A Measurement of the CP Asymmetry Difference between Λ[subscript c][superscript +] → PK[superscript −]K[superscript +] and Pπ[superscript −]π[superscript +] Decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
March 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “A Measurement of the CP Asymmetry Difference between Λ[subscript c][superscript +] → PK[superscript −]K[superscript +] and Pπ[superscript −]π[superscript +] Decays.” Journal of High Energy Physics, vol. 2018, no. 3, Mar. 2018.
Version
Final published version
Abstract
Abstract: The difference between the CP asymmetries in the decays Λ
[superscript +][subscript c] → pK[superscript −]K[superscript +] and Λ
[superscript +][subscript c] → pπ[superscript −]π[superscript +] 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[superscript −1]. The Λ[superscript +][subscript c] candidates are reconstructed as part of the Λ[superscript 0]
[subscript b] → Λ[superscript +][subscript c] µ[superscript −]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[superscript +][subscript c] → pπ[superscript −]π[superscript +] sample. This alters the definition of the integrated CP asymmetry to A[superscript wgt][subscript CP] (pπ[superscript −]π[superscript +]). Both samples are
corrected for reconstruction and selection efficiencies across the five-dimensional Λ[superscript +][subscript c] decay phase space. The difference in CP asymmetries is found to be ∆A[superscript wgt][subscript CP] = ACP (pK[superscript −]K[superscript +]) − A[superscript wgt][subscript CP] (pπ[superscript −]π[superscript +]) = (0.30 ± 0.91 ± 0.61) %, where the first uncertainty is statistical and the second is systematic. Keywords: Charm physics, CP violation, Flavor physics, Hadron-Hadron scattering (experiments
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP03(2018)182
