Abstract
In the last years, the proton picture in which the quarks are disposed in the extremities of an ``Y" like gluon string, also called string junction, or baryon junction (BJ), has been intensively investigated. We have implemented the BJ in the Glauber model applied to nucleon-nucleon collisions and we could explain the overgrowth of $J/\psi$ production in ultracentral proton-proton collisi…