Determining tan(beta) in \tau\tau Fusion to SUSY Higgs Bosons at a   Photon Collider
  We investigate \tau\tau fusion to light h and heavy H and A Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM) at a photon collider as a promising channel for measuring large values of tan(beta). For standard design parameters of a photon collider an error \Delta tan(beta) \sim 1, uniformly for tan(beta) \gsim 10, may be expected, improving on complementary measurements at the LHC and e+e- linear colliders. 
S.Y. Choi, J. Kalinowski, J.S. Lee, M.M. Muhlleitner, M. Spira and   P.M. Zerwas