Probing light top partners with CP violation

Panico, Giuliano; Riembau, Marc; Vantalon, T.

doi:10.1007/jhep06(2018)056

Cited by 17 publications

(19 citation statements)

References 120 publications

(238 reference statements)

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“…In extended Higgs models, the leading contribution arises from the two-loop level Barr-Zee type diagram [180][181][182][183][184][185][186][187][188][189][190][191][192][193][194]. For supersymmetric models, a large contribution is generated from the one-loop level diagram [11,[195][196][197][198][199][200][201][202][203][204][205], together with the two-loop level diagrams [11,[206][207][208][209][210][211][212][213].…”

Section: B Chiral Perturbation Analysismentioning

confidence: 99%

Nuclear electric dipole moment in the cluster model with a triton: Li7 and B11

2019

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We calculate the electric dipole moment (EDM) of the nuclei 7 Li and 11 B in the cluster model with α ( 4 He) and triton ( 3 H) clusters as degrees of freedom. The 7 Li and 11 B nuclei are treated in the two-and three-body problem, respectively, using the Gaussian expansion method, assuming the one meson exchange P, CP-odd nuclear forces. We find that 7 Li and 11 B have larger sensitivity to the CP violation than the deuteron. It is also suggested that the EDMs of 7 Li and 11 B, together with those of 6 Li, 9 Be and the 1/2 + 1 excited state of 13 C, obey an approximate counting rule accounting for the EDM of the cluster and the α − N polarization. We show their sensitivity on the hadronic level CP violation in terms of the chiral effective field theory, and discuss their role in probing new physics beyond the standard model.

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Section: B Chiral Perturbation Analysismentioning

confidence: 99%

Nuclear electric dipole moment in the cluster model with a triton: Li7 and B11

2019

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“…Here we only focus on the contributions to the EDMs caused by the running of the mixings. For other contributions which can potentially arise in composite Higgs models, see e.g [53]…”

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confidence: 99%

Electroweak phase transition and baryogenesis in composite Higgs models

Bruggisser

Harling

Matsedonskyi

et al. 2018

J. High Energ. Phys.

148

164

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We present a comprehensive study of the electroweak phase transition in composite Higgs models, where the Higgs arises from a new, strongly-coupled sector which confines near the TeV scale. This work extends our study in Ref. [1]. We describe the confinement phase transition in terms of the dilaton, the pseudo-Nambu-Goldstone boson of broken conformal invariance of the composite Higgs sector. From the analysis of the joint Higgs-dilaton potential we conclude that in this scenario the electroweak phase transition can naturally be first-order, allowing for electroweak baryogenesis. We then extensively discuss possible options to generate a sufficient amount of CP violation -another key ingredient of baryogenesis -from quark Yukawa couplings which vary during the phase transition. For one such an option, with a varying charm quark Yukawa coupling, we perform a full numerical analysis of tunnelling in the Higgsdilaton potential and determine regions of parameter space which allow for successful baryogenesis. This scenario singles out the light dilaton region while satisfying all experimental bounds. We discuss future tests. Our results bring new opportunities and strong motivations for electroweak baryogenesis.

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“…Subsequently, a variety of additional sources of EDMs were studied, such as 3-gluon operators [22] or two-loop diagrams mediated by electroweak bosons [23,24]. A variety of new physics scenarios have been shown to predict interesting EDMs, including: stops in SUSY [25]; electroweakinos in SUSY [26] and specifically split SUSY [27,28]; two Higgs doublet models [24,[29][30][31]; SUSY beyond the MSSM [32,33]; and fermionic top partners [34].Our goal in this paper is to give a brief survey of how theories of new physics are constrained by the ACME result, including a range of novel possibilities where an EDM is mediated by the charm or top quark. We begin in §2 by giving a general argument, based on effective field theory, for the range of mass scales that are probed by the EDM.…”

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confidence: 99%

Interpreting the electron EDM constraint

Cesarotti

Nakai

et al. 2019

J. High Energ. Phys.

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The ACME collaboration has recently announced a new constraint on the electron EDM, |d e |< 1.1×10 −29 e cm, from measurements of the ThO molecule. This is a powerful constraint on CP-violating new physics: even new physics generating the EDM at two loops is constrained at the multi-TeV scale. We interpret the bound in the context of different scenarios for new physics: a general order-of-magnitude analysis for both the electron EDM and the CP-odd electronnucleon coupling; 1-loop SUSY, probing sleptons above 10 TeV; 2-loop SUSY, probing multi-TeV charginos or stops; and finally, new physics that generates the EDM via the charm quark or top quark Yukawa couplings. In the last scenario, new physics generates a "QULE operator" (q f σ µνū f ) · ( σ µνē ), which in turn generates the EDM through RG evolution. If the QULE operator is generated at tree level, this corresponds to a previously studied leptoquark model. For the first time, we also classify scenarios in which the QULE operator is generated at one loop through a box diagram, which include SUSY and leptoquark models. The electron EDM bound is the leading constraint on a wide variety of theories of CP-violating new physics interacting with the Higgs boson or the top quark. We argue that any future nonzero measurement of an electron EDM will provide a strong motivation for constructing new colliders at the highest feasible energies. arXiv:1810.07736v1 [hep-ph] 17 Oct 2018 there are many motivations for searching for physics beyond the Standard Model, three of the most important are the matter-antimatter asymmetry of our universe, the existence of dark matter, and the fine-tuning puzzle of the Higgs boson mass. The matter-antimatter asymmetry clearly indicates a need for new CP-violating physics, which could first be detected through its indirect effect on the electron EDM. As we will discuss below, EDMs also have interesting connections with WIMP dark matter (in specific models) and with the fine-tuning problem.The possibility of testing heavy new physics through electric dipole moment measurements has been studied extensively; reviews include [11][12][13][14]. Here we attempt to briefly summarize some of the important history of the topic, with apologies for inevitable omissions. Some early theoretical studies of lepton EDMs appeared already in the 1970s [15,16]. Many of the early studies of CP violation in supersymmetric theories focused on the neutron EDM [17][18][19], but studies of the electron EDM in supersymmetry commenced [20] shortly after a suggestion of Gavela and Georgi that lepton EDMs could be effective probes of new physics [21]. Subsequently, a variety of additional sources of EDMs were studied, such as 3-gluon operators [22] or two-loop diagrams mediated by electroweak bosons [23,24]. A variety of new physics scenarios have been shown to predict interesting EDMs, including: stops in SUSY [25]; electroweakinos in SUSY [26] and specifically split SUSY [27,28]; two Higgs doublet models [24,[29][30][31]; SUSY beyond the MSSM [32,33]; and fermionic...

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Probing light top partners with CP violation

Cited by 17 publications

References 120 publications

Nuclear electric dipole moment in the cluster model with a triton: Li7 and B11

Nuclear electric dipole moment in the cluster model with a triton: Li7 and B11

Electroweak phase transition and baryogenesis in composite Higgs models

Interpreting the electron EDM constraint

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