English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We use information about DIS and $J/ \psi$ production on hydrogen to modelthe $t$-dependence of the $\gamma^{\ast} N$ scattering amplitude. Weinvestigate the profile function for elastic scattering of hadronic componentsof the virtual photon off both a nucleon and heavy nuclear target, and weestimate the value of the impact parameter where the black body limit isreached. We also estimate the fraction of the cross section that is due tohadronic configurations in the virtual photon wave function that approach theunitarity limit. We extract, from these considerations, approximate lowerlimits on the values of $x$ where the leading twist approximation in DIS isviolated. We observe that the black body limit may be approached within HERAkinematics with $Q^{2}$ equal to a few GeV$^2$ and $x \sim 10^{-4}$.Comparisons are made with earlier predictions by Munier {\it et al.}, and thelongitudinal structure function is compared with preliminary HERA data. Theprinciple advantage of our method is that we do not rely solely on the$t$-dependence of $\rho$-meson production data. This allows us to extend ouranalysis down to very small impact parameters and dipole sizes. Finally, weperform a similar calculation with a $^{208}$Pb target, and we demonstrate thatthe black body limit is already approached at $Q^{2} \sim 20$ GeV$^{2}$ and $x\sim 10^{-4}$.Comment: Calculations for x = 10^-5 are added. Discussions are elaborated. A  small correction is made to figure 11. The conclusions remain unchange

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Determining the proximity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mi>N</mml:mi></mml:math>scattering to the black body limit using deep inelastic scattering and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>production

Determining the proximity ofγ*Nscattering to the black body limit using deep inelastic scattering andJ/ψproduction