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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.

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Table_1.pdf

{Updated measurements of the $B$ meson lifetimes [7]}.

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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.

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Correlated uncertainties of the two LHCb measurements of $ f_s/f_d$ [3,5].

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Table_4.pdf

Created on 18 October 2019.