Weak decays of Bc meson in a QCD potential model

K K Pathak; S Bhattacharya; T Das

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arXiv · 2511.11280

Weak decays of Bc meson in a QCD potential model

K K Pathak·S Bhattacharya·T Das

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Abstract

The leptonic and semileptonic decay propertis of Bc mesons are studied in a QCD potential model. The CKM element for the leptonic decay is calculated by evaluating its decay constant. With the help of the Isgur-Wise function, the form factors and the CKM element for semileptonic decay are also calculated. The variation in four-momentum square in the two decays demands two different scales of the strong coupling constant \alpha_s. Thus, a two-scale picture is evident from the study. We compute the decay constant f_p for leptonic decay and form factors for semileptonic decay with two different \alpbda scales in a specific prescription where it is related to the strong coupling \alpha_s. Within the potential model, we find the scale for leptonic decay is \lambda \le 0.150 GeV and for semileptonic decay is \lamda \ge 0.410 GeV.

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K K Pathak, S Bhattacharya, T Das. 2025-11-14. Weak decays of Bc meson in a QCD potential model. https://arxiv.org/abs/2511.11280

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