https://doi.org/10.1140/epjc/s10052-022-10302-3
Regular Article - Theoretical Physics
Pinning down 
couplings with rare charm baryon decays
Department of Physics, TU Dortmund University, Otto-Hahn-Str.4, 44221, Dortmund, Germany
Received:
14
February
2022
Accepted:
6
April
2022
Published online:
23
April
2022
We study the full angular distribution of semileptonic rare charm baryon decays in which the secondary baryon undergoes weak decay with sizable polarization parameter, 
, 
and 
. Such self-analyzing decay chains allow for seven additional observables compared to three-body decays such as 
, with different sensitivities to the weak couplings. Opportunities to test the standard model in 
transitions with standard model null tests and other angular observables are worked out. We show that a joint model-independent analysis of the leptonic 
, hadronic 
, and combined forward–backward asymmetry 
together with the fraction of longitudinally produced leptons, 
, is able to pin down the dipole couplings 
and the semileptonic (axial-) vector ones 
. is also accessible with dineutrino 
modes and probes right-handed currents.
© The Author(s) 2022
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