Measurement of the relative $B_c^{\pm }/B^{\pm }$ production cross section with the ATLAS detector at $\sqrt{s}=8$ TeV

Abstract

The total cross section and differential cross sections for the production of $B_c^{\pm }$ mesons, times their branching fraction to $J/\psi {\pi }^{\pm }$, are measured relative to those for the production of $B^{\pm }$ mesons, times their branching fraction to $J/\psi K^{\pm }$. The data used for this study correspond to an integrated luminosity of $20.3{\mathrm{fb}}^{-1}$ of $pp$ collisions recorded by the ATLAS detector at the Large Hadron Collider in 2012 at a center-of-mass energy of $\sqrt{s}=8$ TeV. The measurement is performed differentially in bins of transverse momentum $p_{\mathrm{T}}$ for $13$ GeV $<p_{\mathrm{T}}(B_c^{\pm })<22$ GeV and $p_{\mathrm{T}}(B_c^{\pm })>22$ GeV and in bins of rapidity $y$ for $|y|<0.75$ and $0.75<|y|<2.3$. The relative cross section times branching fraction for the full range $p_{\mathrm{T}}>13$ GeV and $|y|<2.3$ is $(0.34\pm 0.04_{\text{stat}}{}_{-0.02}^{+0.06}{}_{\text{sys}}\pm 0.01_{\text{lifetime}})\%$. The differential measurements suggest that the production cross section of the $B_c^{\pm }$ decreases faster with $p_{\mathrm{T}}$ than the production cross section of the $B^{\pm }$, while no significant dependence on rapidity is observed.

39 pages in total, author list starting page 23, 7 figures, submitted to PRD. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2016-03

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