https://doi.org/10.1140/epjc/s10052-025-14050-y
Regular Article - Theoretical Physics
New physics effects with right-handed neutrinos in semileptonic decay 
1
Malaviya National Institute of Technology Jaipur, 302017, Rajasthan, India
2
Department of Physics, University of Rajasthan, 302004, Jaipur, India
Received:
21
November
2024
Accepted:
9
March
2025
Published online:
1
April
2025
We extend the Standard Model with the general effective Hamiltonian for the quark level transition 
with a complete set of four fermion operators including right-handed neutrinos. The current experimental measurements in charm decays are compatible with the Standard Model predictions and are used to constrain the new physics. With the available experimental data, we fit a 
function to get the best-fit values of the NP WCs. We investigate the impact of allowed new physics in the observables such as differential branching fraction, forward–backward asymmetry, lepton polarization asymmetry, and convexity parameter in the semileptonic decay . The different types of new physics scenarios significantly affect these considered observables. Future experimental information on these observables can help disentangle the structure of new physics.
© The Author(s) 2025
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