EFT approach to the electron electric dipole moment at the two-loop level

Panico, Giuliano; Pomarol, Alex; Riembau, Marc

doi:10.1007/jhep04(2019)090

J. High Energ. Phys.

2019

DOI: 10.1007/jhep04(2019)090

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EFT approach to the electron electric dipole moment at the two-loop level

Giuliano Panico

Alex Pomarol

Marc Riembau

Abstract: The ACME collaboration has recently reported a new bound on the electric dipole moment (EDM) of the electron, |d e | < 1.1 × 10 −29 e · cm at 90% confidence level, reaching an unprecedented accuracy level. This can translate into new relevant constraints on theories beyond the SM laying at the TeV scale, even when they contribute to the electron EDM at the two-loop level. We use the EFT approach to classify these corrections, presenting the contributions to the anomalous dimension of the CP-violating dipole op… Show more

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Cited by 96 publications

(122 citation statements)

References 85 publications

(115 reference statements)

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“…Here we focus on CP-even BSM physics, as CP-odd effects of this type are well constrained by measurements of anomalous dipole moments[30].…”

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confidence: 99%

Improved BSM sensitivity in diboson processes at linear colliders

2020

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We study W + W − and Zh final states at future linear e + e − colliders; designing analyses specific to the various final state polarizations allows us to target specific beyond the Standard Model (BSM) effects, parametrized in the form of dimension-6 operators. We find that CLIC can access effects roughly an order of magnitude smaller than HL-LHC or ILC, and two orders of magnitude smaller than LEP. These results are interpreted in the context of well-motivated BSM scenarios-at weak and strong coupling-where we expect correlated effects in Drell-Yann processes. The latter turn out to have better discovery potential, although the diboson processes provide additional discriminating power, potentially furnishing a way to measure the spin and coupling of BSM states. arXiv:1909.01937v1 [hep-ph] 4 Sep 2019 1 MotivationStandard Model (SM) precision tests are at the core of present and future collider programs. While interesting as confirmation of our unprecedented control of SM computations, they serve an exciting additional purpose: a way to search for new structure lurking beyond the SM (BSM). Indeed, heavy dynamics-beyond the direct reach of collidersleave an imprint on lower energy processes, in the form of deformations of SM interactions. These can be described by an Effective Field Theory (EFT), which parametrises the most general deviations from the SM and, at the same time, captures the effects of general, heavy BSM dynamics.The leading such effects, associated with dimension-6 operators in the effective Lagrangian, in general behave schematically as σ ∼ σ SM (1+E 2 /Λ 2 ), with E a characteristic energy scale of the process and Λ the physical scale associated with the EFT operator. This suggests two modes of exploration: i) on a SM resonance-such as the Z-pole studied at LEP1-where σ SM is maximal, statistical uncertainty the smallest, and the experiment becomes sensitive to tiny departures from the SM, or ii) at high-energy, where the BSM effect is larger and less precision is needed to access effects of a given size. In this article we focus on experiments of the latter type; in particular, we study non-resonant 2 → 2 processes, which are the simplest processes, with the largest cross sections, with access to the high-energy regime. Processes with more particles can be interesting to test operators with more legs, such as those that modify Higgs couplings [1].Particularly interesting for the BSM discovery potential they offer are diboson V V and V h (V ( ) = W, Z) final states. Indeed, new dynamics in the Higgs sector-such as Higgs compositeness [2-6]-alter the behaviour of V h processes [7-9] and, according to the equivalence theorem, also enter in processes with longitudinal V V [10][11][12]. BSM in the gauge sector [13,14] instead affects V V processes with transverse polarisations. Finally, light fermion substructure, as implied in models of fermion compositeness [15,16], can modify the initial light quark or lepton current, although this option seems to be disfavoured by tests of flavour and CP violatio...

