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Entanglement entropy is the physical quantity that measures the degrees of entanglement of a quantum system. There are theoretical models that seek to compute this quantity in order to evaluate its connection with the final entropy measured in particle accelerators at high energies in eP collisions.
In the evaluation of entanglement entropy, it is necessary to evaluate the states that are entangled. One possibility is entanglement between the measured states and the complementary part of the proton in a DIS. In this case, it is possible to establish a connection with the entanglement entropy and the gluon PDF at high energies from the Balitsky-Kovchegov equation (BK). Another available formalism is the entanglement between the wavefunction of the soft gluons and the valence quarks in the Color Glass Condensate (CGC) framework which can be obtained from the coherent wavefunction of the gluons as well as the basis of the particle number operator.
One way to do the phenomenology of these models is from the analytical distributions for the gluon PDF and the use of the saturation scale, both from the Golec-Biernat and Wusthoff (GBW) models. The theoretical models are expanded to the case of collisions with heavy ions with the necessary adaptations.
