One-loop effective action up to dimension eight: integrating out heavy scalar(s) Upalaparna Banerjee, Joydeep Chakrabortty, Shakeel Ur Rahaman and Kaanapuli Ramkumar Eur. Phys. J. Plus, 139 2 (2024) 159 Published online: 14 February 2024 DOI: 10.1140/epjp/s13360-024-04890-0