  The sphere partition function of Calabi-Yau gauged linear sigma models
(GLSMs) has been shown to compute the exact Kaehler potential of the Kaehler
moduli space of a Calabi-Yau. We propose a universal expression for the sphere
partition function evaluated in hybrid phases of Calabi-Yau GLSMs that are
fibrations of Landau-Ginzburg orbifolds over some base manifold. Special cases
include Calabi-Yau complete intersections in toric ambient spaces and
Landau-Ginzburg orbifolds. The key ingredients that enter the expression are
Givental's I/J-functions, the Gamma class and further data associated to the
hybrid model. We test the proposal for one- and two-parameter abelian GLSMs,
making connections, where possible, to known results from mirror symmetry and
FJRW theory.
