Measurement of the $B^{\pm }$ production asymmetry and the $CP$ asymmetry in $B^{\pm }\to J/\psi K^{\pm }$ decays

Abstract

The $B^{\pm }$ meson production asymmetry in $pp$ collisions is measured using $B^{+}\to {\bar{D}}^0{\pi }^{+}$ decays. The data were recorded by the LHCb experiment during Run 1 of the LHC at centre-of-mass energies of $\sqrt{s}=$ 7 and 8 TeV. The production asymmetries, integrated over transverse momenta in the range $2<p_{\mathrm{T}}<30$ GeV/$c$, and rapidities in the range $2.1<y<4.5$, are measured to be \begin{align*} \mathcal{A}_{\rm prod}(B^+,\sqrt{s}=7~{\rm TeV}) &= (-0.41 \pm 0.49 \pm 0.10) \times 10^{-2},\\ \mathcal{A}_{\rm prod}(B^+,\sqrt{s}=8~{\rm TeV}) &= (-0.53 \pm 0.31 \pm 0.10) \times 10^{-2}, \end{align*} where the first uncertainties are statistical and the second are systematic. These production asymmetries are used to correct the raw asymmetries of $B^{+}\to J/\psi K^{+}$ decays, thus allowing a measurement of the $CP$ asymmetry, \begin{equation*} \mathcal{A}_{CP} = (0.09 \pm 0.27 \pm 0.07) \times 10^{-2}. \end{equation*}

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-054.html

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• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• Measurement of the D+/- production asymmetry in 7 TeV pp collisions
• Measurement of the CKM angle $\gamma$ from a combination of LHCb results
• Measurement of the semileptonic $CP$ asymmetry in $B^0-\overline{B}{}^0$ mixing
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Cited by in corpus (7)

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• Weak Decays of Stable Open-bottom Tetraquark by SU(3) Symmetry Analysis
• Measurement of $CP$ observables in $B^{\pm }\to D{K}^{\pm }$ and $B^{\pm }\to D{\pi }^{\pm }$ with $D\to K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decays
• Measurement of the ratio of branching fractions and difference in $CP$ asymmetries of the decays $B^{+}\to J/\psi {\pi }^{+}$ and $B^{+}\to J/\psi K^{+}$
• First evidence for direct CP violation in beauty to charmonium decays
• First evidence of $CP$ violation in beauty baryon to charmonium decays