Additional Information on Heavy Quark Parameters from Charged Lepton Forward-Backward Asymmetry

Abstract

The determination of $|V_{cb}|$ using inclusive and exclusive (semi-)leptonic decays exhibits a long-standing tension of varying $\mathcal{O}(3\sigma )$ significance. For the inclusive determination the decay rate is expanded in $1/m_b$ using heavy quark expansion, and from moments of physical observables the higher order heavy quark parameters are extracted from experimental data in order to assess $|V_{cb}|$ from the normalisation. The drawbacks are high correlations both theoretically as well as experimentally among these observables. We will scrutinise the inclusive determination in order to add a new and less correlated observable. This observable is related to the decay angle of the charged lepton and can help to constrain the important heavy quark parameters in a new way. It may validate the current seemingly stable extraction of $|V_{cb}|$ from inclusive decays or hints to possible issues, and even may be sensitive to New Physics operators.

References in corpus (14)

• Big-Bang Nucleosynthesis
• Determination of the quark coupling strength $|V_{ub}|$ using baryonic decays
• Precision determination of the CKM element Vcb
• Mass effects in muon and semileptonic b -> c decays
• Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be explained by New Physics?
• Higher Order Power Corrections in Inclusive B Decays
• Inclusive weak decays of heavy hadrons with power suppressed terms at NLO
• Inclusive semileptonic B decays from QCD with NLO accuracy for power suppressed terms
• New ways to search for right-handed current in B -> rho ell nu decay
• Measurement of the Moments of the Photon Energy Spectrum in B -> X_s gamma Decays and Determination of |V_cb| and m_b at Belle
• Improved Estimates for the Parameters of the Heavy Quark Expansion
• Complete Michel Parameter Analysis of inclusive semileptonic b \to c transition
• Role of "Intrinsic Charm" in Semi-Leptonic B-Meson Decays
• Testing the left-handedness of the b \to c transition

Cited by in corpus (1)

• The forward-backward asymmetry and differences of partial moments in inclusive semileptonic B decays