Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCD

Drobnak, Jure; Fajfer, Svjetlana; Kamenik, Jernej F.

doi:10.1103/physrevlett.104.252001

Cited by 43 publications

(40 citation statements)

References 20 publications

(24 reference statements)

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“…The NLO QCD correction to Br(t → qh) is estimated as 10% according to the results of high order corrections to t → bW [82] and t → ch [83][84][85]. In some specific models, the left-handed coupling κ L tqh is not expected to be large because its relation with the CKM mixing parameter.…”

Section: Top-higgs Fcnc Interactionsmentioning

confidence: 99%

Enhancing thj production from top-Higgs FCNC couplings

2015

J. High Energ. Phys.

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Abstract:In this paper, we study the single top and Higgs associated production pp → thj in the presence of top-Higgs FCNC couplings at the LHC. Under the current constraints, we find that the full cross section of pp → thj can be sizably enhanced in comparison with the SM predictions at 8 and 14 TeV LHC. We further explore the observability of top-Higgs FCNC couplings through pp → t(→ b + ν )h(→ γγ)j and find that the branching ratios Br(t → qh), Br(t → uh) and Br(t → ch) can be respectively probed to 0.12%, 0.23% and 0.26% at 3σ sensitivity at 14 TeV LHC with L = 3000 fb −1 .

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Section: Top-higgs Fcnc Interactionsmentioning

confidence: 99%

Enhancing thj production from top-Higgs FCNC couplings

2015

J. High Energ. Phys.

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“…For more details, the readers are referred to Refs. [20,21,22,23] and [30,31], respectively. Table 1: Wilson coefficients at the scale µ = 4.45 GeV in the LL and the NLL order, using two-loop running for α s with the input parameters listed in the appendix.…”

Section: Theoretical Formalismmentioning

confidence: 99%

Anomalous tqγ coupling effects in exclusive radiative B-meson decays

Li¹,

Yang²,

Yuan³

2011

J. High Energ. Phys.

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The top-quark FCNC processes will be searched for at the CERN LHC, which are correlated with the B-meson decays. In this paper, we study the effects of top-quark anomalous interactions tqγ in the exclusive radiative B → K * γ and B → ργ decays. With the current experimental data of the branching ratios, the direct CP and the isospin asymmetries, bounds on the coupling κ γ tcR from B → K * γ and κ γ tuR from B → ργ decays are derived, respectively. The bound on |κ γ tcR | from B(B → K * γ) is generally compatible with that from B(B → X s γ). However, the isospin asymmetry ∆(K * γ) further restrict the phase of κ γ tcR , and the combined bound results in the upper limit, B(t → cγ) < 0.21%, which is lower than the CDF result. For real κ γ tcR , the upper bound on B(t → cγ) is about of the same order as the 5σ discovery potential of ATLAS with an integrated luminosity of 10 fb −1 .For B → ργ decays, the NP contribution is enhanced by a large CKM factor |V ud /V td |, and the constraint on tuγ coupling is rather restrictive, B(t → uγ) < 1.44 × 10 −5 . With refined measurements to be available at the LHCb and the future super-B factories, we can get close correlations between B → V γ and the rare t → qγ decays, which will be studied directly at the LHC ATLAS and CMS.

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“…Several related processes were also calculated to the same precision. For example, The NLO QCD corrections to the decays of the top quark through flavor-changing neutral interactions have been calculated in [34][35][36][37]; the NLO QCD corrections to the production of a single top quark associated with an up or charm quark were also calculated in [31]. Among these processes, the direct top quark production is the most sensitive to the anomalous couplings.…”

Section: 2)mentioning

confidence: 99%