Hard Exclusive Production of Tensor Mesons
  We point out that hard exclusive production of tensor mesons $f_2(1270)$ with helicity $\lambda=\pm 2$ is dominated by the gluon component in the meson wave function and can be used to determine gluon admixture in tensor mesons in a theoretically clean manner.   We present a detailed analysis of the tensor meson distribution amplitudes and calculate the transition form factor $\gamma+\gamma^*\to f_2(1270)$ for one real and one virtual photon. 
V.M.Braun and N.Kivel