Weak magnetic dipole moments in the MSSM

Carlos, B. de; Moreno, José Luís Muñoz

doi:10.1016/s0550-3213(98)00033-9

Cited by 8 publications

(14 citation statements)

References 29 publications

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“…Our results for the weak dipole moments can thus be easily generalized for arbitrary squared momentum q 2 ≡ s of the gauge boson by replacing x Z → s/m 2 S k in Eqs. (15) and (20). The electromagnetic dipole form factors follow easily after exchanging the Z couplings by the photon ones.…”

Section: B Behavior Of the Electromagnetic And Weak Properties Of Thmentioning

confidence: 99%

“…We also include the predictions of the MSSM. [20,21], the THDM [16,19], and unparticle physics (UP) [6]. due a chirality-flipping term proportional to the top quark mass, but such term is absent in the case of a chiral leptoquark and its contributions to the τ electromagnetic and weak properties are naturally suppressed.…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

“…For the F a and G a functions appearing in the fermion WEDM and WEDM of Eqs. (15) and (20) we obtain: F 1 (z 1 , z 2 , z 3 ) = 2 z 1 (4z 1 − z 3 ) 2 2 z 2 1 + (2z 2 − z 3 + 2) z 1 − 3 (z 2 − 1) 2 + (z 2 − 2) z 3 z 1 C 1 (z 1 , z 2 , z 3 ) + (2z 1 (z 1 − 5z 2 + 5) + (z 1 + z 2 − 1) z 3 ) ∆ 1 (z 1 , z 2 , z 3 ) + (4z 1 − z 3 ) ((z 2 − 1) ∆ 2 (z 1 , z 2 , z 3 ) + z 1 )) , (A1)…”

Section: Fermion Weak Dipole Momentsunclassified

“…The weak properties of a fermion have been studied in several SM extensions, such as models allowing treelevel flavor changing neutral currents [18], the two-Higgs-doublet model (THDM) [19], the minimal supersymmetric standard model (MSSM) [20], the minimal supersymmetric version of the SM with complex parameters [21], and in the context of unparticle physics [6]. Prompted by a recent work [22] on the study of the simplest renormalizable scalar leptoquark models with no proton decay (see also Ref.…”

Section: Introductionmentioning

confidence: 99%

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Static weak dipole moments of theτlepton via renormalizable scalar leptoquark interactions

2014

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The weak dipole moments of elementary fermions are calculated at the one-loop level in the framework of a renormalizable scalar leptoquark model that forbids baryon number violating processes and so is free from the strong constraints from experimental data. In this model there are two scalar leptoquarks accommodated in an SUL(2) × UY (1) doublet: one of such leptoquarks is non-chiral and has electric charge of 5/3e, whereas the other one is chiral and has electric charge 2/3e. In particular, a non-chiral leptoquark contributes to the weak properties of an up fermion via a chirality flipping-term proportional to the mass of the virtual fermion and can also induce a non-zero weak electric dipole moment provided that the leptoquark couplings are complex. The numerical analysis is focused on the weak properties of the τ lepton since they offer good prospects for their experimental study. The constraints on leptoquark couplings are briefly discussed for a non-chiral leptoquark with non-diagonal couplings to the second and third fermion generations, a third-generation non-chiral leptoquark, and a third-generation chiral leptoquark. It is found that although the chirality-flipping term can enhance the weak properties of the τ lepton via the top quark contribution, such an enhancement would be offset by the strong constraints on the leptoquark couplings. So, the contribution of scalar leptoquarks to the weak magnetic dipole moment of the τ lepton are smaller than the standard model (SM) contributions but can be of similar size than those arising in some SM extensions. A non-chiral leptoquark can also give contributions to the weak electric dipole moment larger than the SM one but well below the experimental limit. We also discuss the case of the off-shell weak dipole moments and for completeness analyze the behavior of the τ electromagnetic properties. * Email: gtv@fcfm.buap.mx 2

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Section: B Behavior Of the Electromagnetic And Weak Properties Of Thmentioning

confidence: 99%

Section: Conclusion and Final Remarksmentioning

confidence: 99%

Section: Fermion Weak Dipole Momentsunclassified

Section: Introductionmentioning

confidence: 99%

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Static weak dipole moments of theτlepton via renormalizable scalar leptoquark interactions

