Higgs boson production from gluon fusion in warped extra dimensions

Azatov, Aleksandr; Toharia, Manuel; Zhu, Lijun

doi:10.1103/physrevd.82.056004

Cited by 49 publications

(104 citation statements)

References 81 publications

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“…At about the same time, an independent analysis of the Higgs couplings to gluons and photons appeared [20], which reached the opposite conclusions. In a recent paper [23], it was shown that the discrepancy between the two sets of results can be traced back to a subtlety in the calculation of the loop-induced Higgs couplings to gluons and photons.…”

Section: Jhep01(2014)173mentioning

confidence: 86%

“…Precision measurements of the Higgs-boson couplings to SM particles, which are accessible via studies of both the Higgs production cross sections and its decay rates into various final states, present unique opportunities to test the SM description of electroweak symmetry breaking and search for indirect hints of new physics. In the context of warped extra dimensions, Higgs physics has been studied by several authors [14][15][16][17][18][19][20][21][22][23]. The effect on the gg → h amplitude caused by the heavy b ′ state, the SU(2) R partner of the top quark predicted in RS models with custodial symmetry, was investigated in [14].…”

Section: Jhep01(2014)173mentioning

confidence: 99%

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5D perspective on Higgs production at the boundary of a warped extra dimension

Malm

Neubert

Novotny

et al. 2014

J. High Energ. Phys.

108

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A comprehensive, five-dimensional calculation of Higgs-boson production in gluon fusion is performed for both the minimal and the custodially protected RandallSundrum (RS) model, with Standard Model fields propagating in the bulk and the scalar sector confined on or near the IR brane. For the first time, an exact expression for the gg → h amplitude in terms of the five-dimensional fermion propagator is derived, which includes the full dependence on the Higgs-boson mass. Various results in the literature are reconciled and shown to correspond to different incarnations of the RS model, in which the Higgs field is either localized on the IR brane or is described in terms of a narrow bulk state. The results in the two scenarios differ in a qualitative way: the gg → h amplitude is suppressed in models where the scalar sector is localized on the IR brane, while it tends to be enhanced in bulk Higgs models. In both cases, effects of higher-dimensional operators contributing to the gg → h amplitude at tree level are shown to be numerically suppressed under reasonable assumptions. There is no smooth cross-over between the two scenarios, since the effective field-theory description breaks down in the transition region. A detailed phenomenological analysis of Higgs production in various RS scenarios is presented, and for each scenario the regions of parameter space already excluded by LHC data are derived.

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Section: Jhep01(2014)173mentioning

confidence: 86%

Section: Jhep01(2014)173mentioning

confidence: 99%

5D perspective on Higgs production at the boundary of a warped extra dimension

Malm

Neubert

Novotny

et al. 2014

J. High Energ. Phys.

108

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“…The results should be in general consistent with the rough estimates of Eqs. (39) and (40). Some differences observed can nevertheless be explained, (see also [38]) so that one can still be confident in the generic size of the flavor violating couplings predicted in the flavor anarchy paradigm in RS type scenarios with four generations.…”

Section: Numerical Results For Higgs Fcnc Couplingsmentioning

confidence: 99%

“…As Higgs production can be modified within warped scenarios due to flavor violating effects in the Higgs sector [40], it may be possible to distinguish signals coming from a fourth generation model within the SM (SM4) with those coming from a fourth generation model associated with a warped extra-dimension (or a composite scenario), and, given the searches for the Higgs boson underway at the LHC, such an analysis is timely. The inclusion of the fourth generation will also affect low-energy precision observables, as well as limits on rare decays.…”

Section: Introductionmentioning

confidence: 99%

“…In a composite Higgs sector with strong dynamics, flavor changing neutral currents (FCNC) can arise at tree level, generated by a misalignment between the Higgs Yukawa matrices and the fermion mass matrices [36][37][38]. The full set of operators responsible for the misalignment has been thoroughly analyzed, showing that the effect is generically large and phenomenologically important [38] and even could alter considerably the couplings of Higgs to gluons [39,40], affecting thus the main production mechanism of the Higgs at hadron colliders.…”

Section: Introductionmentioning

confidence: 99%

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Higgs phenomenology in warped extra dimensions with a fourth generation

Frank¹,

Korutlu²,

Toharia³

2011

Phys. Rev. D

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We study a warped extra-dimension scenario where the Standard Model fields lie in the bulk, with the addition of a fourth family of fermions. We concentrate on the flavor structure of the Higgs couplings with fermions in the flavor anarchy ansatz. Even without a fourth family, these couplings will be generically misaligned with respect to the SM fermion mass matrices. The presence of the fourth family typically enhances the misalignment effects and we show that one should expect them to be highly non-symmetrical in the (34) inter-generational mixing. The radiative corrections from the new fermions and their flavor violating couplings to the Higgs affect negligibly known experimental precision measurements such as the oblique parameters and Z → bb or Z → µ + µ − .On the other hand, ∆F = 1, 2 processes, mediated by tree-level Higgs exchange, as well as radiative corrections to b → sγ and µ → eγ put some generic pressure on the allowed size of the flavor violating couplings. But more importantly, these couplings will alter the Higgs decay patterns as well as those of the new fermions, and produce very interesting new signals associated to Higgs phenomenology in high energy colliders. These might become very important indirect signals for these type of models as they would be present even when the KK mass scale is high and no heavy KK particle is discovered.

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Charming CP violation and dipole operators from RS flavor anarchy

Delaunay

Kamenik

Pérez

et al. 2013

J. High Energ. Phys.

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Recently the LHCb collaboration reported evidence for direct CP violation in charm decays. The value is sufficiently large that either substantially enhanced Standard Model contributions or non-Standard Model physics is required to explain it. In the latter case only a limited number of possibilities would be consistent with other existing flavorchanging constraints. We show that warped extra dimensional models that explain the quark spectrum through flavor anarchy can naturally give rise to contributions of the size required to explain the the LHCb result. The D meson asymmetry arises through a sizable CP-violating contribution to a chromomagnetic dipole operator. This happens naturally without introducing inconsistencies with existing constraints in the up quark sector. We discuss some subtleties in the loop calculation that are similar to those in Higgs to γγ. Loop-induced dipole operators in warped scenarios and their composite analogs exhibit non-trivial dependence on the Higgs profile, with the contributions monotonically decreasing when the Higgs is pushed away from the IR brane. We show that the size of the dipole operator quickly saturates as the Higgs profile approaches the IR brane, implying small dependence on the precise details of the Higgs profile when it is quasi IR localized. We also explain why the calculation of the coefficient of the lowest dimension 5D operator is guaranteed to be finite. This is true not only in the charm sector but also with other radiative processes such as electric dipole moments, b → sγ, / K and µ → eγ. We Open Access doi:10.1007/JHEP01(2013)027JHEP01 (2013)027 furthermore discuss the interpretation of this contribution within the framework of partial compositeness in four dimensions and highlight some qualitative differences between the generic result of composite models and that obtained for dynamics that reproduces the warped scenario.

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Higgs boson production from gluon fusion in warped extra dimensions

Cited by 49 publications

References 81 publications

5D perspective on Higgs production at the boundary of a warped extra dimension

5D perspective on Higgs production at the boundary of a warped extra dimension

Higgs phenomenology in warped extra dimensions with a fourth generation

Charming CP violation and dipole operators from RS flavor anarchy

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