Measurement of the time-integrated CP asymmetry in D0 → K0SK0decays

LHCb Collaboration, 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. Anderlini, J. AndersonG. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d’Argent, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, N. K. Watson, T. Williams

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Abstract

The time-integrated CP asymmetry in the decay D0→ K0SK0S is measured using 3 fb−1of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The flavour of the D0meson is determined by use of the decay D*+→ D0π+and its charge conjugate mode. The result is ACP=−0.029±0.052±0.022, where the first uncertainty is statistical and the second systematic. The result is consistent with Standard Model expectations and improves the uncertainty with respect to the only previous measurement of this quantity by more than a factor of three.

Original languageEnglish
Article number55
Number of pages15
JournalJournal of High Energy Physics
Volume2015
Issue number10
DOIs
Publication statusPublished - 8 Oct 2015

Keywords

  • Charm physics
  • CP violation
  • Flavor physics
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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