Can I read CP tests of Higgs couplings in $t\bar{t}h$ semileptonic events at the LHC on EtoBox?

CP tests of Higgs couplings in $t\bar{t}h$ semileptonic events at the LHC by Azevedo, D.; Onofre, A.; Filthaut, F.; Gonçalo, R. is a scholarly article available to read on EtoBox.

What is CP tests of Higgs couplings in $t\bar{t}h$ semileptonic events at the LHC about?

The CP nature of the Higgs coupling to top quarks is addressed in this paper, in single charged lepton final states of $t\bar{t}h$ events produced in proton-proton collisions at the LHC. Pure scalar ($h=H$) and pseudo-scalar ($h=A$) Higgs boson signal events, generated with MadGraph5_aMC@NLO, are fully reconstructed using a kinematic fit. Angular distributions of the decay products, as well as CP-sensitive asymmetries, are exploited to separate and gain sensitivity to possible pseudo-scalar components of the Higgs boson and reduce the contribution from the dominant irreducible background $t\bar{t}b\bar{b}$. Significant differences are found between the pure CP-even and -odd signal hypotheses as well as with respect to the Standard Model background, in particular the $t\bar{t} b\bar{b}$ contribution. Such differences survive the event reconstruction, allowing to define optimal observables to extract the Higgs couplings parameters from a global fit. A dedicated analysis is applied to efficiently identify signal events and reject as much as possible the expected Standard Model background. The results obtained are compared with a similar analysis in the dilepton channel. We show that t

Author

Azevedo, D.; Onofre, A.; Filthaut, F.; Gonçalo, R.

Published

2017

Language

EN