The structure of the pion at large Nc

We compute the pion quark momentum fraction in the large-Nc limit using the Twisted Eguchi-Kawai (TEK) reduced model. Gauge configurations for different values of the lattice spacing are generated with the pure-gauge TEK action, while the pion correlators are computed for different quark masses with maximally twisted mass fermions. The bare matrix element corresponding to the quark momentum fraction is obtained using the Feynman-Hellmann method, and we use perturbative renormalization factors to connect to the MS̄ scheme at 2\,GeV. A global analysis at several lattice spacings, pion masses, and values of Nc yields xqMS̄(2\,GeV) = 0.267(105) at the physical pion mass in the large-Nc limit. This value is significantly smaller than existing Nc=3 determinations from phenomenology and lattice QCD, indicating that, in the large-Nc limit, the pion's light-cone momentum is carried predominantly by gluons.