Hadronic cross-section fluctuations

Accessing transverse nucleon and gluon distributions in heavy nuclei using coherent vector meson photoproduction at high energies in ion ultraperipheral collisions

“…In Ref. [8], this was realized using the Good-Walker formalism of cross section fluctuations [25,26] by introducing the distribution P V (σ) giving the probability for the photon to interact with a nucleon target with the cross section σ. Note that in addition to significant inelastic nuclear shadowing, the cross section fluctuations result in the reduction of the effective ρ meson-nucleon cross section probed in the γp → ρp process compared to the additive quark model estimate.…”

Emulsion chamber observations of Centauros, aligned events and the long-flying component

“…The origin of cross-section fluctuations (CSF) is traced down to the fact that hadrons have internal degrees of freedom (colour-carrying quarks and gluons) and can thus collide in different internal configurations resulting in different cross sections. Interested readers are referred to [42] for details and a physical justification of this phenomenon. Fluctuations of hadronic cross sections are discussed in the literature and observed in diffraction dissociation experiments at accelerators [42,43].…”

“…Interested readers are referred to [42] for details and a physical justification of this phenomenon. Fluctuations of hadronic cross sections are discussed in the literature and observed in diffraction dissociation experiments at accelerators [42,43]. Subsequently, the so called Tsallis statistics [44][45][46][47][48] were used to increase the predictive power of the usual statistical approaches.…”

Multiplicity structure of the hadronic final state in diffractive deep-inelastic scattering at HERA

“…Specifically, whereas the total γ * p cross section measures the average absorption strength, the magnitude of the diffractive cross section, on the other hand, is related to its fluctuations [19,20]. The diffractively produced hadronic final states are therefore expected to carry information, not only on the parton composition of the virtual photon wavefunction components and their interaction with the target, but also on their respective contributions to the diffractive cross section.…”

“…Diffraction in general [18], and dissociation of the photon in particular, arises from the fact that the strength of absorption of the various Fock-states depends on the internal degrees of freedom and quark-gluon composition of the dissociating object [19][20][21]. Specifically, whereas the total γ * p cross section measures the average absorption strength, the magnitude of the diffractive cross section, on the other hand, is related to its fluctuations [19,20].…”