New Physics in inclusive $\bar{B} \to X_c \ell \bar{\nu}$ decays

Abstract

We present the first global phenomenological fit of inclusive $\bar B\to X_c\ell\bar\nu$ observables to all available experimental data allowing for generic dimension-six New Physics interactions in the Weak Effective Theory. The fit includes both New Physics Wilson coefficients and non-perturbative QCD parameters. New Physics contributions are calculated including power corrections up to $\mathcal O(\Lambda_{\rm QCD}^3/m_b^3)$ and perturbative QCD corrections up to $\mathcal O(\alpha_s)$. We find no significant preference for New Physics and obtain bounds on the size of the relevant Wilson Coefficients competitive with those coming from exclusive modes.