Assessing Lepton Flavor Universality Violations in Semileptonic Decays

Author:

Sonali Patnaik, Lopamudra Nayak, Rajeev Singh

Keyword:

High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Experiment (hep-ex)

journal:

date:

2023-08-09 16:00:00

Abstract

In light of recent measurements suggesting potential lepton flavor universality violations in semileptonic decays at LHCb and other collider experiments, this article offers a brief review of the theoretical basis of tree- and loop-level $B$-hadron decays, $b \to c l \nu_l$ and $b \to s l^+ l^-$, and the experimental conditions. We reassess global averages for $\mathcal{R}_{D(D^*)}$, $\mathcal{R}_{K(K^*)}$, $\mathcal{R}_{J/\psi}$, and $\mathcal{R}_{\eta_c}$ in semileptonic transitions and have also provided the results for $B_c$ decay channels within the relativistic independent quark model context. If LHC Run 2 data evaluation corroborates Run 1 measurements, the effect of statistical significance in each decay channel could reach 5\,$\sigma$. The confirmation of these measurements could soon represent the first notable observation of physics beyond the Standard Model, broadening our perspective of New Physics.

PDF: Assessing Lepton Flavor Universality Violations in Semileptonic Decays.pdf