Author

N. Vasim

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Preprint Sep 2026

Measuring Dual-Superconductor Length Scales in the QCD Vacuum at HERA

In the dual-superconductor picture, the QCD vacuum behaves like a superconductor for chromoelectric fields, with characteristic penetration and coherence lengths. These scales have so far been studied primarily through lattice calculations of static flux tubes. We show that they are also imprinted on exclusive diffract...

T. Toll, N. Vasim · 0 citations

Preprint Jul 2026

Precise Determination of the Proton's Gluon Cloud Geometry from HERA data

The transverse shape of the proton's small-$x$ gluon distribution is determined from exclusive $J/\psi$ photoproduction at HERA. We derive analytic expressions for the coherent and incoherent diffractive cross sections in the hotspot model at leading twist, enabling a global fit to all 104 available H1 and ZEUS data po...

T. Toll, N. Vasim · 0 citations