Probing Higgs boson couplings in $t\bar{t}b\bar{b}$ production at the LHC

TL;DR

This study explores how dimension six operators in the Standard Model effective field theory affect $t\bar{t}b\bar{b}$ production at the LHC, providing improved constraints on certain Wilson coefficients using simulated events and CMS data.

Contribution

It introduces a novel analysis of $t\bar{t}b\bar{b}$ events at 13 TeV to constrain effective Wilson coefficients, surpassing previous limits from other channels.

Findings

Stronger constraints on Wilson coefficients $\bar{C}_{g},\tilde{C}_{g},\bar{C}_{uG},\bar{C}_{uW}$.

Sensitivity of $t\bar{t}b\bar{b}$ events to effective operators.

Use of CMS cross-section measurements to limit new physics.

Abstract

In this paper, we investigate the effects of dimension six operators in the framework of the standard model (SM) effective field theory on using $t\bar{t}b\bar{b}$ channel at the LHC with the center-of-mass energy of 13 TeV. In this analysis, we only assume leptonic top-quarks. Once the events were simulated, the CMS-measured cross-section was used to constrain the corresponding effective Wilson coefficients at $95\%$ confidence level. Considering the SM effective Lagrangian, the $t\bar{t}b\bar{b}$ events in proton-proton collision were very sensitive to the effective Wilson coefficients $ \bar{C}_{g},\tilde{C_{g}},\bar{C}_{uG},\bar{C}_{uW}$. We show that using $t\bar{t}b\bar{b}$ events, we can provide stronger constraints on these Wilson coefficients than the current ones obtained from other channels.