Abstract
Abstract A study of mixing and indirect CP violation in D 0 mesons through the determination of the parameters y CP and A Γ is presented. The parameter y CP is the deviation from unity of the ratio of effective lifetimes measured in D 0 decays to the CP eigenstate K + K − with respect to decays to the Cabibbo favoured mode K −π+. The result measured using data collected by LHCb in 2010, corresponding to an integrated luminosity of 29 pb−1, is y CP = (5.5 ± 6.3stat ± 4.1syst) × 10−3. The parameter A Γ is the asymmetry of effective lifetimes measured in decays of D 0 and $ {\overline D^0} $ mesons to K + K −. The result is A Γ = (−5.9 ± 5.9stat ± 2.1syst) × 10−3. A data-driven technique is used to correct for lifetime-biasing effects.
Highlights
A study of mixing and indirect CP violation in D0 mesons through the determination of the parameters yCP and AΓ is presented
The parameter yCP is the deviation from unity of the ratio of effective lifetimes measured in D0 decays to the CP eigenstate K+K− with respect to decays to the Cabibbo favoured mode K−π+
The parameter AΓ is the asymmetry of effective lifetimes measured in decays of D0 and D0 mesons to K+K−
Summary
LHCb is a precision heavy flavour experiment which exploits the abundance of charm particles produced in collisions at the Large Hadron Collider (LHC). Is a single arm spectrometer at the LHC with a pseudorapidity acceptance of 2 < η < 5 for charged particles. High precision measurements of flight distances are provided by the Vertex Locator (VELO), which consists of two halves with a series of semi-circular silicon microstrip detectors. The VELO measurements, together with momentum information from forward tracking stations and a 4 Tm dipole magnet, lead to decay-time resolutions of the order of one tenth of the D0 lifetime. Two Ring-Imaging Cherenkov (RICH) detectors using three different radiators provide excellent pion-kaon separation over the full momentum range of interest. The detector is completed by hadronic and electromagnetic calorimeters and muon stations. The sample corresponding to an integrated lmumeaisnuorseimtyeonfts29pprebs−e1ntoefdpphecroelliasrieonbsaasted√osn=a7dTaetVa recorded during the LHC run in 2010
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