Improved limit on the branching ratio of μ−→e+ conversion on titanium

Kaulard, J.; Dohmen, C.; Haan, H.; Honecker, W.; Junker, D.; Otter, G.; Starlinger, M.; Wintz, P.; Hofmann, J. I.; Bertl, W.; Egger, J.; Krause, B.; Eggli, S.; Engfer, R.; Findeisen, C.; Hermes, E.A.; Kozłowski, T.; Niebuhr, C.; Rutsche, M.; Pruys, H.; Schaaf, A. van der

doi:10.1016/s0370-2693(97)01423-8

Cited by 105 publications

(77 citation statements)

References 11 publications

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“…The current most stringent experimental bounds are coming from measurements using Au and Ti atoms [72,73] BR(µ → e in Au) < 7 × 10 −13 @ 90% C.L. , (5.9) and can be translated into bounds on the combinations of couplings, which enter (5.8).…”

Section: Lepton Flavor Violationmentioning

confidence: 99%

Exotic leptons: Higgs, flavor and collider phenomenology

Altmannshofer

Bauer

Carena

2014

J. High Energ. Phys.

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We study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h → γγ decay rate for new lepton masses in the 300 GeV-1 TeV range. We analyze vacuum stability implications for different hypercharges. Effects in h → Zγ are typically much smaller than in h → γγ, but distinct among the considered hypercharge assignments. Nonstandard hypercharges constrain or entirely forbid possible mixing operators with standard model leptons. As a consequence, the leading contributions to the experimentally strongly constrained electric dipole moments of standard model fermions are only generated at the two loop level by the new CP violating sources of the considered setups. We derive the bounds from dipole moments, electro-weak precision observables and lepton flavor violating processes, and discuss their implications. Finally, we examine the production and decay channels of the vector-like leptons at the LHC, and find that signatures with multiple light leptons or taus are already probing interesting regions of parameter space.

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Section: Lepton Flavor Violationmentioning

confidence: 99%

Exotic leptons: Higgs, flavor and collider phenomenology

Altmannshofer

Bauer

Carena

2014

J. High Energ. Phys.

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“…Future sensitivity µ − → e − γ 1.2 × 10 −11 [35] 10 −14 [36] τ − → µ − γ 6.8 × 10 −8 [37] 10 −9 [38] τ − → e − γ 1.1 × 10 −7 [39] 10 −9 [38] µ − → e − e + e − 1.0 × 10 −12 [40] 10 −14 [41] τ − → µ − µ + µ − 1.9 × 10 −7 [42] 10 −9 [38] τ − → µ − e + e − 1.9 × 10 −7 [43] 10 −9 [38] τ − → e − e + e − 2.0 × 10 −7 [44] 10 −9 [38] τ − → e − µ + µ − 3.3 × 10 −7 [44] 10 −9 [38] CR(µ → e ; Ti ) 1.7 × 10 −12 [45] 10 −18 [46] Table 1: Present limits and future sensitivities for the branching ratios (BR) of several LFV processes. The bound on the µ → e conversion rate (CR) in Ti is also shown.…”

Section: Br Present Limitsmentioning

confidence: 99%

Phenomenology of the triplet seesaw mechanism with gauge and Yukawa mediation of SUSY breaking

Joaquim

Rossi

2007

Nuclear Physics B

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We thoroughly discuss a new supersymmetric grand unified scenario of the triplet seesaw mechanism where the exchange of heavy SU (2) W triplet states generates both neutrino masses and soft supersymmetry breaking terms. This framework, recently proposed by us in a previous work, is highly predictive since it contains only three free parameters connecting low-energy neutrino parameters, lepton and quark flavour violation, sparticle and Higgs boson spectra and electroweak symmetry breakdown. These three parameters are the triplet mass M T , the effective supersymmetry breaking scale B T and a coupling constant λ. We perform a complete analysis of the parameter space taking into account the present experimental constraints and considering different types of neutrino spectrum. A special emphasis is given to the particular features of the sparticle and Higgs spectra and to the model independent predictions obtained for the processes µ → eX, µ → e conversion in nuclei, τ → eY and τ → µY (X = γ, ee, Y = γ, ee, µµ). In the appendices, we present some technical aspects relevant for our analysis.

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“…The alternate dominance of theB and the chargino contributions according to the value of M 2 1 /m 2 R is again quite evident. Some of the previous analysis have only considered the chargino part of the SU (2) contribution [28,27] The chargino dominance when |µ| is smaller than the slepton masses is an interesting feature since the other mass misalignments leading to LFV, δ RR and δ LR are not as effective for this mass 3 Actually, µ − e conversion in nuclei (see for instance [24] and references therein) also gives a bound [25] on µ → eγ. There is a proposal to achieve a precision at the level of 10 −16 in µ − e conversion [26], which would imply a really strong limit on the flavour dependence of the left-handed sleptons, comparable to BR(µ → eγ) at the level of 10 −14 .…”

Section: Llmentioning

confidence: 99%

Sleptonarium (Constraints on the CP and flavour pattern of scalar lepton masses)

Masina¹,

Savoy²

2003

Nuclear Physics B

153

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The constraints on the flavour and CP structure of scalar lepton mass matrices are systematically collected. The display of the resulting upper bounds on the lepton -slepton misalignment parameters is designed for an easy inspection of very large classes of models and the formula are arranged so as to suggest useful approximations. Interferences among the different contributions to lepton flavour violating transitions and lepton electric and magnetic dipole moments of generic character can either tighten or loose the bounds. A combined analysis of all rare leptonic transitions can disentangle the different contributions to yield hints on several phenomenological issues. The possible impact of these results on the study of the slepton misalignment originated in the seesaw mechanism and grand-unified theories is emphasized since the planned experiments are getting close to the precision required in such tests. *

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Improved limit on the branching ratio of μ−→e+ conversion on titanium

Cited by 105 publications

References 11 publications

Exotic leptons: Higgs, flavor and collider phenomenology

Exotic leptons: Higgs, flavor and collider phenomenology

Phenomenology of the triplet seesaw mechanism with gauge and Yukawa mediation of SUSY breaking

Sleptonarium (Constraints on the CP and flavour pattern of scalar lepton masses)

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