A measurement of the $CP$ asymmetry difference in $\varLambda_{c}^{+} \to pK^{-}K^{+}$ and $p\pi^{-}\pi^{+}$ decays

Peter Clarke, Greig Cowan, Stephan Eisenhardt, Silvia Gambetta, Franz Muheim, Matthew Needham, Stephen Playfer, LHCb Collaboration, Marco Pappagallo

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The difference between the CP asymmetries in the decays Λ$_{c}^{+}$  → pK$^{−}$K$^{+}$ and Λ$_{c}^{+}$  → pπ$^{−}$π$^{+}$ is presented. Proton-proton collision data taken at centre-of-mass energies of 7 and 8 TeV collected by the LHCb detector in 2011 and 2012 are used, corresponding to an integrated luminosity of 3 fb$^{−1}$. The Λ$_{c}^{+}$ candidates are reconstructed as part of the Λ$_{b}^{0}$  → Λ$_{c}^{+}$ μ$^{−}$X decay chain. In order to maximize the cancellation of production and detection asymmetries in the difference, the final-state kinematic distributions of the two samples are aligned by applying phase-space-dependent weights to the Λ$_{c}^{+}$  → pπ$^{−}$π$^{+}$ sample. This alters the definition of the integrated CP asymmetry to A$_{CP}^{wgt}$ (pπ$^{−}$π$^{+}$). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λ$_{c}^{+}$ decay phase space. The difference in CP asymmetries is found to be
Original languageEnglish
Article numberAaij:2017xva
Pages (from-to)182
Journal Journal of High Energy Physics
Publication statusPublished - 29 Mar 2018


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