# Search for the $B^{0}_{s} \to \eta^{\prime}\phi$ decay

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## Abstract

A search for the charmless $B^{0}_{s} \to \eta^{\prime}\phi$ decay is performed using $pp$ collision data collected by the LHCb experiment at centre-of-mass energies of $7$ and $8$ TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. No signal is observed and upper limits on the $B^{0}_{s} \to \eta^{\prime}\phi$ branching fraction are set to $0.82\times 10^{-6}$ at $90\%$ and $1.01\times 10^{-6}$ at $95\%$ confidence level.

## Figures and captions

 Lowest-order diagrams for the $B ^0_ s \rightarrow \eta ^{\prime} \phi$ decay. The spectator quark can become part of either the $\eta ^{\prime}$ or the $\phi$ meson, forming two different amplitudes (called PV and VP in the text). BsEtap[..].pdf [8 KiB] HiDef png [190 KiB] Thumbnail [95 KiB] Distributions of the (top left) $\pi^+\pi^-\gamma$ and (top right) $\eta ^{\prime} K^+K^-$ masses of the selected $B ^0_ s \rightarrow \eta ^{\prime} \phi$ candidates, as well as of the (bottom left) $\pi^+\pi^-\gamma$ and (bottom right) $\eta ^{\prime} K ^+$ masses of the selected $B ^+ \rightarrow \eta ^{\prime} K ^+$ candidates. The solid blue curves represent the result of the simultaneous two-dimensional fit described in the text, with the following components: $B ^0_ s \rightarrow \eta ^{\prime} \phi$ and $B ^+ \rightarrow \eta ^{\prime} K ^+$ signals (red dashed), combinatorial backgrounds (blue dot-dot-dashed), combinatorial backgrounds with real $\eta ^{\prime}$ (green dotted), and $B ^0_ s \rightarrow \phi \phi$ background (black dot-dashed). EtapFr[..].pdf [12 KiB] HiDef png [191 KiB] Thumbnail [164 KiB] Bspape[..].pdf [186 KiB] HiDef png [181 KiB] Thumbnail [138 KiB] EtapFr[..].pdf [12 KiB] HiDef png [221 KiB] Thumbnail [172 KiB] Bpaper[..].pdf [159 KiB] HiDef png [200 KiB] Thumbnail [145 KiB] Animated gif made out of all figures. PAPER-2016-060.gif Thumbnail

## Tables and captions

 Theoretical predictions for the $B ^0_ s \rightarrow \eta ^{\prime} \phi$ branching fraction. Table_1.pdf [55 KiB] HiDef png [115 KiB] Thumbnail [55 KiB] tex code Relative systematic uncertainties on the efficiency ratio $\epsilon( B ^+ \rightarrow \eta ^{\prime} K ^+ ) / \epsilon( B ^0_ s \rightarrow \eta ^{\prime} \phi )$. Table_2.pdf [19 KiB] HiDef png [92 KiB] Thumbnail [45 KiB] tex code Systematic uncertainties $\sigma_N$ and $\sigma_R$ on the fitted yield $N( B ^0_ s \rightarrow \eta ^{\prime} \phi )$ and on the yield ratio $R= N( B ^0_ s \rightarrow \eta ^{\prime} \phi )/N( B ^+ \rightarrow \eta ^{\prime} K^+ )$, respectively. The last line gives the quadratic sum of the individual uncertainties. Table_3.pdf [53 KiB] HiDef png [52 KiB] Thumbnail [26 KiB] tex code

Created on 22 October 2019.