cern.ch

Measurement of the $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ branching fractions

[to restricted-access page]

Information

Tools

Contact

Abstract

The branching fraction of the decay $B_{s}^{0} \rightarrow D_{s}^{(*)+}D_{s}^{(*)-}$ is measured using $pp$ collision data corresponding to an integrated luminosity of $1.0fb^{-1}$, collected using the LHCb detector at a centre-of-mass energy of $7$TeV. It is found to be \begin{align*} {\mathcal{B}}(B_{s}^{0}\rightarrow D_{s}^{(*)+}D_{s}^{(*)-}) = (3.05 \pm 0.10 \pm 0.20 \pm 0.34)\%, \end{align*} where the uncertainties are statistical, systematic, and due to the normalisation channel, respectively. The branching fractions of the individual decays corresponding to the presence of one or two $D^{*\pm}_{s}$ are also measured. The individual branching fractions are found to be \begin{align*} {\mathcal{B}}(B_{s}^{0}\rightarrow D_{s}^{*\pm}D_{s}^{\mp}) = (1.35 \pm 0.06 \pm 0.09 \pm 0.15)\%, \newline{\mathcal{B}}(B_{s}^{0}\rightarrow D_{s}^{*+}D_{s}^{*-}) = (1.27 \pm 0.08 \pm 0.10 \pm 0.14)\%. \end{align*} All three results are the most precise determinations to date.

Figures and captions

% Invariant mass distribution of the $ B ^0_ s \rightarrow D ^{(*)+}_ s D ^{(*)-}_ s $ candidates. Also shown is the fit function and the individual components of the fit model.

Fig1.pdf [43 KiB]
HiDef png [856 KiB]
Thumbnail [341 KiB]
*.C file
Fig1.pdf

% Invariant mass distribution of the $ { B ^0 \rightarrow D^{(*)\pm}_{s} D_{}^{(*)\mp}}$ candidates. Also shown is the fit function and the individual components of the fit model.

Fig2.pdf [46 KiB]
HiDef png [604 KiB]
Thumbnail [291 KiB]
*.C file
Fig2.pdf

% The $ B ^0_ s \rightarrow D ^{(*)+}_ s D ^{(*)-}_ s $ branching fraction measurements by Belle , CDF , and D0 , the current world average, the theoretical prediction from Ref. [3], and the new LHCb result.

Fig3.pdf [13 KiB]
HiDef png [83 KiB]
Thumbnail [82 KiB]
*.C file
Fig3.pdf

Animated gif made out of all figures.

PAPER-2015-053.gif
Thumbnail
thumbnail_PAPER-2015-053.gif

Tables and captions

% Efficiencies of the various selection criteria for the three individual channels of $ B ^0_ s \rightarrow D ^{(*)+}_ s D ^{(*)-}_ s $ , and for $ B ^0 \rightarrow D ^+_ s D ^- $. Each efficiency is presented relative to the previous cut and measured using simulated events, except for the PID efficiency which is obtained from data. The $ D ^+_ s $ veto was only applied to the normalisation mode, $ B ^0 \rightarrow D ^+_ s D ^- $.

Table_1.pdf [54 KiB]
HiDef png [118 KiB]
Thumbnail [55 KiB]
tex code
Table_1.pdf

% Efficiency of the normalisation channel $ B ^0 \rightarrow D ^+_ s D ^- $ relative to the signal decays.

Table_2.pdf [63 KiB]
HiDef png [112 KiB]
Thumbnail [48 KiB]
tex code
Table_2.pdf

% The yields extracted from the fit to the $ B ^0_ s \rightarrow D ^{(*)+}_ s D ^{(*)-}_ s $ candidate sample.

Table_3.pdf [52 KiB]
HiDef png [108 KiB]
Thumbnail [49 KiB]
tex code
Table_3.pdf

% The yields extracted from the fit to the $ { B ^0 \rightarrow D^{(*)\pm}_{s} D_{}^{(*)\mp}}$ candidate sample.

Table_4.pdf [52 KiB]
HiDef png [107 KiB]
Thumbnail [48 KiB]
tex code
Table_4.pdf

% Systematic uncertainties, in % of the relevant branching fraction ratio, for the $ B ^0_ s \rightarrow D ^{(*)+}_ s D ^{(*)-}_ s $ branching fraction ratios.

Table_5.pdf [77 KiB]
HiDef png [65 KiB]
Thumbnail [31 KiB]
tex code
Table_5.pdf

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