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$D^0$-$\overline{D}^0$ mixing parameter $y$ in the factorization-assisted topological-amplitude approach
- Publication Year :
- 2017
-
Abstract
- We calculate the $D^0$-$\overline{D}^0$ mixing parameter $y$ in the factorization-assisted topological-amplitude (FAT) approach, considering contributions from $D^{0}\to PP$, $PV$, and $VV$ modes, where $P$ ($V$) stands for a pseudoscalar (vector) meson. The $D^{0}\to PP$ and $PV$ decay amplitudes are extracted in the FAT approach, and the $D^{0}\to VV$ decay amplitudes with final states in the longitudinal polarization are estimated via the parameter set for $D^{0}\to PV$. 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 $y_{PP+PV}=(0.21\pm0.07)\%$, a prediction more precise than those previously obtained in the literature, and much lower than the experimental data $y_{\rm exp}=(0.61\pm0.08)\%$. 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.<br />13 pages
- Subjects :
- Physics
Nuclear and High Energy Physics
Particle physics
Meson
010308 nuclear & particles physics
FOS: Physical sciences
Astronomy and Astrophysics
Polarization (waves)
01 natural sciences
Pseudoscalar
High Energy Physics - Phenomenology
Amplitude
High Energy Physics - Phenomenology (hep-ph)
Factorization
0103 physical sciences
Order (group theory)
High Energy Physics::Experiment
010306 general physics
Instrumentation
Mixing (physics)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....4143d8e2e98eaac821e2b09537e76a8d