https://doi.org/10.1140/epjc/s10052-022-10724-z
Regular Article - Theoretical Physics
Exclusive semileptonic 
-meson decays to radially excited charmonium and charm meson states
1
Department of Physics, Siksha ’O’ Anusandhan (Deemed to be University), 751030, Bhubaneswar, India
2
Department of Physics, Maharaja Sriram Chandra Bhanja Deo University, 757003, Baripada, India
3
Department of Physics, Utkal University, 751004, Bhubaneswar, India
Received:
15
June
2022
Accepted:
18
August
2022
Published online:
27
August
2022
In the wake of recent measurements of ratios of semileptonic branching fractions: 
and 
reported by the LHCb, BELLE and HFLAV Collaborations, we calculate invariant form factors for the exclusive semileptonic -meson decays to radially excited charmonium and charm meson states in the full kinematical region within the framework of relativistic independent quark (RIQ) model. We evaluate the lepton mass effect in the decay processes induced by 
transition at the quark level. Our predictions on branching fractions for 
are found 
and that for 
are 
in their 
decay modes, which lie within the detection accuracy of current experiment. Our predictions on branching fractions, forward backward asymmetry and asymmetry parameter are found in reasonable agreement with other model predictions; which can hopefully be tested in future experiments at LHC and Tevatron. Our predicted observable 
in this sector are found comparable to other standard model (SM) predictions that violate the lepton flavor universality hinting at new physics beyond SM.
© The Author(s) 2022
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