Search for New Physics in the Semileptonic D_{l4} Decays, D->K πl ν

Details Search for New Physics in the Semileptonic D_{l4} Decays, D->K πl ν Search for New Physics in the Semileptonic D_{l4} Decays, D->K πl ν

1999-11-09

arxiv.org/abs/hep-ph/9911281v2

Phys.Lett. B480 (2000) 155-163

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 16 pages, including 3 figures

Scientific paper

10.1016/S0370-2693(00)00355-5

New physics effects through the direct CP violation and the decay rate change are investigated in the semileptonic $D_{l4}$ decays, $D^\pm\to K\pi l^\pm \nu$, 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, $K+\pi$, 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.

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