Back to Search
Start Over
Relativistic calculations of R(D(∗)), R(Ds(∗)), R(ηc) and R(J/ψ)
Relativistic calculations of R(D(∗)), R(Ds(∗)), R(ηc) and R(J/ψ)
- Source :
- International Journal of Modern Physics A. 35:2050076
- Publication Year :
- 2020
- Publisher :
- World Scientific Pub Co Pte Lt, 2020.
-
Abstract
- Recently, the deviation of the ratios $R(D)$, $R(D^{*})$ and $R(J/\psi)$ have been found between experimental data and the Standard Model predictions, which may be the hint of New Physics. In this work, we calculate these ratios within the Standard Model by using the improved instantaneous Bethe-Salpeter method. The emphasis is pad to the relativistic correction of the form factors. The results are $R(D)=0.312 ^{+0.006}_{-0.007}$, $R(D^*)= 0.249^{+0.001}_{-0.002}$, $R(D_s)=0.320 ^{+0.009}_{-0.009}$, $R(D^*_s)=0.251 ^{+0.002}_{-0.003}$, $R(\eta_c)=0.384 ^{+0.032}_{-0.042}$, and $R(J/\psi)=0.267 ^{+0.009}_{-0.011}$, which are consistent with predictions of other models and the experimental data. The semileptonic decay rates and corresponding form factors at zero recoil are also given.<br />Comment: 19 pages, 15 figures
- Subjects :
- Semileptonic decay
Physics
Nuclear and High Energy Physics
Particle physics
Work (thermodynamics)
Computer Science::Information Retrieval
Physics beyond the Standard Model
Astrophysics::Instrumentation and Methods for Astrophysics
Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing)
Astronomy and Astrophysics
Atomic and Molecular Physics, and Optics
Standard Model
High Energy Physics - Phenomenology
Computer Science::General Literature
Subjects
Details
- ISSN :
- 1793656X and 0217751X
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- International Journal of Modern Physics A
- Accession number :
- edsair.doi.dedup.....7abe3a031b4e28385eff8b8d9777df48
- Full Text :
- https://doi.org/10.1142/s0217751x20500761