Using three- and four-body decays of D mesons produced in semileptonic b-hadron decays, precision measurements of D meson mass differences are made together with a measurement of the D 0 mass. The measurements are based on a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected in pp collisions at 7 TeV. Using the decay D 0 → K + K - K - π +, the D 0 mass is measured to be M(D 0)=1864. 75± 0.15(stat)± 0.11(syst) MeV/c 2. The mass differences M(D +)-M(D 0=4.76± 0.12(stat)± MeV/c 2. M(D s +)-M(D +)=98.68± 0.03(stat)± 0.04(syst) MeV/c 2 are measured using the D 0 → K + K - π + π - and D s + to K +K -π + modes.
All Science Journal Classification (ASJC) codes
- Física nuclear y de alta energía