First extraction of inclusive V-cb from q(2) moments

F. Bernlochner*, M. Fael, K. Olschewsky, E. Persson, R. van Tonder, K.K. Vos, M. Welsch

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present the first determination of V cb from inclusive B→ X cℓ v¯ using moments of the dilepton invariant mass, q 2. These moments are reparametrization invariant quantities and depend on a reduced set of non-perturbative parameters. This reduced set of parameters opens a new path to extract these parameters up to 1/mb4 purely from data and can potentially reduce the uncertainty on V cb. In this paper, we present our first determination of V cb using this method. Combining the recent measurements of q 2 moments by Belle and Belle II, our default fit gives |V cb| = (41.69±0.63)·10 −3. This result presents an important independent cross check of, and is consistent with, the previous state-of-the-art inclusive determinations using lepton energy and hadronic invariant mass moments.

Original languageEnglish
Article number68
Number of pages34
JournalJournal of High Energy Physics
Volume2022
Issue number10
DOIs
Publication statusPublished - 10 Oct 2022

Keywords

  • CKM Parameters
  • Semi-Leptonic Decays
  • SEMILEPTONIC-B
  • HEAVY-QUARK
  • POLE MASS
  • DECAYS
  • (B)OVER-BAR
  • RUNDEC
  • QCD

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