Search for New Physics in the Semileptonic D_{l4} Decays, D->K πl ν
Abstract
New physics effects through the direct CP violation and the decay rate change are investigated in the semileptonic
D
l4
decays,
D
±
→Kπ
l
±
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+π
, 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
l4
decays. We also obtained constraints on the new complex coupling within the multi-Higgs doublet model and the scalar leptoquark models.