https://doi.org/10.1140/epja/s10050-026-01832-5
Regular Article - Theoretical Physics
Semileptonic decay and form factors of 
1
Department of Physics, Government College Daman, Kunta Road, 396210, Daman, India
2
Veer Narmad South Gujarat University, Surat, India
a
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Received:
22
December
2025
Accepted:
5
March
2026
Published online:
29
March
2026
Abstract
We investigated the heavy-to-heavy semileptonic decay 
within the framework of the Hypercentral Constituent Quark Model (HCQM). The ground-state masses of the involved baryons were evaluated by numerically solving the six-dimensional hyperradial Schrödinger equation, incorporating both hyper-Coulomb and linear confinement potentials along with spin-dependent interactions. The Heavy Quark Effective Field Theory (HQET) form factors are computed up to the subleading order, incorporating 
corrections that account for finite mass effects beyond the heavy-quark symmetry limit. These form factors were then employed to analyse the heavy-to-heavy semileptonic decay rate via helicity formalism. The decay width and branching ratio results were compared to those obtained using various theoretical approaches.
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Communicated by Eulogio Oset.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