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“…Here we focus on CP-even BSM physics, as CP-odd effects of this type are well constrained by measurements of anomalous dipole moments[30].…”

mentioning

confidence: 99%

Improved BSM sensitivity in diboson processes at linear colliders

2020

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“…Notice that in CHMs additional CP-violating interactions of the Higgs with the top and the top partners are typically present, which translate into strong bounds on the mass of the top partners and on their couplings[81,82]. These effects, however are independent with respect to the dynamics we are interested in for EWBG, so we can neglect them in our analysis.…”

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confidence: 99%

Composite dynamics in the early Universe

Curtis

Rose

Panico

2019

J. High Energ. Phys.

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We study the occurrence of a strong first-order electroweak phase transition in composite Higgs models. Minimal constructions realising this scenario are based on the coset SO(6)/SO(5) which delivers an extended Higgs sector with an additional scalar. In such models, a two-step phase transition can be obtained with the scalar singlet acquiring a vacuum expectation value at intermediate temperatures. A bonus of the Nambu-Goldstone boson nature of the scalar-sector dynamics is the presence of non-renormalisable Higgs interactions that can trigger additional sources of CP violation needed to realise baryogenesis at the electroweak scale. Another interesting aspect of this scenario is the generation of gravitational wave signatures that can be observed at future space-based interferometers.New physics models in which the Higgs boson arises as a pseudo Nambu-Goldstone Boson (NGB) from a strongly interacting theory can provide other natural scenarios in which first-order transitions can be obtained. The simplest models realising the idea of a NGB Higgs, the minimal Composite Higgs Models (CHMs) [21], are based on the symmetry breaking pattern SO(5) → SO(4), which delivers the four real scalar degrees of freedom that build-up a SM-like SU(2) Higgs doublet. In these scenarios the Higgs couplings are modified, but the strong experimental constraints already put an upper bound of order 10% on these deviations [22,23]. Moreover direct and indirect searches exclude additional composite resonances for masses below ∼ 1 TeV [24][25][26]. For these reasons the corrections to the Higgs thermal potential are necessarily small and can not convert the EWPhT into a strong first-order one.Successful CHMs exhibiting a first order EW transition can instead be realised by considering non-minimal symmetry-breaking patterns. A simple possibility, on which we will focus in this work, is provided by the coset SO(6)/SO(5) [27,28], in which the Higgs doublet is accompanied by an extra real scalar η. In this case the effective potential for the scalar fields allows for a much richer phase-transition behaviour. The EW transition may proceed directly from the symmetric phase to the EW-symmetry-breaking (EWSB) one or via some intermediate steps. The latter possibility is particularly interesting. As we will see, in a large part of the parameter space of the model, a two-step EWSB transition can be realised, in which the singlet gets a vacuum expectation value (VEV) at intermediate temperatures. In such case, the presence of a H 2 η 2 portal interaction creates a barrier between the EW vacuum and the intermediate vacuum, giving rise to a first-order transition that can be strong enough to allow for baryogenesis.Another interesting aspect of the composite scenario is the fact that the NGB nature of the Higgs implies the presence of non-renormalisable Higgs interactions that can provide additional sources of CP violation. As we will see, interactions of the form η ht L t R , are naturally there in SO(6)/SO(5) models and can trigger CP-violating effec...

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“…See also Ref [45]. for an analysis of the constraints from the results of the ACME collaboration[46].…”

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confidence: 99%

The minimal simple composite Higgs model

Rold

Rossia

2019

J. High Energ. Phys.

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Most of the analysis of composite Higgs have focussed on the Minimal Composite Higgs Model, based on the coset SO(5)×U(1) X /SO(4)×U(1) X . We consider a model based on the coset of simple groups SO(7)/SO(6), with SO(4)×U(1) X embedded into SO(6). This extension of the minimal model leads to a new complex pNGB that has hypercharge and is a singlet of SU(2) L , with properties mostly determined by the pattern of symmetry breaking and a mass of order TeV. Composite electroweak unification also leads to new bosonic and fermion resonances with exotic charges, not present in the minimal model, the lightest of these resonances being stable. A new rich phenomenology is expected at LHC. A The group SO(7) 32 B Mass matrices and form-factors in the 2-site theory 32 C Useful equations 35

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EFT approach to the electron electric dipole moment at the two-loop level

Cited by 96 publications

References 85 publications

Improved BSM sensitivity in diboson processes at linear colliders

Improved BSM sensitivity in diboson processes at linear colliders

Composite dynamics in the early Universe

The minimal simple composite Higgs model

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