Electron electric dipole moment as a sensitive probe of PeV scale physics

Ibrahim, Tarek; Itani, Ahmad; Nath, Pran

doi:10.1103/physrevd.90.055006

Cited by 33 publications

(38 citation statements)

References 71 publications

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“…Thus in this case all the mixing parameters, given in Eq. (13), are set to zero. The second analysis is for the MSSM extension where the mixings of the vectorlike generation with the three generations are switched on.…”

Section: The Analysis Of Electric Dipole Moment Operatormentioning

confidence: 99%

“…In view of this one could turn the indication of a large SUSY scale as a possible resolution of the EDM problem of supersymmetric models. In fact it has been suggested recently [10,11,12,13,14], that one can go further and utilize the current and future improved data on the EDM limits to probe mass scales far beyond those that may be accessible at colliders. We also note in passing that a large SUSY scale also helps suppress flavor changing neutral currents (FCNC) in supersymmetric models and helps stabilize the proton against rapid decay from baryon and lepton number violating dimension five operators in grand unified theories.…”

Section: Introductionmentioning

confidence: 99%

“…Further, a variety of grand unified models, string and D brane models contain vectorlike generations [17]. Vectorlike generations have been considered by several authors since their discovery would constitute new physics (see, e.g., [18,19,20,21,22,23,24,25,26,13,27,28,29,30]). …”

Section: Introductionmentioning

confidence: 99%

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Neutron electric dipole moment and probe of PeV scale physics

2015

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The experimental limit on the neutron electric dipole moment is used as a possible probe of new physics beyond the standard model. Within MSSM we use the current experimental limit on the neutron EDM and possible future improvement as a probe of high scale SUSY. Quantitative analyses show that scalar masses as large as a PeV and larger could be probed in improved experiment far above the scales accessible at future colliders. We also discuss the neutron EDM as a probe of new physics models beyond MSSM. Specifically we consider an MSSM extension with a particle content including a vectorlike multiplet. Such an extension brings in new sources of charge conjugation and parity (CP) violation beyond those in MSSM. These CP phases contribute to the EDM of the quarks and to the neutron EDM. These contributions are analyzed in this work where we include the supersymmetric loop diagrams involving the neutralinos, charginos, the gluino, squark and mirror squark exchange diagrams at the one loop level. We also take into account the contributions from the W , Z, quark and mirror quark exchanges arising from the mixings of the vectorlike generation with the three generations. It is shown that the experimental limit on the neutron EDM can be used to probe such new physics models. In the future one expects the neutron EDM to improve an order of magnitude or more allowing one to extend the probe of high scale SUSY and of new physics models. For the MSSM the probe of high scales could go up to and beyond PeV scale masses.

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Section: The Analysis Of Electric Dipole Moment Operatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron electric dipole moment and probe of PeV scale physics

2015

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“…These include a fine tuning of the phases to be small [24], suppression of the EDM by large sparticle masses [25], suppression of the EDM where various contributions conspire to cancel, i.e., the cancellation mechanism [26,27] as well as other possible remedies (see, e.g., [28]). It has also been suggested that the EDM be used as a probe of new physics beyond the standard model [29,30,31,18,32]. Specifically the experimental limits on the EDMs can be used as vehicles to probe a new physics regime not accessible otherwise to current and future detectors.…”

Section: Introductionmentioning

confidence: 99%

“…Further, vectorlike multiplets arise in a variety of settings such as in grand unified models and in string and D brane models [8,10,11]. Vectorlike generations have been considered by several authors since their discovery would constitute new physics (see, e.g., [9,10,11,12,13,14,15,16,17,18,19,20,21,22]). Such models have new sources of CP violation and thus can generate substantial size dipole operators.…”

Section: Introductionmentioning

confidence: 99%

Chromoelectric dipole moments of quarks in MSSM extensions

et al. 2015

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An analysis is given of the chromoelectric dipole moment of quarks and of the neutron in an MSSM extension where the matter sector contains an extra vectorlike generation of quarks and mirror quarks. The analysis includes contributions to the CEDM from the exchange of the W and the Z bosons, from the exchange of charginos and neutralinos and the gluino. Their contribution to the EDM of quarks is investigated. The interference between the MSSM sector and the new sector with vectorlike quarks is investigated. It is shown that inclusion of the vectorlike quarks can modify the quark EDMs in a significant way. Further, this interference also provides a probe of the vectorlike quark sector. These results are of interest as in the future measurements on the neutron EDM could see an improvement up to two orders of magnitude over the current experimental limits and provide an instrument for a further probe of new physics beyond the standard model.

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Supersymmetry after the Higgs

Nath

2015

Annalen der Physik

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A brief review is given of the implications of a 126 GeV Higgs boson for the discovery of supersymmetry. Thus a 126 GeV Higgs boson is problematic within the Standard Model because of vacuum instability pointing to new physics beyond the Standard Model. The problem of vacuum stability is overcome in the SUGRA GUT model but the 126 GeV Higgs mass implies that the average SUSY scale lies in the several TeV region. The largeness of the SUSY scale relieves the tension on SUGRA models since it helps suppress flavor changing neutral currents and CP violating effects and also helps in extending the proton life time arising from baryon and lepton number violating dimension five operators. The geometry of radiative breaking of the electroweak symmetry and fine tuning in view of the large SUSY scale are analyzed.Consistency with the Brookhaven g μ − 2 result is discussed. It is also shown that a large SUSY scale implied by the 126 GeV Higgs boson mass allows for light gauginos (gluino, charginos, neutralinos) and sleptons. These along with the lighter third generation squarks are the prime candidates for discovery at RUN II of the LHC. Implication of the 126 GeV Higgs boson for the direct search for dark matter is discussed. Also discussed are the sparticles mass hierarchies and their relationship with the simplified models under the Higgs boson mass constraint.In 2012 the Large Hadron Collider (LHC) made a landmark discovery of a new boson. Thus the CMS and AT-LAS collaborations discovered a boson with a mass of ∼126 GeV [1][2][3][4]. It is now confirmed that this newly discovered particle is the long sought after Higgs boson [5][6][7][8] which plays a central role in the breaking of the electroweak symmetry. While the observed particle is the last missing piece of the Standard Model there are strong indications that at the same time its discovery portends discovery of a new realm of physics specifically supersymmetry. Below we elaborate on this theme in further detail.The outline of the rest of the paper is as follows: In Section 1 we discuss the status of the Higgs boson in the Standard Model, the issue of vacuum instability and the need for new physics beyond the Standard Model. In Section 2 we consider the implications of a 126 GeV Higgs boson within the framework of supersymmetry and specifically in the framework of supergravity unified models. As is well known a 126 GeV Higgs boson within supersymmetry leads to a high SUSY scale M s with M s lying in the TeV region. On the other hand the Brookhaven g μ − 2 experiment [9] shows a 3σ deviation from the Standard Model prediction [10,11]. An effect of this size requires that the average scale of sparticle masses entering the loops in the supersymmetric electroweak correction to g μ − 2 be low, i..e, O(100) GeV. Assuming the 3σ effect is robust we discuss in Section 3 how to reconcile the high SUSY scale that is indicated by the 126 GeV Higgs boson mass with the low SUSY scale indicated by the Brookhaven experiment. In Section 4 we discuss the implications of the Higgs ...

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Electron electric dipole moment as a sensitive probe of PeV scale physics

Cited by 33 publications

References 71 publications

Neutron electric dipole moment and probe of PeV scale physics

Neutron electric dipole moment and probe of PeV scale physics

Chromoelectric dipole moments of quarks in MSSM extensions

Supersymmetry after the Higgs

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