Confronting the vector leptoquark hypothesis with new low- and high-energy data

In light of new data we present an updated phenomenological analysis of the simplified U-1-leptoquark model addressing charged-current B-meson anomalies. The analysis shows a good compatibility of low-energy data (dominated by the lepton flavor universality ratios R-D and R-D*) with the high-energy constraints posed by pp ->; tau (tau) over bar Drell-Yan data. We also show that present data are well compatible with a framework where the leptoquark couples with similar strength to both left-and right-handed third-generation fermions, a scenario that is well-motivated from a model building perspective. We find that the high-energy implications of this setup will be probed at the 95% confidence level in the high-luminosity phase of the LHC.

Automated summary

In this study, we provide an updated phenomenological analysis of the simplified U-1-leptoquark model, which addresses the charged-current B-meson anomalies. Our analysis demonstrates that the low-energy data, which is dominated by the lepton flavor universality ratios R-D and R-D*, is in good agreement with the high-energy constraints obtained from pp → ττ-bar Drell-Yan data. We also find that the current data is consistent with a framework in which the leptoquark couples with similar strength to both left- and right-handed third-generation fermions, which is well-motivated from a model-building perspective. Furthermore, we predict that the high-energy implications of this setup will be experimentally tested at the 95% confidence level during the high-luminosity phase of the LHC.