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arXiv · 1501.03157

Lab-frame observables for probing the top-Higgs interaction

Fawzi Boudjema·Rohini M. Godbole·Diego Guadagnoli·Kirtimaan A. Mohan
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Abstract

We investigate methods to explore the CP nature of the $ t\bar{t}h $ coupling at the LHC, focusing on associated production of the Higgs with a $t \bar{t}$ pair. We first discuss the constraints implied by low-energy observables and by the Higgs-rate information from available LHC data, emphasizing that they cannot provide conclusive evidence on the nature of this coupling. We then investigate kinematic observables that could probe the $ t\bar{t}h $ coupling directly, in particular quantities that can be constructed out of just lab-frame kinematics. We define one such observable by exploiting the fact that $t \bar{t}$ spin correlations do also carry information about the CP-nature of the $ t\bar{t}h $ coupling. Finally, we introduce a CP-odd quantity and a related asymmetry, able to probe CP violation in the $ t\bar{t}h $ coupling and likewise constructed out of lab-frame momenta only.

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Fawzi Boudjema, Rohini M. Godbole, Diego Guadagnoli, Kirtimaan A. Mohan. 2015-03-26. Lab-frame observables for probing the top-Higgs interaction. https://doi.org/10.1103/physrevd.92.015019

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