Theta Dependence of Meson Masses in the Small Mass Limit of the Massive Schwinger Model

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We present a continuum formulation for θ-vacua in the massive Schwinger model on the light-front, where θ enters as a background electric field. The effective coupling of the external field is partially screened due to vacuum polarization processes. For small fermion masses and small θ we calculate the mass of the meson and find agreement with results from bosonization.