Gravitational formfactors of the ρ , π , and K mesons in the light-cone QCD sum rules

By using the quark part of the energy-momentum tensor current, the gravitational formfactors of the ρ, π, and K mesons are calculated within the light-cone sum rules method. In the considered version, the energy-momentum tensor current is not conserved and as a result, for integer spin J, there appear 4J + 2(2J + 1) formfactors, which correspond to the conservation (nonconservation) of the energy-momentum tensor current. The average mass radius of ρ, π, and K mesons as well as the gravitational quadrupole moment of the ρ meson are calculated. We also compare our results with the one existing in the literature on these quantities.