Search for CP violation in D(s)+→ h+π0 and D(s)+→ h+η decays

Research output: Contribution to journalArticlepeer-review

Authors

  • LHCb Collaboration

Colleges, School and Institutes

External organisations

  • Nikhef National Institute for Subatomic Physics
  • University of Zurich
  • University of Liverpool
  • Universidad de Santiago de Compostela
  • University of Bristol
  • Université Clermont Auvergne
  • University of Michigan
  • Istituto Nazionale di Fisica Nucleare, Sezione di Milano
  • University of Cincinnati
  • TU Dortmund University, Germany
  • CERN
  • University of Glasgow
  • Universitat de Barcelona
  • University of Manchester
  • Petersburg Nuclear Physics Institute (PNPI)
  • University of Cambridge
  • Universidade Federal Do Rio de Janeiro
  • Paris-Saclay University
  • Sezione INFN di Firenze
  • Sezione INFN di Ferrara
  • Ruprecht-Karls-Universität Heidelberg
  • Institute for High Energy Physics (IHEP)
  • Syracuse University
  • Yandex School of Data Analysis
  • IN2P3
  • Ecole Polytechnique Federale de Lausanne
  • University of Warwick
  • Sezione di Perugia
  • University of Ferrara
  • Chinese Academy of Sciences
  • Sezione di Genova

Abstract

Searches for CP violation in the two-body decays D(s)+→h+π0 and D(s)+→h+η (where h+ denotes a π+ or K+ meson) are performed using pp collision data collected by the LHCb experiment corresponding to either 9 fb−1 or 6 fb−1 of integrated luminosity. The π0 and η mesons are reconstructed using the e+eγ final state, which can proceed as three-body decays π0→ e+eγ and η → e+eγ, or via the two-body decays π0→ γγ and η → γγ followed by a photon conversion. The measurements are made relative to the control modes D(s)+→KS0h+ to cancel the production and detection asymmetries. The CP asymmetries are measured to be

ACP(D+→π+π0) = (−1.3±0.9±0.6)%,
ACP(D+→K+π0) = (−3.2±4.7±2.1)%,
ACP(D+→π+η) = (−0.2±0.8±0.4)%,
ACP(D+→K+η) = (−6±10±4)%,
ACP(Ds+→K+π0) = (−0.8±3.9±1.2)%,
ACP(Ds+→π+η) = (0.8±0.7±0.5)%,
ACP(Ds+→K+η) = (0.9±3.7±1.1)%,

where the first uncertainties are statistical and the second systematic. These results are consistent with no CP violation and mostly constitute the most precise measurements of ACP in these decay modes to date. 

Bibliographic note

Publisher Copyright: © 2021, The Author(s).

Details

Original languageEnglish
Article number19
Number of pages25
JournalJournal of High Energy Physics
Volume2021
Issue number6
Publication statusPublished - 3 Jun 2021

Keywords

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

ASJC Scopus subject areas