/2026, 18:30

3. Entanglement in low-x QCD scattering

Yair Mulian

We investigate the role of quantum entanglement in scattering processes relevant to the low-x regime of QCD, where high parton densities and multiple interactions dominate the dynamics. Treating the incoming projectile as an entangled multiparton state, we analyze how low-x evolution and scattering off dense gluonic targets modify quantum correlations among partons. Using an...

5. Geometric Scaling and Centrality at the EIC

Rojae Mighty

Understanding the structure of protons and nuclei in terms of quarks and gluons is one of the key goals in science. Results from RHIC suggest the existence of a new state of matter known as gluon saturation. The idea is, at high energies, gluons, due to their self-interactions multiply rapidly; however, when their density becomes very large, recombination effects set in, leading to saturation...

15. Gluon saturation effects in exclusive heavy vector meson and charm, beauty photoproductionio

We study exclusive J/ψ and Υ photoproduction for proton and Pb targets in the high-energy limit, with the energy dependence computed using the linear Balitsky–Fadin–Kuraev–Lipatov and the nonlinear Balitsky–Kovchegov evolution equations. We find that for proton targets there is no difference between the two approaches at the energies of the currently available data, while for Pb targets in J/ψ...

1. LHCspin – a polarized gas target at LHC

Barbara Lopes Pereira (INFN e Laboratori Nazionali di Frascati (IT))

LHCspin is an LHCb R&D project that aims to install a polarized gaseous target in the LHCb spectrometer for Run 5, providing access to spin physics at unprecedented energies that no current fixed-target experiment has reached before.
The forward geometry of the LHCb spectrometer (2 < η < 5) is particularly well suited for the reconstruction of particles produced in fixed-target collisions. In...

9. New HELL results on small-x resummation

Marco Bonvini (INFN, Rome 1 Unit)

I will present recent developments in the resummation of small-x logarithms in DGLAP evolution and in the computation of partonic coefficient functions, as implemented in the HELL public code. I will discuss phenomenological implications and future plans.

10. On the Two R-Factors in the Small-x Shockwave Formalism

M. Gabriel Santiago (Temple University)

There are two $R$-factors frequently used in the phenomenology of exclusive processes at small values of the Bjorken $x$ variable. One $R$-factor takes into account the effects of non-zero longitudinal momentum transfer, which is assumed to be zero in the dipole scattering amplitude. Another $R$-factor accounts for the real part of the elastic scattering amplitude which is often neglected,...

17. PDFs at Approximate N3LO: Status and Importance

I will give an overview of the status of PDFs at approximate N3LO, comparing the different results and approaches. I will then demonstrate their importance for precision LHC phenomenology.

2. Small-x resummation of photon impact factors and virtual photon scattering at high energies

Dimitri Colferai

We perform the renormalization group improved collinear resummation of the
photon-gluon impact factors. We construct the resummed cross section for virtual photon-
photon (γ∗γ∗) scattering which incorporates the impact factors and BFKL gluon Green’s
function up to the next-to-leading logarithmic accuracy in energy. The impact factors include
important kinematical effects which are...

4. Study of the flow effects at LHCb

Marcin Kucharczyk (Polish Academy of Sciences (PL))

The particle correlations constitute an important tool for investigating quantum chromodynamics in hadronic collisions. In small collision systems like ptoton-proton or proton-ion, such correlations may indicate the presence of final-state interactions or possible initial-state correlations. In heavy-ion interactions, azimuthal angular correlations provide insight into collective effects...

16. Theoretical Uncertainties on the determination of the strong coupling from Z pT

I will analyse the theoretical uncertainties inherent in the determination of the strong coupling from the transverse momentum (pT) spectrum of the Z boson. Such analyses require fine control of percent-level theoretical effects in small pT region, not only in terms of their magnitude but also of their shape and that of the corresponding theoretical uncertainties. I will focus on the...