Higgs mediated flavor violating top quark decayst→uiH,uiγ,uiγγ, and the processγγ→tcin effective theories

2009/11/30 by J. I. Aranda, A. Cordero-Cid, F. Ramirez-Zavaleta +3 · 24 citations
Physics and Astronomy · #Computer science #Higgs boson #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.81.077701

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 81(7) (American Physical Society) · 5 pages and 3 figures

openalex publication_date 2010/04/26 · arxiv created 2010/06/02 · arxiv updated 2010/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The rare top quark couplings tu_i\ensuremathγ and tu_i\ensuremathγ\ensuremathγ (u_i=u, c) induced at the one-loop level by a flavor violating tu_iH vertex are studied within the context of an effective Yukawa sector that incorporates SU_L(2)\ifmmode×\else\texttimes\fiU_Y(1)-invariant operators of up to dimension six. Data on the recently observed D⁰\ensuremath-D⁰ mixing are employed to constrain the tu_iH vertex, which is then used to predict the t\ensuremath→u_iH, t\ensuremath→u_i\ensuremathγ, and t\ensuremath→u_i\ensuremathγ\ensuremathγ decays, as well as the \ensuremathγ\ensuremathγ\ensuremath→tu_i+tu_i reaction in the context of the ILC. It is found that the t\ensuremath→cH and t\ensuremath→c\ensuremathγ\ensuremathγ decays can reach sizable branching ratios as high as 5\ifmmode×\else\texttimes\fi10^\ensuremath-3 and 10^\ensuremath-4, respectively. As for the t\ensuremath→c\ensuremathγ decay, it can have a branching ratio of 5\ifmmode×\else\texttimes\fi10^\ensuremath-8 that is about 6 orders of magnitude larger than the standard model prediction, which, however, is still very small to be detected. As for tc production, it is found that, due to the presence of a resonant effect in the convoluted cross section \ensuremathσ(e⁺e^\ensuremath-\ensuremath→\ensuremathγ\ensuremathγ\ensuremath→tc+tc), about (0.5--2.7)\ifmmode×\else\texttimes\fi10³ tc events may be produced at the ILC for a value of the Higgs mass near to the top mass.

Citations

• Top-quark rare decay t→ch in R-parity-violating SUSY
• Flavor changingt→cl1−l2+decay in the general two Higgs doublet model
• Rare decay of the topt→cggin the standard model
• Loop induced flavor changing neutral decays of the top quark in a general two-Higgs-doublet model
• Top-charm associated production at high energy e+e− colliders in the standard model
• Rare top quark decayst→cVin the top-color-assisted technicolor model
• Effects of an extraZ′gauge boson on the top quark decayt→cγgamma

Cited by

• Direct and indirect searches for top-Higgs FCNC couplings