Search for CP violation in D±→ K0 SK± and D±s→ K0Sπ± decays

LHCb Collaboration, R. Aaij, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. AnderliniJ. Anderson, R. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

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Abstract

A search for CP violation in Cabibbo-suppressed D±→ K0 SK±and D±s→ K0Sπ± decays is performed using pp collision data, corresponding to an integrated luminosity of 3 fb-1, recorded by the LHCb experiment. The individual CP-violating asymmetries are measured to be ACP → K0SK± = (+0.03 ± 0.17 ± 0.14)%

AD±sCP → K0Sπ± = (+0.38 ± 0.46 ± 0.17)%, assuming that CP violation in the Cabibbo-favoured decays is negligible. A combination of the measured asymmetries for the four decay modes D±(s) → K0 SK±and D±(s) → K0Sπ± gives the sum AD±→K0SK±CP + AD±s→K0Sπ± CP = (+0.41 ± 0.49 ± 0.26)%. In all cases, the first uncertainties are statistical and the second systematic. The results represent the most precise measurements of these asymmetries to date and show no evidence for CP violation.

Original languageEnglish
Article number25
Number of pages18
JournalJournal of High Energy Physics
Volume2014
Issue number10
DOIs
Publication statusPublished - 3 Oct 2014

Keywords

  • CP violation
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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