2013/09/30 by LHCb collaboration, R. Aaij, B. Adeva +666 · 1 citation
Chemistry · Physics and Astronomy · #Algorithm #Analytical Chemistry (journal) #CP violation #Chemistry #Computer science #Luminosity #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ex
paper · pdf · doi:10.1103/physrevlett.111.251801
published as Phys. Rev. Lett. 111, 251801 (2013) · 10 pages, 3 figures, 2 tables. Updated version: fixed a typo in Tab. 2 (CPV allowed fit, x'^{2-} uncertainty)
openalex publication_date 2013/12/18 · arxiv created 2014/05/23 · arxiv updated 2016/03/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Measurements of charm mixing parameters from the decay-time-dependent ratio of D0\ensuremath→K+\ensuremathπ^\ensuremath- to D0\ensuremath→K^\ensuremath-\ensuremathπ+ rates and the charge-conjugate ratio are reported. The analysis uses data, corresponding to 3 fb^\ensuremath-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^\ensuremath'2=(5.5\ifmmode±\else\textpm\fi4.9)\ifmmode×\else\texttimes\fi10^\ensuremath-5, y^\ensuremath'=(4.8\ifmmode±\else\textpm\fi1.0)\ifmmode×\else\texttimes\fi10^\ensuremath-3, and RD=\phantom\rule0ex0ex(3.568\ifmmode±\else\textpm\fi0.066)\ifmmode×\else\texttimes\fi10^\ensuremath-3. Allowing for CP violation, the measurement is performed separately for D0 and D0 mesons yielding AD=(\ensuremath-0.7\ifmmode±\else\textpm\fi1.9)%, for the direct CP-violating asymmetry, and 0.75<|q/p|\phantom\rule0ex0ex<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.