A measurement of the CP asymmetry difference between Λc + → pK K + and pππ+ decays

The LHCb Collaboration

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The difference between the CP asymmetries in the decays Λc + → pKK+ and Λc + → pππ+ 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 Λc + candidates are reconstructed as part of the Λb 0 → Λc +μX 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 Λc + → pππ+ sample. This alters the definition of the integrated CP asymmetry to ACP wgt(pππ+). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λc + decay phase space. The difference in CP asymmetries is found to be ΔACPwgt=ACP(pK−K+)−ACPwgt(pπ−π+)=(0.30±0.91±0.61)%, where the first uncertainty is statistical and the second is systematic.[Figure not available: see fulltext.].

Original languageEnglish
Article number182
JournalJournal of High Energy Physics
Volume2018
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018

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asymmetry
decay
protons
cancellation
center of mass
kinematics
luminosity
collisions
detectors
energy

Keywords

  • Charm physics
  • CP violation
  • Flavor physics
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

A measurement of the CP asymmetry difference between Λc + → pK K + and pππ+ decays. / The LHCb Collaboration.

In: Journal of High Energy Physics, Vol. 2018, No. 3, 182, 01.03.2018.

Research output: Contribution to journalArticle

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abstract = "The difference between the CP asymmetries in the decays Λc + → pK−K+ and Λc + → 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 Λc + candidates are reconstructed as part of the Λb 0 → Λc +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 Λc + → pπ−π+ sample. This alters the definition of the integrated CP asymmetry to ACP wgt(pπ−π+). Both samples are corrected for reconstruction and selection efficiencies across the five-dimensional Λc + decay phase space. The difference in CP asymmetries is found to be ΔACPwgt=ACP(pK−K+)−ACPwgt(pπ−π+)=(0.30±0.91±0.61){\%}, where the first uncertainty is statistical and the second is systematic.[Figure not available: see fulltext.].",
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