cern.ch

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

[to restricted-access page]

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 [214 KiB]
Thumbnail [33 KiB]
BsEtapPhidiagram_EB-eps-converted-to.pdf

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 [323 KiB]
Thumbnail [72 KiB]
EtapFromBspaper_EB-eps-converted-to.pdf
Bspape[..].pdf [186 KiB]
HiDef png [336 KiB]
Thumbnail [76 KiB]
Bspaper_EB-eps-converted-to.pdf
EtapFr[..].pdf [12 KiB]
HiDef png [360 KiB]
Thumbnail [72 KiB]
EtapFromBpaper_EB-eps-converted-to.pdf
Bpaper[..].pdf [159 KiB]
HiDef png [365 KiB]
Thumbnail [76 KiB]
Bpaper_EB-eps-converted-to.pdf

Animated gif made out of all figures.

PAPER-2016-060.gif
Thumbnail
thumbnail_PAPER-2016-060.gif

Tables and captions

Theoretical predictions for the $ B ^0_ s \!\rightarrow \eta ^{\prime} \phi $ branching fraction.

Table_1.pdf [55 KiB]
HiDef png [91 KiB]
Thumbnail [16 KiB]
tex code
Table_1.pdf

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 [74 KiB]
Thumbnail [12 KiB]
tex code
Table_2.pdf

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 [43 KiB]
Thumbnail [8 KiB]
tex code
Table_3.pdf

Created on 11 December 2018.Citation count from INSPIRE on 11 December 2018.