Longitudinal correlations from fluctuating strings in Pb-Pb, p -Pb, and p -p collisions

In a framework of a semianalytic model with longitudinally extended strings of fluctuating endpoints, we demonstrate that the rapidity spectra and two-particle correlations in collisions of Pb-Pb, p -Pb, and p -p at the energies of the Large Hadron Collider can be universally reproduced. In our approach, the strings are pulled by wounded constituents appearing in the Glauber modeling at the partonic level. The obtained rapidity profile for the emission of hadrons from a string yields bounds for the distributions of the endpoint fluctuations. Then, limits for the two-particle correlations in pseudorapidity can be obtained. Our results are favorably compared to recent experimental data from the ATLAS Collaboration.