Normalized solutions to a critical growth Choquard equation involving mixed operators

In this paper we study the existence and regularity results of normalized solutions to the following critical growth Choquard equation with mixed diffusion type operators: − Δ u + ( − Δ ) s u = λ u + g ( u ) + ( I α * | u | 2 α * ) | u | 2 α * − 2 u in R N , ∫ R N | u | 2 d x = τ 2 , where N ⩾ 3 , τ > 0 , I α is the Riesz potential of order α ∈ ( 0 , N ) , ( − Δ ) s is the fractional laplacian operator, 2 α * =