Proposal to search for mu- N -&gt; e- N with a single event sensitivity below 10 -16

Carey, R.; Lynch, Kevin R.; Miller, J.; Roberts, B. L.; Marciano, W.; Semertzidis, Y. K.; Yamin, P.; Kolomensky, Yu. G.; Molzon, W. R.; Popp, J.; Ankenbrandt, C.

doi:10.2172/952028

Cited by 67 publications

(96 citation statements)

References 6 publications

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“…We conclude this discussion commenting about another interesting nuclear-assisted LFV process, which is a charge-changing reaction of the type [1,102]: 5) JHEP02 (2016)083 denoted µ − → e + conversion in nuclei. The final nucleus, which is different from the initial one -thus preventing a coherent enhancement -can be either in its ground state or in an excited one.…”

Section: Jhep02(2016)083mentioning

confidence: 86%

“…[1]). Numerous experiments have already set strong bounds on the corresponding rate [2][3][4], and the experimental sensitivity to CR(µ − e, N) is expected to significantly improve in the near future [5][6][7][8][9]. Recently, another interesting observable has been proposed [10], which is the Coulomb-enhanced decay of a muonic atom into a pair of electrons, µ − e − → e − e − .…”

Section: Jhep02(2016)083mentioning

confidence: 99%

“…At present, two projects are aiming at improving the current bounds, Mu2e (at Fermilab) [5] and COMET (J-PARC) [6,7], sharing several common features (nominal muon…”

Section: Muon-electron Conversionmentioning

confidence: 99%

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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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Section: Jhep02(2016)083mentioning

confidence: 86%

Section: Jhep02(2016)083mentioning

confidence: 99%

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Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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“…In particular, dipole-operator dominance implies CR(µ → e; Ti) ≃ 5 × 10 −3 BR(µ → eγ) and CR(µ → e; Al) ≃ 3 × 10 −3 BR(µ → eγ) [40,41,142,143]. Hence, if MEG discovers µ → eγ then µ → e conversion could be tested by the dedicated experiments planned at J-PARC [144] and Fermilab [145].…”

Section: Lepton Flavour Violationmentioning

confidence: 99%

Beyond the standard seesaw: neutrino masses from Kähler operators and broken supersymmetry

Brignole

Joaquim

Rossi

2010

J. High Energ. Phys.

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We investigate supersymmetric scenarios in which neutrino masses are generated by effective d = 6 operators in the Kähler potential, rather than by the standard d = 5 superpotential operator. First, we discuss some general features of such effective operators, also including SUSY-breaking insertions, and compute the relevant renormalization group equations. Contributions to neutrino masses arise at low energy both at the tree level and through finite threshold corrections. In the second part we present simple explicit realizations in which those Kähler operators arise by integrating out heavy SU(2) W triplets, as in the type II seesaw. Distinct scenarios emerge, depending on the mechanism and the scale of SUSY-breaking mediation. In particular, we propose an appealing and economical picture in which the heavy seesaw mediators are also messengers of SUSY breaking. In this case, strong correlations exist among neutrino parameters, sparticle and Higgs masses, as well as lepton flavour violating processes. Hence, this scenario can be tested at highenergy colliders, such as the LHC, and at lower energy experiments that measure neutrino parameters or search for rare lepton decays.

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“…The Mu2e Collaboration proposes to search for coherent, neutrinoless conversion of muons into electrons in the field of a nucleus, with single-event sensitivity of ~10 -17 , an improvement factor of 10,000 over existing limits [1,2]. The Mu2e apparatus, shown in Fig.…”

Section: Introductionmentioning

confidence: 99%