2014

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“…The theoretical predictions include the SM contributions corrected by higher-loop order electroweak radiative corrections and hadronic radiative corrections. Detailed calculations of the MSSM loop corrections are also currently available [148,149]. The recently reported measurement of the muon anomalous magnetic moment [150] exhibits a 2.5 σ deviation from the SM prediction [151], δa µ = (a µ ) EXP − (a µ ) SM = 42.6 (16.5) × 10 −10 .…”

Section: Anomalous Magnetic Dipole Momentsmentioning

confidence: 99%

Phenomenological constraints on broken R parity symmetry in supersymmetry models

Chemtob

2005

Progress in Particle and Nuclear Physics

157

113

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The R parity odd renormalizable Yukawa interactions of quarks and leptons with the scalar superpartners have the ability to violate the baryon and lepton numbers, change the hadron and lepton flavors and make the lightest supersymmetric particle unstable. The existence of an approximate R parity symmetry would thus affect in a deep way the conventional framework of the Minimal Supersymmetric Standard Model where an exact R parity symmetry is built-in by assumption. The purpose of the present review is to survey in a systematic way the direct experimental constraints set on the R parity violating couplings by the low and intermediate energy physics processes. We consider first the option of bilinear R parity violation and spontaneously broken R parity symmetry and proceed next to the trilinear R parity violating interactions. The discussion aims at surveying the indirect coupling constant bounds derived from fundamental tests of the Standard Model and the variety of scattering and rare decay processes. We also discuss the constraints imposed by the renormalization group scale evolution and the cosmological and astrophysical phenomenology. IntroductionThe multiplicative Z 2 symmetry, known as R parity, fulfills a central function in supersymmetry physics. Without R parity symmetry, the Minimal Supersymmetric Standard Model (MSSM) would include bilinear and trilinear renormalizable superpotential terms, coupling the quarks and leptons to their scalar superpartners, which have the ability to initiate fast nucleon decay, large neutrinos masses and the LSP (lightest supersymmetric particle) disintegration into ordinary particles. Thus apart from threatening the nucleon and neutrino stability and contributing to the hadron and lepton flavor changing processes and to neutrino masses and flavor mixing, the R parity odd Yukawa interactions would also disallow any of the supersymmetric cosmic relic particles to contribute to the Universe dark matter component. The R parity symmetry was first introduced in a 1978 work by Farrar and Fayet [1], as part of attempts towards building a realistic particle physics phenomenology of supersymmetry [2,3,4]. This step followed closely in time the major developments in years [1974][1975] which culminated in the construction of supersymmetric field theories [5,6,7], the implementation of spontaneous supersymmetry breaking schemes [8,9] and the discovery of R symmetries [10]. The collection of reprints by Ferrara [11] offers a valuable grasp on the progress of ideas from the early period until the middle 1980's. The subsequent developments are discussed in the review articles [12,13] and the collection of preprints by Salam and Sezgin [14]. As an historical aside on the origin of R symmetries, we note that Wess and Zumino [5] introduced an R quantum number as a weighting index labeling distinct representations of *

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Top dipole form factors and loop-induced CP violation in supersymmetry

et al. 1999

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The one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to the weak and electromagnetic dipole form factors of the top quark are presented. Far from the Z peak, they are not sufficient to account for all the new physics effects. In the context of the calculation of the process e^+e^- -> t tbar to one loop in the MSSM, we compare the impact on the phenomenology of the CP-violating dipole form factors of the top quark with the contribution from CP-violating box graphs. Some exemplificative observables are analyzed and the relevance of both the contributions is pointed out. The one-loop expressions for the electromagnetic and weak dipole form factors in a general renormalizable theory and the SM and MSSM couplings and conventions are also given

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Weak magnetic dipole moments in the MSSM

Cited by 8 publications

References 29 publications

Static weak dipole moments of theτlepton via renormalizable scalar leptoquark interactions

Static weak dipole moments of theτlepton via renormalizable scalar leptoquark interactions

Phenomenological constraints on broken R parity symmetry in supersymmetry models

Top dipole form factors and loop-induced CP violation in supersymmetry

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