Higgs bosons from top quark decays

Han, Tao; Ruiz, Richard

doi:10.1103/physrevd.89.074045

Cited by 13 publications

(8 citation statements)

References 121 publications

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“…6(b) is only a few percent, the fact that top quarks are produced through strong interactions can lead to significant numbers of showered events at a hadron collider. On the other hand, the splitting rates to a Higgs boson are in sharp contrast to the much smaller rate for an on-shell top quark decay to a Higgs boson in the Standard Model [99], of the order 10 −9 .…”

Section: Ew Showers Initiated By Top Quarksmentioning

confidence: 84%

Electroweak splitting functions and high energy showering

Chen

Han

Tweedie

2017

J. High Energ. Phys.

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117

180

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Abstract:We derive the electroweak (EW) collinear splitting functions for the Standard Model, including the massive fermions, gauge bosons and the Higgs boson. We first present the splitting functions in the limit of unbroken SU(2) L × U(1) Y and discuss their general features in the collinear and soft-collinear regimes. These are the leading contributions at a splitting scale (k T ) far above the EW scale (v). We then systematically incorporate EW symmetry breaking (EWSB), which leads to the emergence of additional "ultra-collinear" splitting phenomena and naive violations of the Goldstone-boson Equivalence Theorem. We suggest a particularly convenient choice of non-covariant gauge (dubbed "Goldstone Equivalence Gauge") that disentangles the effects of Goldstone bosons and gauge fields in the presence of EWSB, and allows trivial book-keeping of leading power corrections in v/k T . We implement a comprehensive, practical EW showering scheme based on these splitting functions using a Sudakov evolution formalism. Novel features in the implementation include a complete accounting of ultra-collinear effects, matching between shower and decay, kinematic back-reaction corrections in multi-stage showers, and mixed-state evolution of neutral bosons (γ/Z/h) using density-matrices. We employ the EW showering formalism to study a number of important physical processes at O(1-10 TeV) energies. They include (a) electroweak partons in the initial state as the basis for vector-boson-fusion; (b) the emergence of "weak jets" such as those initiated by transverse gauge bosons, with individual splitting probabilities as large as O(35%); (c) EW showers initiated by top quarks, including Higgs bosons in the final state; (d) the occurrence of O(1) interference effects within EW showers involving the neutral bosons; and (e) EW corrections to new physics processes, as illustrated by production of a heavy vector boson (W ′ ) and the subsequent showering of its decay products.

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Section: Ew Showers Initiated By Top Quarksmentioning

confidence: 84%

Electroweak splitting functions and high energy showering

Chen

Han

Tweedie

2017

J. High Energ. Phys.

Self Cite

117

180

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“…The flavor-violating Higgs couplings involving a top quark in the SM, i.e., the vertex tqh (q = u, c), a e-mail: yanjuzhang@xxmu.edu.cn b e-mail: shjf@xxmu.edu.cn (corresponding author) are out of range for current LHC experimental sensitivities. While in some NP scenarios such as supersymmetry [5][6][7], two-Higgs-doublet model [8][9][10][11][12], 3-3-1 model [13], and other NP models by extending the Higgs sector [14,15], the branching ratios of top quark FCNC decays t → qh are predicted promisingly at the order of 10 −6 − 10 −3 . Thus searches for such FCNC processes are very important and could be considered as a clear signal for NP beyond the SM [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Probing anomalous tqh couplings via single top production in associated with the Higgs boson at the HE-LHC and FCC-hh

Zhang

Shen

2020

Eur. Phys. J. C

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We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) tqh couplings via the process pp → th at the proposed High Energy Large Hadron Collider (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh) including the realistic detector effects. The relevant SM backgrounds are considered in the cut based analysis to obtain the limits on the the branching ratios of t → qh (q = u, c), followed by the leptonic decay channel of the top quark and diphoton decay channel of the Higgs boson. The upper limits on the FCNC branching ratios at 95% confidence level (CL) and the 5σ discovery reach for the different integrated luminosities are obtained. It is shown that at the 27 TeV HE-LHC with an integrated luminosity of 15 ab −1 and at the 100 TeV FCC-hh with an integrated luminosity of 30 ab −1 , the BR(t → uh) (BR(t → ch)) can be probed, respectively, to 4.4 (6.4)×10 −5 and 1.3 (1.6)×10 −5 at the 95% CL.

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“…These include the decay modes t → sðdÞW þ , which contribute altogether less than one per mille to Γ t . In the case of three-body decay modes, such as t → bW þ ðγ; gÞ [6][7][8][9][10][11], t → bW þ Z [9][10][11][12][13][14][15], and t → bW þ H [9][10][11]14,16,17], the corresponding branching fractions (BR) are even smaller. Similarly, the flavor changing neutral currents modes t → cX (X ¼ γ; g; Z; H) [18][19][20]21], t → cW þ W − ðZZ; γγÞ [13,[22][23][24], and t → cl − l þ [25] have an extremely suppressed BR, although some of them involve very interesting dynamical mechanisms and have been suggested as possible probes of new physics; see for instance [26,27], which produces an enhancement on the BR that could make them detectable.…”

Section: Introductionmentioning

confidence: 99%

Lepton pair emission in the top quark decayt→bW+ℓ−ℓ+

Quintero¹,

Díaz-Cruz²,

Castro³

2014

Phys. Rev. D

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The heaviness of the top quark makes its two-body Cabibbo-favored decay mode t → bW þ to be dominant, at such a level that hardly any other decay mode reaches a detectable branching ratio within the Standard Model. Here we study the decay t → bW þ l − l þ (l ¼ e; μ; τ), which diverges for massless leptons, and it can reach a branching ratio ∼Oð10 −5 ∼ 10 −6 Þ for reasonable values of the low energy cut in the lepton pair invariant mass. This rate surpasses almost any other rare decays such as t → cX (X ¼ γ; Z; g; H; W þ W − ), and thus offers the possibility of being detectable. Furthermore, the estimate of this channel is relevant because it can mimic the signal arising from the lepton number violating decay t → bW − l þ l þ , when the W boson decays into lepton channels. 1 In numerical evaluations we use this value of the top quark mass.PHYSICAL REVIEW D 89, 093014 (2014) 1550-7998=2014=89(9)=093014 (5) 093014-1

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Higgs bosons from top quark decays

Cited by 13 publications

References 121 publications

Electroweak splitting functions and high energy showering

Electroweak splitting functions and high energy showering

Probing anomalous tqh couplings via single top production in associated with the Higgs boson at the HE-LHC and FCC-hh

Lepton pair emission in the top quark decayt→bW+ℓ−ℓ+

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