New physics effects through the direct CP violation and the decay rate change are investigated in the semileptonic D(l)4 decays, D±→ Kπl±ν, by including a scalar-exchange interaction with a complex coupling. In the decay process, we included various excited states as intermediate states decaying to the final hadrons, K+ τ, and found that among the intermediate states only the lowest state (K*) is dominant and the Other higher excited states are negligible, contrary to the B(l)4 decays. We also obtained constraints on the new complex coupling within the multi-Higgs doublet model and the scalar leptoquark models. (C) 2000 Published by Elsevier Science B.V.
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2000 May 4|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics