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A measurement of $\Delta \Gamma_{s}$

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Abstract

Using a dataset corresponding to $9 \mathrm{fb}^{-1}$ of integrated luminosity collected with the LHCb detector between 2011 and 2018 in proton-proton collisions, the decay-time distributions of the decay modes $B_s^0 \rightarrow J/\psi \eta'$ and $B_s^0 \rightarrow J/\psi \pi^{+} \pi^{-}$ are studied. The decay-width difference between the light and heavy mass eigenstates of the $B_s^0$ meson is measured to be $\Delta \Gamma_s = 0.087 \pm 0.012 \pm 0.009 \mathrm{ps}^{-1}$, where the first uncertainty is statistical and the second systematic.

Figures and captions

Invariant mass distributions with the fit projection overlaid for the $ { J \mskip -3mu/\mskip -2mu\psi } \eta ^{\prime} $ mode for the four datasets. For each dataset the eight time bins are summed.

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Invariant mass distributions with the fit projection overlaid for the $ { J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^- $ mode for the four datasets. For each dataset the eight time bins are summed.

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fig2b.pdf [25 KiB]
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fig2c.pdf [26 KiB]
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Measurements of $R$ for the four datasets. The red line for each plot shows the result of the fit described in the text.

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fig3b.pdf [14 KiB]
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fig3c.pdf [14 KiB]
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Measurement of $\Delta \Gamma_s$ for the four datasets and their weighted average. The orange band is the $1\sigma$ error band.

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Animated gif made out of all figures.

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Tables and captions

Decay-time binning scheme.

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Values of $\Delta \Gamma_s$ and the $\chi^2$ probability obtained from the fits to $R$ for the four datasets. The uncertainties are statistical.

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Systematic uncertainties on the measurement of $\Delta \Gamma_s$.

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Created on 27 April 2024.