# Updated average $f_s/f_d$ $b$-hadron production fraction ratio for 7 TeV $pp$ collisions

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## Abstract

Improved knowledge of the branching fraction of the decay $D_{s}^{-} \rightarrow K^{+}K^{-}\pi^{-}$ and of the $B$ meson lifetimes has an impact on the measurement of the ratio of $B ^0_ s$ and $B ^0$ meson production cross-sections, $f_{s}/f_{d}$, measured at LHCb . This note reports a new combination of the LHCb measurements of $f_s/f_d$, resulting in $f_s/f_d = 0.259 \pm 0.015$.

## Tables and captions

 Updated measurements of the branching fraction of the $D_{s}^{-} \rightarrow K^{+}K^{-}\pi^{-}$ decay and their average used in the combination. Table_1.pdf [46 KiB] HiDef png [89 KiB] Thumbnail [14 KiB] tex code {Updated measurements of the $B$ meson lifetimes [7]}. Table_2.pdf [44 KiB] HiDef png [58 KiB] Thumbnail [9 KiB] tex code Uncorrelated uncertainties of the two LHCb measurements of $f_s/f_d$ [3,5]. The particle identification uncertainty present in both measurements is considered fully uncorrelated since the semileptonic measurement was performed analyzing an integrated luminosity of $3$ $\,pb^{-1}$ acquired in 2010, while the hadronic measurement was performed analyzing an integrated luminosity of $1$ $\,fb^{-1}$ acquired in 2011. Table_3.pdf [58 KiB] HiDef png [151 KiB] Thumbnail [23 KiB] tex code Correlated uncertainties of the two LHCb measurements of $f_s/f_d$ [3,5]. Table_4.pdf [44 KiB] HiDef png [66 KiB] Thumbnail [10 KiB] tex code

Created on 23 February 2019.Citation count from INSPIRE on 23 February 2019.