$$\mu \rightarrow e \gamma $$ μ → e γ in the 2HDM: an exercise in EFT

Davidson, Sacha

doi:10.1140/epjc/s10052-016-4076-y

Cited by 21 publications

(16 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(126-128) represent the exact results for the µ → eγ contribution in the 2HDM type III at the one-loop level. Our results are more general than those presented in [181] which focused on the decoupling limit, i.e. when sin β−α → 1.…”

Section: Resultssupporting

confidence: 43%

See 1 more Smart Citation

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

View full text Add to dashboard Cite

We review how the muon anomalous magnetic moment (g − 2) and the quest for lepton flavor violation are intimately correlated. Indeed the decay µ → eγ is induced by the same amplitude for different choices of in-and outgoing leptons. In this work, we try to address some intriguing questions such as:Which hierarchy in the charged lepton sector one should have in order to reconcile possible signals coming simultaneously from g − 2 and lepton flavor violation?What can we learn if the g − 2 anomaly is confirmed by the upcoming flagship experiments at FERMILAB and J-PARC, and no signal is seen in the decay µ → eγ in the foreseeable future? On the other hand, if the µ → eγ decay is seen in the upcoming years, do we need to necessarily observe a signal also in g − 2?.In this attempt, we generally study the correlation between these observables in a detailed analysis of simplified models. We derive master integrals and

show abstract

Section: Resultssupporting

confidence: 43%

“…There are caveats in our reasoning which are worth pointing out: There are two-loop diagrams which also yield sizable contributions for some regions of the parameter space involving quarks and gauge bosons, as already pointed out in [354][355][356] and discussed further in [181,[357][358][359] which may affect our results;…”

Section: Resultsmentioning

confidence: 81%

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

2018

View full text Add to dashboard Cite

show abstract

“…Our analysis extends [33] by including the one-loop RGE of vector operators, and the two-loop mixing of vectors to the dipoles, as well as the inclusion 1 For an analogous analysis in the quark sector see for example [29][30][31][32]. 2 Restricting to the SU (2)-invariant operators below mW fails to consider relevant contributions, as shown in [33,34]. of µ → e conversion and µ → 3e in the phenomenological analysis.…”

Section: Introductionmentioning

confidence: 99%

Renormalisation-group improved analysis of μ → e processes in a systematic effective-field-theory approach

Crivellin¹,

Davidson²,

Pruna³

et al. 2017

J. High Energ. Phys.

131

133

View full text Add to dashboard Cite

In this article, a complete analysis of the three muonic lepton-flavour violating processes µ → eγ, µ → 3e and coherent nuclear µ → e conversion is performed in the framework of an effective theory with dimension six operators defined below the electroweak symmetry breaking scale m W . The renormalisation-group evolution of the Wilson coefficients between m W and the experimental scale is fully taken into account at the leading order in QCD and QED, and explicit analytic and numerical evolution matrices are given. As a result, muonic decay and conversion rates are interpreted as functions of the Wilson coefficients at any scale up to m W . Taking the experimental limits on these processes as input, the phenomenology of the mixing effects is investigated. It is found that a considerable set of Wilson coefficients unbounded in the simplistic tree-level approach are instead severely constrained. In addition, correlations among operators are studied both in the light of current data and future experimental prospects.

show abstract

“…In the Higgs basis [21][22][23] in which only one doublet acquires a vacuum expectation value (using notation close to Ref. [24]) we have…”

Section: Type-iii 2hdmmentioning

confidence: 99%

Large h→bs in generic two-Higgs-doublet models

2018

View full text Add to dashboard Cite

We investigate the possible size of h → bs in two-Higgs-doublet models with generic Yukawa couplings. Even though the corresponding rates are in general expected to be small due to the indirect constraints from Bs → µ + µ − and Bs-Bs mixing, we find regions in parameter space where h → bs can have a sizable branching ratio well above 10%. This requires a tuning of the neutral scalar masses and their couplings to muons, but then all additional constraints such as B → Xsγ, (g − 2)µ, and h → µ + µ − are satisfied. In this case, h → bs can be a relevant background in h → bb searches and vice versa due to the imperfect b-tagging purity. Furthermore, if h → bs is sizeable, one expects two more scalar resonances in the proximity of m h . We briefly comment on other flavour violating Higgs decays and on the 95 GeV γγ resonance within generic two-Higgs-doublet models.1 Similar analyses were performed in the MSSM [8][9][10], also with additional vector-like fermions [11] and in 2HDMs with of type I and II [12], in aligned 2HDMs [13] as well as in Branco-Grimus-Lavoura [14] 2HDMs [15] and Zee models [16]. The correlations between h → bs and Bs → µ + µ − were considered in Ref. [17].

show abstract

$$\mu \rightarrow e \gamma $$ μ → e γ in the 2HDM: an exercise in EFT

Cited by 21 publications

References 42 publications

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

A call for new physics: The muon anomalous magnetic moment and lepton flavor violation

Renormalisation-group improved analysis of μ → e processes in a systematic effective-field-theory approach

Large h→bs in generic two-Higgs-doublet models

Contact Info

Product

Resources

About