Measurement of D0-D̄0 mixing parameters and search for CP violation using D0→K+π- decays


Aaij R., Adeva B., Adinolfi M., Adrover C., Affolder A., Ajaltouni Z., ...Daha Fazla

Physical Review Letters, cilt.111, sa.25, 2013 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 111 Sayı: 25
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1103/physrevlett.111.251801
  • Dergi Adı: Physical Review Letters
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Manisa Celal Bayar Üniversitesi Adresli: Evet

Özet

Measurements of charm mixing parameters from the decay-time-dependent ratio of D0→K+π- to D0→K -π+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb-1 of integrated luminosity, from proton-proton collisions at 7 and 8 TeV center-of-mass energies recorded by the LHCb experiment. In the limit of charge-parity (CP) symmetry, the mixing parameters are determined to be x′2=(5.5±4.9) ×10-5, y′=(4.8±1.0)×10 -3, and RD=(3.568±0.066)×10-3. Allowing for CP violation, the measurement is performed separately for D0 and D̄0 mesons yielding AD=(-0.7±1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|<1.24 at the 68.3% confidence level, for the parameter describing CP violation in mixing. This is the most precise determination of these parameters from a single experiment and shows no evidence for CP violation. © 2013 CERN. Published by the American Physical Society under the terms of the xlink:href=http://creativecommons.org/licenses/ by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.