https://doi.org/10.1140/epjc/s10052-019-6867-4
Regular Article - Theoretical Physics
Effective theory for a heavy scalar coupled to the SM via vector-like quarks
1
PRISMA Cluster of Excellence and MITP, Johannes Gutenberg University, 55099, Mainz, Germany
2
Physik-Institut, Universität Zürich, 8057, Zurich, Switzerland
3
Department of Physics and LEPP, Cornell University, Ithaca, NY, 14853, USA
* e-mail: neubertm@uni-mainz.de
Received:
20
February
2019
Accepted:
6
April
2019
Published online:
24
April
2019
We illustrate the application of the recently developed 
framework in the context of a specific model, in which the Standard Model (SM) is supplemented by a heavy scalar S and three generations of heavy, vector-like quarks 
. We construct the appropriate effective field theory for two-body decays of S into SM particles. We explicitly compute the Wilson coefficients of the operators appearing at leading and next-to-leading order (NLO) in an expansion in powers of 
, as well as for a subset of operators arising at NNLO, retaining the full dependence on the ratio 
. For the phenomenologically most relevant decay channels of the heavy scalar, we study the impact of resummation effects of Sudakov logarithms on the decay rates.
© The Author(s), 2019
