Probing a light CP-odd scalar in di-top-associated production at the LHC Mirkoantonio Casolino, Trisha Farooque, Aurelio Juste, Tao Liu and Michael Spannowsky Eur. Phys. J. C, 75 10 (2015) 498 Published online: 22 October 2015 DOI: 10.1140/epjc/s10052-015-3708-y