We study the nonminimal supersymmetric heterotically deformed N=(0,2) sigma model with the Grassmannian target space GM,N. To develop the appropriate superfield formalism, we begin with a simplified model with flat target space, find its beta function up to two loops, and prove a nonrenormalization theorem. Then we generalize the results to the full model with the Grassmannian target space. Using the geometric formulation, we calculate the beta functions and discuss the 't Hooft and Veneziano limits.
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The authors are grateful to J. Chen both for the stimulating exchange that gave a start to this work and for the advise provided at its later stages. The authors also thank X. Cui for useful discussions on the topics raised in this paper. The work of M. S. was supported in part by the DOE Grant No. DE-SC0011842. E. K. was supported in part by the Robert E Greiling Jr. Scholarship for Particle Physics and Cosmic Rays. M. K. was supported by DOE HEP Award No. 0000240346.
© 2019 authors. Published by the American Physical Society.