Modification of X(3872) production in high-multiplicity pp collisions at LHCb*

Nearly 20 years after its discovery, the structure of the exotic hadron X(3872) is still not clear. ~Models have considered compact tetraquarks, hadronic molecules, and mixtures of exotic and conventional hadrons with varying levels of agreement with experimental data. ~Interactions of X(3872) hadrons with the dense QCD environment created in high-multiplicity pp collisions and heavy ion collisions offer a new method of probing the structure experimentally. ~Here we will present LHCb results on the relative production of X(3872) and psi(2S) hadrons as a function of charged particle multiplicity in pp collisions at 8 TeV, and discuss how the observed modifications can discriminate between models of exotic hadron structure.