Speaker
Description
We advocate the use of the Matrix Element Method for the determination of the top-quark Yukawa coupling. We show the constraining power of this method at hand of the single top-quark production in association with a Higgs boson.
This process is highly sensitive to the value of the Yukawa coupling and, in contrast to many other processes, allows the direct measurement of the relative sign of the top-quark Yukawa coupling with respect to the Higgs-gauge boson coupling. Moreover, this process can also be used to investigate anomalous CP violating top-quark Yukawa couplings. To illustrate this, we adopt an effective model where the CP violation of the anomalous top-quark Yukawa coupling is parameterized with a phase. The effect of the anomalous coupling on single top-quark production in association with a Higgs boson is investigated and the Matrix Element Method is used with the NLO QCD cross section to extract the phase. It is demonstrated, that the Matrix Element Method is highly sensitive and allows for a precise determination of the top-quark Yukawa coupling.
