摘要
We calculate theD^0-D^-0 mixing parameter y in the factorization-assisted topological-amplitude（FAT）approach, considering contributions from D^0→PP, PV, and VV modes, where P（V） stands for a pseudoscalar（vector） meson. The D^0→PP and PV decay amplitudes are extracted in the FAT approach, and the D^0→VV decay amplitudes with final states in the longitudinal polarization are estimated via the parameter set for D^0→PV. It is found that the VV contribution to y, being of order of 10-4, is negligible, and that the PP and PV contributions amount only up to y_（PP＋PV） =（0.21±0.07）%, a prediction more precise than those previously obtained in the literature,and much lower than the experimental data yexp =（0.61 ±0.08）%. We conclude that D^0 meson decays into other two-body and multi-particle final states are relevant to the evaluation of y, so it is difficult to understand it fully in an exclusive approach.
We calculate theD^0-D^-0 mixing parameter y in the factorization-assisted topological-amplitude（FAT）approach, considering contributions from D^0→PP, PV, and VV modes, where P（V） stands for a pseudoscalar（vector） meson. The D^0→PP and PV decay amplitudes are extracted in the FAT approach, and the D^0→VV decay amplitudes with final states in the longitudinal polarization are estimated via the parameter set for D^0→PV. It is found that the VV contribution to y, being of order of 10-4, is negligible, and that the PP and PV contributions amount only up to y_（PP＋PV） =（0.21±0.07）%, a prediction more precise than those previously obtained in the literature,and much lower than the experimental data yexp =（0.61 ±0.08）%. We conclude that D^0 meson decays into other two-body and multi-particle final states are relevant to the evaluation of y, so it is difficult to understand it fully in an exclusive approach.
作者
Hua-Yu Jiang
Fu-Sheng Yu
Qin Qin
Hsiang-nan Li
Cai-Dian Lii
蒋华玉;于福升;秦溱;李湘楠;吕才典(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000;Research Center for Hadron and CSR Physics,Lanzhou University and Institute of Modern Physics of CAS Lanzhou 730000;Theoretische Physik 1,Naturwissenschaftlich-Technische Fakultat,Universitat Siegen,Walter-Flex-Strasse 3,D-57068 Siegen;Institute of High Energy Physics,P.O.Box 918(4),Chinese Academy of Sciences,Beijing 100049;Institute of Physics,Academia Sinica,Taipei 11529,)
基金
Supported by National Natural Science Foundation of China(11347027,11505083,11375208,11521505,1162113100,11235005,U1732101)
Ministry of Science and Technology of R.O.C.(MOST-104-2112-M-001-037-MY3)
DFG Forschergruppe FOR 1873"Quark Flavour Physics and Effective Field Theories"
