T-structures on some local Calabi-Yau varieties

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Let Z be a Fano variety satisfying the condition that the rank of the Grothendieck group of Z is one more than the dimension of Z. Let ωZ denote the total space of the canonical line bundle of Z, considered as a non-compact Calabi-Yau variety. We use the theory of exceptional collections to describe t-structures on the derived category of coherent sheaves on ωZ. The combinatorics of these t-structures is determined by a natural action of an affine braid group, closely related to the well-known action of the Artin braid group on the set of exceptional collections on Z.