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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185499
A measurement of the CP asymmetry difference between Λc + → pK − K + and pπ−π+ decays
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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 0 b → 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 wgt CP (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 ∆A wgt CP = ACP (pK−K+) − A wgt CP (pπ−π +) = (0.30 ± 0.91 ± 0.61) %, where the first uncertainty is statistical and the second is systematic
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ALFONSO ALBERO, Alejandro, CALVO GOMEZ, M., CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, LHCb Collaboration. A measurement of the CP asymmetry difference between Λc + → pK − K + and pπ−π+ decays. _Journal of High Energy Physics_. 2018. Vol. 2018, núm. 3, pàgs. 1-21. [consulta: 24 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185499]