Journal Article PUBDB-2022-00217

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Measurement of the branching fraction of the ${{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $ decay

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2021
Springer Heidelberg

The European physical journal / C 81(4), 314 () [10.1140/epjc/s10052-020-08790-2]
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Report No.: CERN-EP-2020-183; LHCb-PAPER-2020-021; arXiv:2010.11986

Abstract: A branching fraction measurement of the ${{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $ decay is presented using proton–proton collision data collected with the LHCb experiment, corresponding to an integrated luminosity of $5.0\,\text {fb} ^{-1} $. The branching fraction is found to be ${\mathcal {B}} ({{B} ^0} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} ) =(19.4 \pm 1.8\pm 1.3 \pm 1.2)\times 10^{-6}$, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the ${{B} ^0} {\rightarrow }{{D} ^-} {{\pi } ^+} $, ${{D} ^+_{s}} {\rightarrow }{{K} ^+} {{K} ^-} {{\pi } ^+} $ and ${{D} ^-} {\rightarrow }{{K} ^+} {{\pi } ^-} {{\pi } ^-} $ branching fractions. This is the most precise single measurement of this quantity to date. As this decay proceeds through a single amplitude involving a $b{\rightarrow }u$ charged-current transition, the result provides information on non-factorisable strong interaction effects and the magnitude of the Cabibbo–Kobayashi–Maskawa matrix element $V_{ub}$. Additionally, the collision energy dependence of the hadronisation-fraction ratio $f_s/f_d$ is measured through ${{\overline{B}} {}^0_{s}} {\rightarrow }{{D} ^+_{s}} {{\pi } ^-} $ and ${{B} ^0} {\rightarrow }{{D} ^-} {{\pi } ^+} $ decays.

Keyword(s): p p: colliding beams ; strong interaction: effect ; p p: scattering ; B0: hadronic decay ; B0: branching ratio: measured ; energy dependence ; charged current ; statistical ; CKM matrix ; LHC-B ; CERN LHC Coll ; experimental results ; B0 --> D/s+ pi- ; B0 --> D- pi+ ; 7000 GeV-cms ; 8000 GeV-cms ; 13000 GeV-cms

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Note: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-021.html (LHCb public pages)

Contributing Institute(s):
  1. Informationstechnologie (IT)
Research Program(s):
  1. 6G9 - IDAF (DESY) (POF4-6G9) (POF4-6G9)
Experiment(s):
  1. DESY: TIER-II

Appears in the scientific report 2021
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 Record created 2022-01-17, last modified 2025-07-24


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