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Given a 4d N=2 SUSY gauge theory, one can construct the Seiberg-Wittenprepotentional, which involves a sum over instantons. Integrals over instantonmoduli spaces require regularisation. For UV-finite theories the AGT conjecturefavours particular, Nekrasov's way of regularization. It implies thatNekrasov's partition function equals conformal blocks in 2d theories withW_{N_c} chiral algebra. For $N_c=2$ and one adjoint multiplet it coincides witha torus 1-point Virasoro conformal block. We check the AGT relation betweenconformal dimension and adjoint multiplet's mass in this case and investigatethe limit of the conformal block, which corresponds to the large mass limit ofthe 4d theory e.i. the asymptotically free 4d N=2 supersymmetric Yang-Millstheory. Though technically more involved, the limit is the same as in the caseof fundamental multiplets, and this provides one more non-trivial check of AGTconjecture.

Non-conformal limit of AGT relation from the 1-point torus conformal block