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|
Bibliographical noteFunding Information:
We thank G. Cvetic for careful reading of the manuscript and his valuable comments. The work of C.S.K. was supported in part by grant No. 1999-2-111-002-5 from the Interdisciplinary Research Program of the KOSEF, in part by the BSRI Program, Ministry of Education, Project No. 98-015-D00061, in part by KRF Non-Directed-Research-Fund, Project No. 1997-001-D00111, and in part by the KOSEF-DFG large collaboration project, Project No. 96-0702-01-01-2. J.L. and W.N. wish to acknowledge the financial support of 1997-sughak program of Korean Research Foundation, Project No. 1997-011-D00015.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics