Rare top decay and CP violation in THDM

R. Gaitán; R. Martinez; J. H. Montes de Oca; S. Rodriguez Romo

doi:10.1140/epjc/s10052-014-2788-4

EPJ

Rare top decay and CP violation in THDM

R. Gaitán¹^*, R. Martinez², J. H. Montes de Oca¹ and S. Rodriguez Romo³

¹ Departamento de Física, FES-Cuautitlán, Universidad Nacional Autonóma de México, C.P. 54770 , Cuautitlan Izcalli, Estado de México, Mexico
² Departamento de Física, Universidad Nacional de Colombia, Bogotá D.C., Colombia
³ Departamento de Química, FES-Cuautitlán, Universidad Nacional Autonóma de México, C.P. 54770 , Cuautitlan Izcalli, Estado de México, Mexico

Received: 6 December 2013
Accepted: 18 February 2014
Published online: 4 March 2014

Abstract

We discuss the formalism of the two Higgs doublet model of type III with CP violation from CP-even CP-odd mixing in the neutral Higgs bosons. The flavor-changing interactions among neutral Higgs bosons and fermions are presented at tree level in this type of model. These assumptions allow the study of rare top decays mediated by a neutral Higgs boson; particularly we are interested in $t\rightarrow c l^+l^-$ . For this process we estimate the upper bounds of the branching ratios $\mathrm{Br }(t\rightarrow c \tau ^+\tau ^-)$ of the order of $10^{-9}\sim 10^{-7}$ for a neutral Higgs boson mass equal to 125 GeV and $\tan \beta =1$ , 1.5, 2, 2.5. For the case of $t\rightarrow c \tau ^+\tau ^-$ the number of possible events is estimated to range from 1 to 10 events, which could be observed in future experiments at LHC with a luminosity of 300 $\hbox {fb}^{-1}$ and 14 TeV for the energy of the center of mass. Also we estimate that the number of events for the process $t\rightarrow c l^+l^-$ in different scenarios is of the order of 2,500.

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EPJ

Rare top decay and CP violation in THDM

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