Top-quark decay in models with Higgs triplets

Thomas G. Rizzo

doi:10.1103/PhysRevD.41.1504

Access by Xinjiang University

Top-quark decay in models with Higgs triplets

Thomas G. Rizzo

Physics Department, University of Wisconsin, Madison, Wisconsin 53706
Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011

PDF

Phys. Rev. D 41, 1504 – Published 1 March, 1990

DOI: https://doi.org/10.1103/PhysRevD.41.1504

Abstract

It is well known that if the charged Higgs scalar ( $H^{\pm}$ ) is lighter than the top quark ( $t$ ) then the decay $t \to b H^{+}$ will dominate over the usual charged-current decays via the $W$ in the two-Higgs-doublet extension of the standard model. We show that in models with Higgs fields in triplet representations, the fine-tuning of the ratio of triplet to doublet vacuum expectation values required by constraints on the $ρ$ parameter naturally leads to competitive charged-Higgs-boson and $W$ decay modes for the $t$ quark if its mass is below $M_{W} + m_{b} ≃ 85$ GeV. In these models we show that the branching fraction for $t \to b τ ν$ is always enhanced whereas the corresponding branching fraction for $t \to bl ν$ is suppressed. Universality violation is one of the best probes of this scenario.

References (13)

J. F. Gunion, H. E. Haber, G. L. Kane, and S. Dawson, University of California-Davis Report No. UCD-87-4, 1989 (unpublished)
H. E. Haber and G. L. Kane, Phys. Rep. 117C, 75 (1985)
B. W. Lee, in Proceedings of the XVI International Conference on High Energy Physics, Batavia, Illinois, 1972, edited by J. D. Jackson, A. Roberts, and R. Donaldson (NAL, Batavia, IL, 1973), Vol. 4 D. A. Ross and M. Veltman, Nucl. Phys. B95, 135 (1975) V. S. Mathur and T. G. Rizzo, Phys. Rev. D 19, 309 (1979) T. G. Rizzo, ibid. 21, 1404 (1980) U. Amaldi et al., ibid. 36, 1385 (1987) G. Costa et al., Nucl. Phys. B297, 244 (1988)
S. Glashow and S. Weinberg, Phys. Rev. D 15, 1958 (1977) S. Bertolini, Nucl. Phys. B272, 77 (1986) W. Hollik, Z. Phys. C. 32, 291 (1986) ibid.37, 569 (1988)
V. Barger and R. J. N. Phillips, Phys. Rev. D 40, 2875 (1989)
V. Barger and R. J. N. Phillips, Phys. Rev. D 41, 884 (1990)
CDF Collaboration, P. Sinervo, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions, Stanford, California, 1989, edited by M. Riordan (World Scientific, Singapore, in press)
UA1 Collaboration, K. Eggert, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])
UA2 Collaboration, L. DiLella, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])
Ross and Veltman ([3]) G. Passarino, Phys. Lett. B 228, 89 (1989)
G. B. Gelmini and M. Roncadelli, Phys. Lett. 99B, 411 (1981) H. M. Georgi, S. L. Glashow, and S. Nussinov, Nucl. Phys. B193, 297 (1981) V. Barger, H. Baer, W.-Y. Keung, and R. J. N. Phillips, Phys. Rev. D 26, 218 (1982)
ARGUS Collaboration, M. V. Danilov, and D. L. KreinickCLEO Collaboration, , in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])
A. Maki, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])

[c1] J. F. Gunion, H. E. Haber, G. L. Kane, and S. Dawson, University of California-Davis Report No. UCD-87-4, 1989 (unpublished)

[c2] H. E. Haber and G. L. Kane, Phys. Rep. 117C, 75 (1985)

[c3] B. W. Lee, in Proceedings of the XVI International Conference on High Energy Physics, Batavia, Illinois, 1972, edited by J. D. Jackson, A. Roberts, and R. Donaldson (NAL, Batavia, IL, 1973), Vol. 4 D. A. Ross and M. Veltman, Nucl. Phys. B95, 135 (1975) V. S. Mathur and T. G. Rizzo, Phys. Rev. D 19, 309 (1979) T. G. Rizzo, ibid. 21, 1404 (1980) U. Amaldi et al., ibid. 36, 1385 (1987) G. Costa et al., Nucl. Phys. B297, 244 (1988)

[c4] S. Glashow and S. Weinberg, Phys. Rev. D 15, 1958 (1977) S. Bertolini, Nucl. Phys. B272, 77 (1986) W. Hollik, Z. Phys. C. 32, 291 (1986) ibid.37, 569 (1988)

[c5] V. Barger and R. J. N. Phillips, Phys. Rev. D 40, 2875 (1989)

[c6] V. Barger and R. J. N. Phillips, Phys. Rev. D 41, 884 (1990)

[c7] CDF Collaboration, P. Sinervo, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions, Stanford, California, 1989, edited by M. Riordan (World Scientific, Singapore, in press)

[c8] UA1 Collaboration, K. Eggert, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])

[c9] UA2 Collaboration, L. DiLella, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])

[c10] Ross and Veltman ([3]) G. Passarino, Phys. Lett. B 228, 89 (1989)

[c11] G. B. Gelmini and M. Roncadelli, Phys. Lett. 99B, 411 (1981) H. M. Georgi, S. L. Glashow, and S. Nussinov, Nucl. Phys. B193, 297 (1981) V. Barger, H. Baer, W.-Y. Keung, and R. J. N. Phillips, Phys. Rev. D 26, 218 (1982)

[c12] ARGUS Collaboration, M. V. Danilov, and D. L. KreinickCLEO Collaboration, , in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])

[c13] A. Maki, in Proceedings of the XIV International Symposium on Lepton and Photon Interactions ([7])

Physical Review D

Export citation

Export citation

Top-quark decay in models with Higgs triplets

Abstract

References (13)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation