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)

Authors :
Tianhong Wang
Guo-Li Wang
Tian Zhou
Geng Li
Yue Jiang
Xiao-Ze Tan
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

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