Complete O(α_s²) Corrections to the Leptonic Invariant Mass Spectrum in b→ X_c lν_l Decay

2024/11/19 by Mateusz Czaja, Czaja, Mateusz, Mikołaj Misiak +3
Physics and Astronomy · Social Sciences · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #International Science and Diplomacy #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2411.12866

openalex publication_date 2024/11/19 · openalex created_date 2024/11/24 · openalex updated_date 2026/07/28

Abstract

In the determination of the Cabibbo-Kobayashi-Maskawa matrix element |V_cb| from inclusive semileptonic B-meson decays, moments of the leptonic invariant mass spectrum constitute valuable observables. To evaluate them with sufficient precision, perturbative O(α_s²) corrections to the analogous spectrum in the partonic b→ X_c lν_l decay are necessary. In the present paper, we compute such perturbative corrections in a complete manner, including contributions from the triple-charm channel, namely from the ccclν_l final states. We present our results in terms of numerical fits in both the single- and triple-charm cases. We confirm the recently found results for the single-charm correction, and analyze the triple-charm channel impact on centralized moments of the spectrum.

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