Top-quark mass from the diphoton mass spectrum
Institute of Convergence Fundamental Studies, Seoul National University of Science and Technology, Seoul, 01811, Korea
2 Quantum Universe Center, KIAS, Seoul, 02455, Korea
* e-mail: email@example.com
Accepted: 5 May 2017
Published online: 18 May 2017
We calculate the amplitude by including the bound-state effects near their mass threshold. In terms of the non-relativistic expansion of the amplitude, the LO contribution is an energy-independent term in the one-loop amplitude. We include the NLO contribution described by the non-relativistic Green function and part of the NNLO contribution. Despite a missing NLO piece which can be accomplished with the two-loop-level amplitude via massive quarks, the shape of the diphoton mass spectrum is predicted with a good accuracy. Thanks to the simple and clean nature of the observable, its experimental measurement can be a direct method to determine the short-distance mass of the top quark at hadron colliders.
© The Author(s), 2017