Measurement of cp asymmetry in D0 → KK+ and D0 → pp+ decays

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, LA Everse, L. Anderlini, J. Anderson, P.R. Andreassen, M. AndreottiJ.E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, J. van den Brand, K. Carvalho Akiba, V. Coco, P. N Y David, K. De Bruyn, C. Farinelli, M. Ferro-Luzzi, V. Heijne, T. Ketel, R. F. Koopman, A. Kozlinskiy, R. W. Lambert, J. van Leerdam, M. Merk, S. Oggero, G. Raven, M. Schiller, N. Serra, H. Snoek, B. Storaci, V. Syropoulos, J. van Tilburg*, S. Tolk, P. Tsopelas, N. Tuning, The LHCb collaboration

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


Time-integrated CP asymmetries in D0 decays to the final states KK+ and pp+ are measured using proton-proton collisions corresponding to 3 fb−1 of integrated luminosity collected at centre-of-mass energies of 7TeV and 8TeV. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be DACP = ACP(KK+) − ACP (pp+) = (+0.14 ± 0.16 (stat) ± 0.08 (syst))% . A measurement of ACP(KK+)  is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be ACP(KK+) = (−0.06 ± 0.15 (stat) ± 0.10 (syst))% , where the correlation coefficient between DACP and ACP(KK+) is r = 0.28. By combining these results, the CP asymmetry in the D0®pp+ channel is ACP (pp+) = (−0.20 ± 0.19 (stat) ± 0.10 (syst))%.

Original languageEnglish
Article number041
Pages (from-to)1-24
Number of pages24
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 9 Jul 2014


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


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