Rare Top Decays in the Smallest Higgs Model With T-Parity

Yang, H.; Yue, C. X.; Jia, Wen Bao; Wang, Yong-Zhi

doi:10.1142/s0217732309030291

Cited by 6 publications

(6 citation statements)

References 25 publications

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“…The matrix elements of V H d have been severely constrained by the FCNC processes in K, B and D meson systems [34,39]. To simplify our discussion, we consider two scenarios which can easily escape the constraints [27,28,40]:…”

Section: Bmentioning

confidence: 99%

“…The aim of this work is to perform a comprehensive analysis of the FCNC top quark decays t → cV V (V = γ, Z, g) and t → cf f (f = b, τ, µ, e) in the little Higgs model with T-parity (LHT) [26]. In the LHT model, the related two-body decays t → cg, cγ, cZ, cH and the three-body decays t → cl l (l = τ, µ, e) have been studied in [27,28] respectively, and these studies show that, compared with the SM, the rates of these decays can be greatly enhanced. So taking the completeness and the phenomenon of higher order dominance into consideration [14], it is necessary to consider all the three-body decays, which will be done in this work.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting rare top quark decays in the littlest Higgs Model with T-parity

Han

Yang

2016

Int. J. Mod. Phys. A

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In the littlest Higgs model with T-parity (LHT), the mirror quarks have flavor structures and will contribute to the top quark flavor changing neutral current. In this work, we perform an extensive investigation of the top quark rare three-body decays t → cV V (V = γ, Z, g) and t → cff (f = b, τ, µ, e) at one-loop level. Our results show that the branching ratios of t → cgg and t → cbb could reach O(10 −3 ) in the favorite parameter space of the littlest Higgs model with T-parity, which implies that these decays may be detectable at the LHC or ILC, while for the other decays, their rates are too small to be observable at the present or future colliders. PACS numbers: 14.65.Ha,12.60.-i, 12.15.Mm I. II.A BRIEF REVIEW OF THE LHT One of the major motivations for the little Higgs model [29,30] is to resolve the little hierarchy problem [31], in which the quadratic divergence of the Higgs mass term at one-loop level was canceled by the new diagrams with additional gauge bosons and a heavy top-quark partner. It was soon recognized that the scale of the new particles should be in the multi-TeV range in order to satisfy the constraints from electroweak precision measurements, which in turn reintroduces the little hierarchy problem [32]. This problem has been eased in the LHT model where a new Z 2 discrete symmetry called "T-parity" is introduced, and in this way, all dangerous tree level contribution to the precision measurements are forbidden [26].Just like the little Higgs model, in the LHT model the assumed global symmetry SU (5) is spontaneously broken down to SO(5) at a scale f ∼ O(T eV ), and the embedded [SU (2) ⊗ U (1)] 2 gauge symmetry is simultaneously broken at f to the diagonal subgroup SU (2) L ⊗ U (1) Y , which is identified with the SM gauge group.

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Section: Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revisiting rare top quark decays in the littlest Higgs Model with T-parity

Han

Yang

2016

Int. J. Mod. Phys. A

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Section: B Amplitude For T ! Cvv In the Lht Modelmentioning

confidence: 99%

“…cg,c, cZ, cH and the threebody decays t ! cl " l, (l ¼ b, , , e) have been studied in [27,28,28] respectively, and these studies show that, compared with the SM, the rates of these decays can be greatly enhanced. So taking the completeness and the phenomenon of higher-order dominance into consideration [14], it is necessary to consider all the three-body decays, which will be done in this work.…”

Section: Introductionmentioning

confidence: 99%

Top quark rare three-body decays in the littlest Higgs model withTparity

Han

Wang

2011

Phys. Rev. D

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“…For example, the two-Higgs doublet models (2HDM) [11][12][13][14][15][16], the minimal supersymmetric standard model (MSSM) [17][18][19][20][21][22][23][24][25][26][27][28], the littlest Higgs model with T-parity (LHT) [29][30][31], the left-right supersymmetric model [32], the topcolor-assisted technicolor model (TC2) [33],…”

Section: Introductionmentioning

confidence: 99%

Rare top quark decays in the minimal R-symmetric supersymmetric standard model

Sun¹,

Wang²,

Yang³

et al. 2023

Preprint

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The one-loop contributions to the flavor changing neutral current decays of the top quark into a light quark and a gauge boson or Higgs boson: t → qV, qh, with q = u or c, V = γ, g or Z, are analyzed in this work in the framework of the minimal R-symmetric supersymmetric standard model. The numerical results show that the gluino or ρ-chargino dominates the predictions on BR(t → qV, qh), and the contributions from neutralino or χ-chargino are insignificant. Taking account of the constraints on the squark mixing parameters from B → X s γ and B 0 d,s → µ + µ − , the theoretical predictions on BR(t → qg) can be enhanced to be O(10 −5 − 10 −6 ) and these two processes are very promising to be observed at the HL-LHC and FCC-hh. The values of BR(t → qγ, qZ, qh) are predicted to be, at least, four orders of magnitude below the present experimental bounds.

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Rare Top Decays in the Smallest Higgs Model With T-Parity

Cited by 6 publications

References 25 publications

Revisiting rare top quark decays in the littlest Higgs Model with T-parity

Revisiting rare top quark decays in the littlest Higgs Model with T-parity

Top quark rare three-body decays in the littlest Higgs model withTparity

Rare top quark decays in the minimal R-symmetric supersymmetric standard model

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