Higher Order Power Corrections in Inclusive B Decays
Thomas Mannel (Univ. Siegen), Sascha Turczyk (Univ. Siegen), Nikolai, Uraltsev (Univ. Siegen, Notre Dame U.)
TL;DR
This paper analyzes higher order power corrections in inclusive B meson decays, estimating their effects on decay rates and CKM matrix element V_{cb} with a focus on order 1/m_b^4 and 1/m_b^5 terms.
Contribution
It introduces calculations of order 1/m_b^4 and 1/m_b^5 corrections, identifying relevant hadronic matrix elements and estimating their impact on decay observables.
Findings
Shift in V_{cb} is about +0.4% due to higher order corrections
Estimates for B -> X_s+γ decays are also provided
Effects on decay rates and moments are quantified
Abstract
We discuss order 1/m_b^4 and 1/m_b^5 corrections in inclusive semileptonic decay of a meson. We identify relevant hadronic matrix elements of dimension seven and eight and estimate them using the ground-state saturation approximation. Within this approach the effects on the integrated rate and on kinematic moments are estimated. The overall relative shift in V_{cb} turns out about +0.4% as applied to the existing fits. Similar estimates are presented for B -> X_s+\gamma decays.
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