Confronting Higgcision with electric dipole moments

Cheung, Kingman; Lee, Jae Sik; Senaha, Eibun; Tseng, Po-Yan

doi:10.1007/jhep06(2014)149

Cited by 72 publications

(70 citation statements)

References 148 publications

(175 reference statements)

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“…The bounds from the EDM constraints have been discussed in refs. [26,45] in CPV 2HDMs. In general, there are two sources which contribute to EDMs in CPV 2HDMs, namely, the modified couplings of the SM-like Higgs boson and contributions from additional Higgs bosons.…”

Section: Theoretical Boundsmentioning

confidence: 99%

CP violating Two-Higgs-Doublet Model: constraints and LHC predictions

Keus

King

Moretti

et al. 2016

J. High Energ. Phys.

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Two-Higgs-Doublet Models (2HDMs) are amongst the simplest extensions of the Standard Model. Such models allow for tree-level CP Violation (CPV) in the Higgs sector. We analyse a class of CPV 2HDM (of Type-I) in which only one of the two Higgs doublets couples to quarks and leptons, avoiding dangerous Flavour Changing Neutral Currents. We provide an up to date and comprehensive analysis of the constraints and Large Hadron Collider (LHC) predictions of such a model. Of immediate interest to the LHC Run 2 is the golden channel where all three neutral Higgs bosons are observed to decay into gauge boson pairs, W W and ZZ, providing a smoking gun signature of the CPV 2HDM.

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Section: Theoretical Boundsmentioning

confidence: 99%

CP violating Two-Higgs-Doublet Model: constraints and LHC predictions

Keus

King

Moretti

et al. 2016

J. High Energ. Phys.

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“…Our study is primarily motivated by the need to learn as much as possible in a model-independent way about the recently discovered Higgs, including its CP properties (for recent discussions of CP violation in the Higgs sector in the context of the Two-Higgs Doublet Model see refs. [24][25][26][27][28]). Moreover, CPV in the Higgs sector might have implications for weak scale baryogenesis in a number of scenarios beyond the SM (BSM).…”

Section: Jhep02(2016)011 1 Introductionmentioning

confidence: 99%

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Chien

Cirigliano

Dekens

et al. 2016

J. High Energ. Phys.

117

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Abstract:We investigate direct and indirect constraints on the complete set of anomalous CP-violating Higgs couplings to quarks and gluons originating from dimension-6 operators, by studying their signatures at the LHC and in electric dipole moments (EDMs). We show that existing uncertainties in hadronic and nuclear matrix elements have a significant impact on the interpretation of EDM experiments, and we quantify the improvements needed to fully exploit the power of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs interactions come from a combination of EDM measurements and the data from LHC Run 1. We argue that Higgs production cross section and branching ratios measurements at the LHC Run 2 will not improve the constraints significantly. On the other hand, the bounds on the couplings scale roughly linearly with EDM limits, so that future theoretical and experimental EDM developments can have a major impact in pinning down interactions of the Higgs.

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“…The measurement of the Higgs CP-properties therefore provides important information to solve the BAU puzzle. Motivated by this, the CP-properties of the Higgs boson discovered in 2012 [4] have been extensively studied by both theorists [5][6][7][8][9] and experimental groups [11] since its discovery [4], by using a method of direct measurements at the LHC. Given the limited statistics, however, the sensitivity of the LHC at this stage is still low.…”

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confidence: 99%

Cancellations Between Two-Loop Contributions to the Electron Electric Dipole Moment with aCP-Violating Higgs Sector

2015

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We present a class of cancellation mechanisms to suppress the total contributions of Barr-Zee diagrams to the electron electric dipole moment (eEDM). This class of mechanisms are of particular significance after the new eEDM upper limit, which strongly constrains the allowed magnitude of CP-violation in Higgs couplings and hence the feasibility of electroweak baryogenesis (EWBG), were released by the ACME collaboration in 2013. We point out: if both the CP-odd Higgs-photonphoton (Z boson) and the CP-odd Higgs-electron-positron couplings are turned on, a cancellation may occur either between the contributions of a CP-mixing Higgs boson, with the other Higgs bosons being decoupled, or between the contributions of a CP-even and a CP-odd Higgs bosons. With the assistance of the cancellation mechanisms, a large CP-phase in Higgs couplings with viable electroweak baryogenesis (EWBG) is still allowed. The reopened parameter regions would be probed by the future neutron, mercury EDM measurements, and direct measurements of Higgs CP-properties at the LHC and future colliders. INTRODUCTIONThe baryon asymmetry in the Universe (BAU) nowadays, i.e., [1,2] n b s ≈ (0.7 − 0.9) × 10 −10 = 0has puzzled people for more than half a century. Here s is entropy density of the Universe. Among various dynamical mechanisms to solve this puzzle, electroweak baryogenesis (EWBG) falls in the most popular class, due to its potential testability at the Large Hadron Collider and in the other experiments. A generic feature of the EWBG is that the CP phases employed to generate the cosmic baryon asymmetry need to enter the couplings between the Higgs sector and particles which either exist in the Standard Model (SM) or are introduced in new physics, no matter the CP-phases are flavor-diagonal, offdiagonal [3], or flavor-decoupled. Otherwise, these CPphases are decoupled from electroweak phase transition (EWPT) and the EWBG will never be implemented. The measurement of the Higgs CP-properties therefore provides important information to solve the BAU puzzle. Motivated by this, the CP-properties of the Higgs boson discovered in 2012 [4] have been extensively studied by both theorists [5][6][7][8][9] and experimental groups [11] since its discovery [4], by using a method of direct measurements at the LHC. Given the limited statistics, however, the sensitivity of the LHC at this stage is still low. On the other hand, fast progress has been made in indirect measurements. Using the polar molecule thorium monoxide (ThO), the ACME collaboration reported an upper limit on the eEDM recently [12] [56]at 90% confidence level, an order of magnitude stronger than the previous best limit. This limit severely constrains the allowed magnitude of CP-phases in the Higgs couplings [6-9] via Barr-Zee diagrams, causing a tension between the observation and the CP-phase required for successfully implementing EWBG (e.g., see [10] where the expected projection of the eEDM bounds to the EWBG in the MSSM was studied.) [57].In this letter we point out that in these studi...

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Confronting Higgcision with electric dipole moments

Cited by 72 publications

References 148 publications

CP violating Two-Higgs-Doublet Model: constraints and LHC predictions

CP violating Two-Higgs-Doublet Model: constraints and LHC predictions

Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Cancellations Between Two-Loop Contributions to the Electron Electric Dipole Moment with aCP-Violating Higgs Sector

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