Probing the top-Higgs coupling through the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson at the LHC

Karol Kołodziej,Aleksandra Słapik

doi:10.1140/epjc/s10052-015-3696-y

Karol Kołodziej, Aleksandra Słapik

Open Access

https://doi.org/10.1140/epjc/s10052-015-3696-y

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Abstract

We complement the analysis of the anomalous top-Higgs coupling effects on the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson in proton–proton collisions at the LHC of the former work by one of the present authors by taking into account the quark–antiquark production mechanism. We also present simple arguments which explain why the effects of the scalar and pseudoscalar anomalous couplings on the unpolarized cross section of the process are completely insensitive to the sign of either of them.

Highlights

Determination of the coupling of the recently discovered Higgs boson [1,2] to the top quark currently belongs to one of the most challenging tasks of high energy experimental physics
We complement the analysis of the anomalous top-Higgs coupling effects on the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson in proton–proton collisions at the LHC of the former work by one of the present authors by taking into account the quark–antiquark production mechanism
We present simple arguments which explain why the effects of the scalar and pseudoscalar anomalous couplings on the unpolarized cross section of the process are completely insensitive to the sign of either of them

Summary

Introduction

Determination of the coupling of the recently discovered Higgs boson [1,2] to the top quark currently belongs to one of the most challenging tasks of high energy experimental physics. Let us note that another 24 diagrams which contain the Feynman propagators of the t-, t-quark and the Higgs boson at a time can be obtained from the signal diagrams just described by the exchange of the u-quark lines between the initial and final state They are not treated as the signal diagrams here, because they contain the gluon, Z 0 or photon propagator in the t- or u-channel and their contribution to the signal cross section is negligible anyway, which has been checked by direct computation.

Effects of the anomalous top-Higgs coupling

Results

Conclusions