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Measurement of D0–Dˉ0D^0–\bar D^0 Mixing Parameters and Search for CPCP Violation Using D0→K+π−D^0 \to K^+ \pi^- Decays

Collaboration
Sep 25, 2013
9 pages
Published in:
  • Phys.Rev.Lett. 111 (2013) 25, 251801
  • Published: Dec 18, 2013
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2013-176,
  • LHCB-PAPER-2013-053
Experiments:
View in:
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Abstract: (APS)
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 D¯0 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.
Note:
  • 10 pages, 3 figures, 2 tables. Updated version: fixed a typo in Tab. 2 (CPV allowed fit, x'^{2-} uncertainty)
  • 11.30.Er
  • 12.15.Ff
  • 13.25.Ft
  • 14.40.Lb
  • CP: violation
  • p p: scattering
  • D0 anti-D0: mixing
  • asymmetry: CP
  • particle identification: flavor
  • LHC-B
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