Chromomagnetic dipole moment of the top quark revisited

Martı́nez, R.; Pérez, M. A.; Poveda, N.

doi:10.1140/epjc/s10052-007-0457-6

Cited by 53 publications

(64 citation statements)

References 59 publications

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“…The indirect bounds for the first four coefficients are taken from electroweak data [16], whereas the last three-C r bW [18], C r tB [19], and C r uGφ [20]-are taken from b → sγ measurements. Direct bounds come from measurements on the W helicity in top decays as well as single top production [21,22].…”

Section: Top-quark Production At the Lhecmentioning

confidence: 99%

ProbingttγandttZcouplings at the LHeC

Bouzas

Larios

2013

Phys. Rev. D

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We study the deep inelastic scattering and photo-production modes of tt pairs at the proposed LHeC and its potential to probe the electromagnetic and weak dipole moments (MDM and EDM for ttγ) of the top quark. A framework of eight independent gauge-invariant dimension-six operators involving the top quark and the electroweak gauge bosons is used. Four of these operators modify the charged tbW coupling which can be probed through the single (anti) top production mode as reported in the literature. One generates ttγ(Z) as well as tbW couplings, while the other two do not generate tbW but only ttγ(Z). Our focus is on the MDM and EDM of the top quark for which the photo-production mode of tt can be an excellent probe. At the proposed electron energies of E e = 60 and 140 GeV the LHeC could set constraints stronger than the indirect limits from b → sγ and the potential limits of the LHC through ttγ production.

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Section: Top-quark Production At the Lhecmentioning

confidence: 99%

ProbingttγandttZcouplings at the LHeC

Bouzas

Larios

2013

Phys. Rev. D

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“…[3]. The corrections calculated here and listed in Table II are labelled 'typical' as they can be pushed up by an order of magnitude by allowing couplings such as η U to be as large as their unitarity upper bound and/or considering lighter scalars which at the moment are not ruled out.…”

Section: Processmentioning

confidence: 99%

“…The size of these anomalous couplings has been considered in a variety of cases: 331 models, topcolor models and extra dimension models [3]; two Higgs doublet models [3,[31][32][33][34][35]; models with vector like multiplets [36]; and MSSM extensions [37]. Their one-loop value within the SM has also been computed in some cases [3,32], and it is known that the EDMs vanish at this order within the SM.…”

Section: Introductionmentioning

confidence: 99%

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Top and bottom tensor couplings from a color octet scalar

Martı́nez

Valencia

2017

Phys. Rev. D

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“…Top CMDM and CEDM couplings, which we study here, could arise in the SM or from new interactions at loop level. While the CP-conserving CMDM coupling can arise in the SM at one-loop [41], the CP-violating CEDM coupling can only be generated at 3-loop level in the SM [42][43][44][45][46]. 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].…”

Section: Jhep10(2015)180mentioning

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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Chromomagnetic dipole moment of the top quark revisited

Cited by 53 publications

References 59 publications

ProbingttγandttZcouplings at the LHeC

ProbingttγandttZcouplings at the LHeC

Top and bottom tensor couplings from a color octet scalar

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

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