Testing leptoquark/EFT in (B)over-bar → D(*)l(v)over-bar at the LHC

We investigate the current LHC bounds on New Physics (NP) that contributes to (B) over bar -> D(*)l nu for l = (e, mu, tau) by considering both leptoquark (LQ) models and an effective-field-theory (EFT) Hamiltonian. Experimental analyses from l+missing searches with high p(T) are applied to evaluate the NP constraints with respect to the Wilson coefficients. A novel point of this work is to show difference between LQs and EFT for the applicable LHC bound. In particular, we find that the EFT description is not valid to search for LQs with the mass less than less than or similar to 10TeV at the LHC and leads to overestimated bounds. We also discuss future prospects of high luminosity LHC searches including the charge asymmetry of background and signal events. Finally, a combined summary for the flavor and LHC bounds is given, and then we see that in several NP scenarios the LHC constraints are comparable with the flavor ones.

Automated summary

The study investigates LHC constraints on New Physics using leptoquark models and an effective-field-theory Hamiltonian. It shows differences between LQs and EFT in terms of applicable LHC bounds. The EFT description is found to be invalid for searching for LQs with mass less than or equal to 10 TeV at the LHC and may lead to overestimated bounds. Future prospects for high luminosity LHC searches include exploring charge asymmetry in background and signal events.