Semiexclusive production of J/ψ mesons in proton–proton collisions with electromagnetic and diffractive dissociation of one of the protons

摘要

We calculate the cross sections for both electromagnetic and diffractive dissociation of protons for the semiexclusive production of J / ψ mesons in proton–proton collisions at the LHC. Several differential distributions in missing mass ( M X ), or single-particle variables related exclusively to the J / ψ meson are calculated for s = 7 and 13 ?TeV . The cross sections and distributions are compared to the cross section of the purely exclusive reaction p p → p p J / ψ . We show the corresponding ratio as a function of J / ψ meson rapidity. We compare the distributions for purely electromagnetic and purely diffractive proton excitations/dissociation. We predict cross sections for electromagnetic and diffractive excitations of similar order of magnitude.