Angular analysis of B0D∗−Ds∗+ with Ds∗+→Ds+γ decays

The Lhcb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The first full angular analysis of the B0→D∗−Ds∗+ decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The Ds∗+→Ds+γ and D*− → D¯ π vector meson decays are used with the subsequent Ds+ → K+Kπ+ and D¯ → K+π decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [ℬ(B0→D∗−Ds∗+) × ℬ(Ds∗+→Ds+γ)]/ℬ(B0 → D*−Ds+) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D*−Ds+ decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(Bs → D*−Ds+)/ℬ(B0 → D*−Ds+) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions. [Figure not available: see fulltext.]

Original languageEnglish
Article number177
Pages (from-to)1-30
Number of pages30
JournalJournal of High Energy Physics
Volume2021
Issue number6
Early online date29 Jun 2021
DOIs
Publication statusPublished - Jun 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • B physics
  • Branching fraction
  • Hadron-Hadron scattering (experiments)
  • Polarization

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