Muon conversion to electron in nuclei in type-I seesaw models
By R. Alonso, M. Dhen, B. Gavela, T. Hambye. 2012
178 citations recorded by the source corpus.
A bstractWe 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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/d13eb4a868b0329752b4280488d5ce482ed2881d
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In Nuclear and High Energy Physics
Citations in the corpus
- The Phenomenology of Right Handed Neutrinos (2013, methodology): “Searches for these processes in proposed experiments, such as COMET [112, 113] or Mu2e [114], can help to constrain RH neutrino properties [109].”
- Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, background): “The phenomenological implications of a non-unitary leptonic mixing matrix have been extensively studied in flavor and electroweak precision observables as well as in the neutrino oscillation phenomenon [363, 141, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 360, 53”
- Flavor structures of charged fermions and massive neutrinos (2019, background): “where xi ≡ m(2)i /M2 W 1 and x′ i ≡ M2 i /M2 W 1 (for i = 1, 2, 3), and Gγ(x) is the loop function which approaches x/4 for x 1 or 1/2 for x 1 [581, 582, 583].”
- A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “[392], present bounds and future sensitivity on |ki YΣiμYΣie | for scenarios characterized by one right-handed neutrino mass scale.”
- Lepton number and flavour violation in TeV-scale left-right symmetric theories with large left-right mixing (2013, background): “This approximation is not always valid for very large right-handed neutrino masses, in which case F(xi) ≃ ln(M(2) i /m2WL), but since the mixing scales with 1/Mi the rate will vanish in the decoupling limit [83].”
- A Call for New Physics : The Muon Anomalous Magnetic Moment and Lepton Flavor Violation (2016, background): “V n) + 9 8 37 s2 W 12 V(p) 2 W 16e D 3 8 V (n )+ 4s2 W 3 8 p 1 A: (201) Eq. (201) explicitly shows that dierent nuclei lead to a cancellation at dierent RH neutrino masses in agreement with [496]. Nevertheless, Eq. (201) is not so robust because there are uncertainties of the order of 10% surrou”