The B0barB0 and BsbarBs production asymmetries, AP(B0) and AP(Bs), are measured by means of a timedependent analysis of B0 > J/\psi K*0, B0 > D pi+ and Bs > Ds pi+ decays, using a data sample corresponding to an integrated luminosity of 1.0 fb^{1}, collected by LHCb in pp collisions at a centreofmass energy of 7 TeV. The measurements are performed as a function of transverse momentum and pseudorapidity of the B0 and Bs mesons within the LHCb acceptance. The production asymmetries, integrated over pT and eta in the range 4 < pT< 30 GeV/c and 2.5<eta<4.5, are determined to be AP(B0) = (0.35 +/ 0.76 +/ 0.28)% and AP(Bs) = (1.09 +/ 2.61 +/ 0.66)%, where the first uncertainties are statistical and the second systematic.
Distributions of (left) invariant mass and (right) decay time for (top) $ B ^0 \rightarrow { J \mskip 3mu/\mskip 2mu\psi \mskip 2mu} K ^{*0} $, (middle) $ B ^0 \rightarrow D ^ \pi ^+ $ and (bottom) $ B ^0_ s \rightarrow D ^_ s \pi ^+ $ decays, with the results of the fit overlaid. The contributions of the various background sources are also shown. 
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timeBd[..].pdf [155 KiB] HiDef png [175 KiB] Thumbnail [64 KiB] *.C file 

massBd[..].pdf [173 KiB] HiDef png [209 KiB] Thumbnail [72 KiB] *.C file 

timeBd[..].pdf [160 KiB] HiDef png [217 KiB] Thumbnail [77 KiB] *.C file 

massBs[..].pdf [163 KiB] HiDef png [223 KiB] Thumbnail [74 KiB] *.C file 

timeBs[..].pdf [173 KiB] HiDef png [220 KiB] Thumbnail [74 KiB] *.C file 

Timedependent raw asymmetries for candidates in the (a) $ B ^0 \!\rightarrow { J \mskip 3mu/\mskip 2mu\psi \mskip 2mu} K ^{*0} $ , (b) $ B ^0 \rightarrow D ^ \pi ^+ $ and (c) $ B ^0_ s \rightarrow D ^_ s \pi ^+ $ signal mass regions with the results of the global fits overlaid. In (c) the asymmetry is obtained by folding the $\overline{ B }{} {}^0_ s $ and $ B ^0_ s $ decay time distributions into one oscillation period, and the offset $t_0 = 0.2$ $ {\rm \,ps}$ corresponds to the selection requirement on the decay time. 
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asymBd2Dpi.pdf [96 KiB] HiDef png [109 KiB] Thumbnail [51 KiB] *.C file 

asymBs[..].pdf [123 KiB] HiDef png [112 KiB] Thumbnail [53 KiB] *.C file 

Distributions of $p_\mathrm{T}$ and $\eta$, where the background components are subtracted using the sPlot technique [23], for (a) $ B ^0 \!\rightarrow { J \mskip 3mu/\mskip 2mu\psi \mskip 2mu} K ^{*0} $ , (b) $ B ^0 \rightarrow D ^ \pi ^+ $ and (c) $ B ^0_ s \rightarrow D ^_ s \pi ^+ $ decays. The definition of the various kinematic bins is superimposed. 
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Bd2Dpi[..].pdf [210 KiB] HiDef png [420 KiB] Thumbnail [106 KiB] *.C file 

Bs2Dsp[..].pdf [194 KiB] HiDef png [418 KiB] Thumbnail [122 KiB] *.C file 

Dependence of (top) $A_\mathrm{P}(B^0)$ and (bottom) $A_\mathrm{P}(B^0_s)$ on (left) $p_{\rm T}$ and (right) $\eta$. The error bars include both statistical and systematic uncertainties. 
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ApB0_eta.pdf [103 KiB] HiDef png [96 KiB] Thumbnail [47 KiB] *.C file 

ApBs_pt.pdf [100 KiB] HiDef png [82 KiB] Thumbnail [40 KiB] *.C file 

ApBs_eta.pdf [103 KiB] HiDef png [78 KiB] Thumbnail [39 KiB] *.C file 

Animated gif made out of all figures. 
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Values of the various physical inputs used in the fits. 
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Values of signal yields, $A_{\rm P}$, $A_{f}$ and of the correlations $\rho(A_{\rm P},\,A_f)$ obtained from global fits. The smaller value of the correlation in the $ B ^0_ s $ case is due to the much larger mixing frequency of $ B ^0_ s $ mesons. 
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Combined values of $A_\mathrm{P}( B ^0 )$ from $B^0\rightarrow J/\psi K^{*0}$ and $ B ^0 \rightarrow D ^ \pi ^+ $ decays, corresponding to the various kinematic bins. The first uncertainties are statistical and the second systematic. For completeness, the values obtained either from $B^0\rightarrow J/\psi K^{*0}$ or $ B ^0 \rightarrow D ^ \pi ^+ $ decays are also reported in the last two columns, with statistical uncertainties only. The values of the last two bins are obtained from $B^0\rightarrow J/\psi K^{*0}$ decays alone. 
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Values of $A_\mathrm{P}( B ^0_ s )$ from $ B ^0_ s \rightarrow D ^_ s \pi ^+ $ decays, corresponding to the various kinematic bins. The first uncertainties are statistical and the second systematic. 
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Values of $\omega_i$ determined from simulation and $\omega_i^{\rm data}$ extracted from data using $B^0\rightarrow J/\psi K^{*0}$ decays in two different binning schemes. The $\omega_i$ values and the difference between $\omega_i$ and $\omega_i^{\rm data}$ values are used to determine the integrated results and to evaluate the related systematic uncertainties, respectively. 
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Absolute values of systematic uncertainties. The total systematic uncertainties are obtained by summing the individual contributions in quadrature. 
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Values of the production asymmetry $A_\mathrm{P}(B^0)$ in bins of $p_{\rm T}$ and $\eta$ from $ B ^0 \rightarrow J/\psi K ^{*0} $ and $ B ^0 \rightarrow D ^ \pi ^+ $ decays. The first uncertainties are statistical and the second systematic. 
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Values of the production asymmetry $A_\mathrm{P}(B^0_s)$ in bins of $p_{\rm T}$ and $\eta$ from $ B ^0_ s \rightarrow D ^_ s \pi ^+ $ decays. The first uncertainties are statistical and the second systematic. 
Table_8.pdf [44 KiB] HiDef png [85 KiB] Thumbnail [13 KiB] tex code 
Created on 20 April 2019.Citation count from INSPIRE on 25 April 2019.