Total nuclear capture rates for negative muons

Suzuki, Tatsuo; Measday, D.F.; Roalsvig, J. P.

doi:10.1103/physrevc.35.2212

Cited by 434 publications

(482 citation statements)

References 84 publications

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“…[26] and [27]. 1 An interaction of the lepton current with the axial quark current is also generated but negligible compared with the dominant coherent µ to e conversion, O(A) larger.…”

Section: Calculation Of the Ratesmentioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

173

175

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We compute the µ → e conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The results are compared with previous computations in the literature. We determine the definite predictions resulting for the ratios between the µ → e conversion rate for a given nucleus and the rate of two other processes which also involve a µ − e flavour transition: µ → eγ and µ → eee. For a quasi-degenerate mass spectrum of right-handed neutrino masses -which is the most natural scenario leading to observable rates-those ratios depend only on the seesaw mass scale, offering a quite interesting testing ground. In the case of sterile neutrinos heavier than the electroweak scale, these ratios vanish typically for a mass scale of order a few TeV. Furthermore, the analysis performed here is also valid down to very light masses. It turns out that planned µ → e conversion experiments would be sensitive to masses as low as 2 MeV. Taking into account other experimental constraints, we show that future µ → e conversion experiments will be fully relevant to detect or constrain sterile neutrino scenarios in the 2 GeV−1000 TeV mass range.

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“…[26] and [27]. 1 An interaction of the lepton current with the axial quark current is also generated but negligible compared with the dominant coherent µ to e conversion, O(A) larger.…”

Section: Calculation Of the Ratesmentioning

confidence: 99%

Muon conversion to electron in nuclei in type-I seesaw models

Alonso

Dhen

Gavela

et al. 2013

J. High Energ. Phys.

173

175

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“…At the low values of the squared momentum transfer relevant for the kinematics of the µ − e conversion process (q 2 ≃ −m 2 µ ), the matrix element of L ef f for a nuclear transition is dominated by the coherent nuclear charge associated with the vector current of the nucleon 12) which gives an enhanced contribution to the coherent nuclear transition. In practice only the appropriate nuclear form factor for the coherent contribution is needed.…”

Section: Coherent µ -E Conversionmentioning

confidence: 99%

μ-e conversion in nuclei and Z′ physics

1993

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Together with the existence of new neutral gauge bosons, models based on extended gauge groups (rank > 4) often predict also new charged fermions. A mixing of the known fermions with new states with exotic weak-isospin assignments (left-handed singlets and right-handed doublets) will induce tree level flavour changing neutral interactions mediated by Z exchange, while if the mixing is only with new states with ordinary weak-isospin assignments, the flavour changing neutral currents are mainly due to the exchange of the lightest new neutral gauge boson Z ′ . We show that the present experimental limits on µ − e conversion in nuclei give a nuclear-modelindependent bound on the Z-e-µ vertex which is twice as strong as that obtained from µ → eee. In the case of E 6 models these limits provide quite stringent constraints on the Z ′ mass and on the Z − Z ′ mixing angle. We point out that the proposed experiments to search for µ − e conversion in nuclei have good chances to find evidence of lepton flavour violation, either in the case that new exotic fermions are present at the electroweak scale, or if a new neutral gauge boson Z ′ of E 6 origin lighter than a few TeV exists.

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“…In the above equationτ µ corresponds to the lifetime of a muonic atom, which depends on the specific element, and is always smaller than the lifetime of free muons, τ µ (τ µ = 2.197×10 −6 s [59]). In table 4 we summarise the values ofτ µ for different elements [104], which will be relevant in our discussion. In eq.…”

Section: Jhep02(2016)083mentioning

confidence: 99%

Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion in nuclei CR(µ − e, N), the (Coulomb enhanced) decay of muonic atoms into a pair of electrons BR(µ − e − → e − e − , N), as well as Muonium conversion and decay, Mu − Mu and Mu → e + e − . Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model. In this work, we consider minimal extensions of the Standard Model via the addition of sterile fermions, providing the corresponding complete analytical expressions for all the considered observables. We first consider an "ad hoc" extension with a single sterile fermion state, and investigate its impact on the above observables. Two well motivated mechanisms of neutrino mass generation are then considered: the Inverse Seesaw embedded into the Standard Model, and the νMSM. Our study reveals that, depending on their mass range and on the active-sterile mixing angles, sterile neutrinos can give significant contributions to the above mentioned observables, some of them even lying within present and future sensitivity of dedicated cLFV experiments. We complete the analysis by confronting our results to other (direct and indirect) searches for sterile fermions.

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Total nuclear capture rates for negative muons

Cited by 434 publications

References 84 publications

Muon conversion to electron in nuclei in type-I seesaw models

Muon conversion to electron in nuclei in type-I seesaw models

μ-e conversion in nuclei and Z′ physics

Impact of sterile neutrinos on nuclear-assisted cLFV processes

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