Exploring anomalous top-quark interactions via the final lepton in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>productions/decays at hadron colliders

Hioki, Zenrō; Ohkuma, Kazumasa

doi:10.1103/physrevd.83.114045

Cited by 24 publications

(31 citation statements)

References 58 publications

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“…(3) These couplings are subject to the usual constraints from top-quark pair production [8,9,10,11,12,13,16,17,18,19,20,14,15,21,22], but they also affect and can be constrained by Higgs production associated with a top-quark pair [23,24,25,26,32,31,30,29,28,27]. We compare the two types of constraints in Fig.…”

Section: Quark Anomalous Couplingsmentioning

confidence: 99%

Higgs production constraints on anomalous fermion couplings

Hayreter

Valencia

2016

Nuclear and Particle Physics Proceedings

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Certain anomalous fermion-gauge boson couplings, such as the flavor diagonal anomalous color magnetic (CMDM) and color electric (CEDM) dipole moments of quarks are not fully gauge invariant under the SM. Restoring gauge invariance with an elementary Higgs doublet implies that they also contribute to Higgs boson production at the LHC and we study the corresponding constraints that can be placed on them. In a similar manner we study the constraints that can be placed on the τ-lepton anomalous magnetic moment, electric dipole moment, weak dipole moments, and dimension eight gluonic couplings at the LHC.

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Section: Quark Anomalous Couplingsmentioning

confidence: 99%

Higgs production constraints on anomalous fermion couplings

Hayreter

Valencia

2016

Nuclear and Particle Physics Proceedings

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“…These couplings have been calculated at one-loop level in various new physics models such as MSSM [47], 2HDM [48,49], Little Higgs model [50,51] and in models with unparticles [52]. Top chromomagnetic and chromoelectric dipole moments have been examined in the past in the context of single-top production [53][54][55], top-pair production [16,[56][57][58][59][60][61][62][63][64][65][66], and top-pair plus jet production [67] at hadron colliders. Cheung [68] has used spin correlations in top-pair production at hadron colliders to probe top CMDM and CEDM.…”

Section: Jhep10(2015)180mentioning

confidence: 99%

“…The sensitivity of polar-angle distributions on the anomalous ttg couplings in top-pair production have been studied in detail in ref. [16,58,59] for the Tevatron, LHC7 and LHC14 where they find that the polar distribution of the charged lepton is quite sensitive at the Tevatron to anomalous ttg couplings but much less sensitive at the LHC in pair production of top quarks.…”

Section: Angular Distributions Of the Charged Leptonmentioning

confidence: 99%

Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in tW production at the Large Hadron Collider

Rindani

Sharma

Thomas

2015

J. High Energ. Phys.

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Abstract:We study the sensitivity of the Large Hadron Collider (LHC) to top quark chromomagnetic (CMDM) and chromoelectric (CEDM) dipole moments and W tb effective couplings in single-top production in association with a W − boson, followed by semileptonic decay of the top. The W t single-top production mode helps to isolate the anomalous ttg and W tb couplings, in contrast to top-pair production and other single-top production modes, where other new-physics effects can also contribute. We calculate the top polarization and the effects of these anomalous couplings on it at two centre-of-mass (cm) energies, 8 TeV and 14 TeV. As a measure of top polarization, we look at decay-lepton angular distributions in the laboratory frame, without requiring reconstruction of the rest frame of the top, and study the effect of the anomalous couplings on these distributions. We construct certain asymmetries to study the sensitivity of these distributions to top-quark couplings. We determine individual limits on the dominant couplings, viz., the real part of the CMDM Reρ 2 , the imaginary part of the CEDM Imρ 3 , and the real part of the tensor W tb coupling Ref 2R , which may be obtained by utilizing these asymmetries at the LHC. We also obtain simultaneous limits on pairs of these couplings taking two couplings to be non-zero at a time.

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“…In our analysis, we assume that there exist no new particles at any energy less than Λ. Based on this assumption and adopting the notations of our previous work [37,38,39], the effective Lagrangian for t → bW is expressed as…”

mentioning

confidence: 99%

Full analysis of general non-standard tbW couplings

Hioki

Ohkuma

2016

Physics Letters B

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Possible non-standard couplings which could contribute to the t -> b W process are studied based on the effective-Lagrangian approach. The corresponding effective Lagrangian consists of four kinds of dimension-6 effective operators, each of which has an independent coupling constant. In this analysis, all those couplings are treated as complex numbers and constraints on them are estimated by using recent experimental data from the LHC. We point out that the resultant constraints on those couplings are still not that strong because contributions from some couplings can work oppositely with each other.Comment: One comment and two related references added. Final version to appear in Phys.Lett.

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Exploring anomalous top-quark interactions via the final lepton intt¯productions/decays at hadron colliders

Cited by 24 publications

References 58 publications

Higgs production constraints on anomalous fermion couplings

Higgs production constraints on anomalous fermion couplings

Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in tW production at the Large Hadron Collider

Full analysis of general non-standard tbW couplings

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