D0-D0 mixing parameter y in the factorization-assisted topological-amplitude approach

Hua-Yu Jiang; Fu-Sheng Yu; Qin Qin; Hsiang-nan Li; Cai-Dian L&uuml;

doi:10.1088/1674-1137/42/6/063101

Chinese Physics C> 2018, Vol. 42> Issue(6) : 063101 DOI: 10.1088/1674-1137/42/6/063101

D⁰-D⁰ mixing parameter y in the factorization-assisted topological-amplitude approach

Hua-Yu Jiang ¹ ,
Fu-Sheng Yu ^1,2 ,
Qin Qin ^3,4 ,
Hsiang-nan Li ⁵ ,
Cai-Dian Lü ⁴

1.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000
2.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000
3.
Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000
4.
Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultä
5.
Institute of High Energy Physics, P. O. Box 918(4), Chinese Academy of Sciences, Beijing 100049
6.
Institute of Physics, Academia Sinica, Taipei 11529
7.

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Abstract：
We calculate the D⁰-D⁰ mixing parameter y in the factorization-assisted topological-amplitude (FAT) approach,considering contributions from D⁰→PP,PV,and VV modes,where P (V) stands for a pseudoscalar (vector) meson.The D⁰→PP and PV decay amplitudes are extracted in the FAT approach,and the D⁰→VV decay amplitudes with flnal states in the longitudinal polarization are estimated via the parameter set for D⁰→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 y_exp=(0.61±0.08)%.We conclude that D⁰ meson decays into other two-body and multi-particle flnal states are relevant to the evaluation of y,so it is difficult to understand it fully in an exclusive approach.
- mixing of charmed mesons ,
- strong interactions ,
- weak interactions ,
- decays of charmed mesons

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Hua-Yu Jiang, Fu-Sheng Yu, Qin Qin, Hsiang-nan Li and Cai-Dian Lü. D⁰-D⁰ mixing parameter y in the factorization-assisted topological-amplitude approach[J]. Chinese Physics C, 2018, 42(6): 063101. doi: 10.1088/1674-1137/42/6/063101

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Received: 2018-03-09

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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) and DFG Forschergruppe FOR 1873 Quark Flavour Physics and Efiective Field Theories

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