Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
Volume 35, Issue 17, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217751X20500761
Keywords
BS equation; semileptonic decay; form factors; relativistic correction
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Funding
- National Natural Science Foundation of China (NSFC) [11575048, 11405037, 11505039]
- HEPC Studio at Physics School of Harbin Institute of Technology
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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(-0.007)(+0.006), R(D-s) = 0.249(-0.002)(+0.001), R(D-s) = 0.320(-0.009)(+0.009,) R(D*(s)) = 0.251(-0.003)(+0.002), R(eta(c)) = 0.384(-0.042)(+0.032), and R(J/psi) = 0.267(-0.011)(+0:009), 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.
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