Effects of universal extra dimensions on top-quark electromagnetic interactions

Montaño, J.; Novales‐Sánchez, H.; Toscano, J. J.

doi:10.1088/1361-6471/ab4d93

Cited by 6 publications

(10 citation statements)

References 156 publications

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“…The generation of the mass terms for zero modes in 5DQED is somewhat subtle. The problem has been addressed from two different, but equivalent, perspectives [7,20,21]. In one of these approaches, we start from the fact that QED is embedded in the electroweak theory and then we generate the mass of the zero mode via the Higgs mechanism [7,21].…”

Section: Qed With One Extra Dimensionmentioning

confidence: 99%

“…A comprehensive analysis on the matter is given in Refs. [7,20,21], so we restrict ourselves to present those results that are needed four our purposes. In the case of only one extra dimension there are no physical scalar fields.…”

Section: Qed With One Extra Dimensionmentioning

confidence: 99%

“…This is an effective field theory in 4 + n spacetime dimensions with an infinite number of Lagrangian terms, which include a replica of the 4-dimensional SM and the set of all interactions of higher-than-4 mass dimensions. At lower energies, when the finite size of the manifold N n is apparent, one needs to pass from the ISO(1, 3 + n) × SU C (3, M 4+n ) × SU L (2, M 4+n ) × U Y (1, M 4+n ) description, suitable for 4 + n dimensions, to the standard 4-dimensional description, provided by ISO(1, 3) × SU C (3, M 4 ) × SU L (2, M 4 ) × U Y (1, M 4 ), which is achieved through an appropriate compactification scheme, followed by two canonical transformations [6][7][8] that allow us to map covariant objects of the extended groups into covariant objects of the standard groups. The process of hiding the extended symmetry into the standard symmetry leads to an effective theory in which each SM field has an associated infinite set of Kaluza-Klein (KK) modes, which are quantized in the standard way [8].…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenological impact of 1 extra dimension on observables sensitive to new-physics effects has been a subject of interest in the literature. This is the case, for instance, of Higgs physics [9], flavor physics [7,10], the electroweak gauge sector [11], B physics [12], and collider physics [13,14]. All these investigations show that the one-loop contributions of the infinite number of KK modes lead to amplitudes free of divergences.…”

Section: Introductionmentioning

confidence: 99%

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Implications of extra dimensions on the effective charge and the beta function in quantum electrodynamics

et al. 2020

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A comprehensive analysis on the photon self-energy, the fermion self-energy, and the fermion vertex function is presented at one loop in the context of quantum electrodynamics (QED) with 1 extra dimension. In 5-dimensional theories, characterized by an infinite number of Kaluza-Klein fields, one-loop amplitudes involve discrete as well as continuous sums, ∞ n=1 d 4 k, that could diverge. Using dimensional regularization, we express such sums as products of gamma and Epstein functions, both defined on the complex plane, with divergences arising from poles of these functions in the limit as D → 4. Using the analytical properties of the Epstein function, we show that the ultraviolet divergences generated by the Kaluza-Klein sums can be consistently renormalized, which means that the corresponding renormalized quantities reduce to the usual ones of QED at the limit of a very large compactification scale R −1 . The main features of QED at the one-loop level were studied. We use the mass-dependent µ-scheme to calculate, in QED with an arbitrary number n of extra dimensions, a beta function fulfilling all desirable physical requirements. We argue that in this type of theories, with a large mass spectrum covering a wide energy range, beta functions should not be calculated by using mass-independent renormalization schemes. We show that the beta function is finite for any energy µ. In particular, it reduces to the usual QED result e 3 /12π 2 for m ≪ µ ≪ R −1 and vanishes for m ≫ µ, with m the usual fermion mass. Throughout the work, the decoupling nature of all our results obtained from the analytical properties of the Epstein function is stressed.

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Section: Qed With One Extra Dimensionmentioning

confidence: 99%

Section: Qed With One Extra Dimensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Implications of extra dimensions on the effective charge and the beta function in quantum electrodynamics

et al. 2020

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“…Detailed discussions on the role of the EHM in the Standard Model in universal extra dimensions and its associated KK theory can be found in Refs. [58,70]. Phenomenological investigations on Higgs physics in this extra-dimensional context have been carried out as well [53,[71][72][73][74][75].…”

Section: Introductionmentioning

confidence: 99%

Quark-flavor-changing Higgs decays from a universal extra dimension

Farrera¹,

Granados-González²,

Novales‐Sánchez³

et al. 2020

Preprint

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Kaluza-Klein fields characterizing, from a four-dimensional viewpoint, the presence of compact universal extra dimensions would alter low-energy observables through effects determined by some compactification scale, R −1 , since the one-loop level, thus being particularly relevant for physical phenomena forbidden at tree level by the Standard Model. The present paper explores, for the case of one universal extra dimension, such new-physics contributions to Higgs decays h (0) → qβ , into pairs of quarks with different flavors, a sort of decay process which, in the Standard Model, strictly occurs at the loop level. Finite results, decoupling as R −1 → ∞, are calculated. Approximate short expressions, valid for large compactification scales, are provided. We estimate that Kaluza-Klein contributions lie below predictions from the Standard Model, being about 2 to 3 orders of magnitude smaller for compactification scales within 1.4 TeV < R −1 < 10 TeV.

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Diphoton Higgs signal strength in universal extra dimensions

García-Jiménez

Montaño

Nápoles-Cañedo

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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The signal strength of the gg → H → γγ reaction in pp collisions at the Large Hadron Collider is studied within the context of the standard model with universal extra dimensions (UED). The impact of an arbitrary number n of UED on both the gg → H and H → γγ subprocesses is studied. The one-loop contribution of Kaluza–Klein excitations on these subprocesses are proportional to discrete and continuous sums, , which can diverge. By implementing the dimensional regularization scheme, it is shown that discrete regularized sums can naturally be expressed as multidimensional Epstein functions, and that divergences, if exist, emerge through the poles of these functions. It is found that continuous sums converge, but the discrete ones diverge, with the exception of the n = 1 case, in which the one-dimensional Epstein function converges. It is argued that divergences that arise from discrete sums for n ⩾ 2 are genuine ultraviolet divergences, since they correspond to short-distance effects in the compact manifold. Then, the amplitudes are renormalized in a modern sense by incorporating interactions of canonical dimension higher than four that allow us to generate the required counterterms, which are determined using a -like renormalization scheme. We find that the gg → H subprocess is quite sensitive to both the size and the dimension of the compact manifold, but the Standard Model prediction for H → γγ subprocess is practically unchanged. It is found that the experimental limit on leads to lower bounds for the compactification scale given by R−1 ⩾ 1.26, 1.55, 2.45, 3.57, 5.10, 7.25 TeVs for n = 1, 2, 4, 6, 8, 10, respectively.

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Effects of universal extra dimensions on top-quark electromagnetic interactions

Cited by 6 publications

References 156 publications

Implications of extra dimensions on the effective charge and the beta function in quantum electrodynamics

Implications of extra dimensions on the effective charge and the beta function in quantum electrodynamics

Quark-flavor-changing Higgs decays from a universal extra dimension

Diphoton Higgs signal strength in universal extra dimensions

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