Lepton-number-violating searches for muon to positron conversion

Berryman, Jeffrey M.; Gouvêa, André de; Kelly, Kevin J.; Kobach, Andrew

doi:10.1103/physrevd.95.115010

Cited by 27 publications

(45 citation statements)

References 38 publications

(73 reference statements)

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“…Finally, all the other quantities related to the phase-space and nuclear matrix elements are characterized by the energy scale Q, and the power of Q is determined by the requirement that the final expression has the mass dimension of a decay rate. By fitting the known nuclear matrix element of titanium for the long-range light neutrino exchange, the scale Q is estimated to be 15.6 MeV [72]. By a similar argument, the muon capture rate can be approximated as…”

Section: Jhep03(2017)103mentioning

confidence: 94%

“…More recently, there is some interest in the estimation of the sensitivity of the µ − -e + conversion in nuclei in the literature [71][72][73], given that the the sensitivity of this mode is expected to be increased greatly in the near future due to the tremendous experimental improvement in the similar µ − -e − conversion mode. Nowadays, the most stringent limit on this channel was set by the SINDRUM II Collaboration in 1998, with the 90% C.L.…”

Section: Jhep03(2017)103mentioning

confidence: 99%

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Large ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ oscillations from high-dimensional lepton number violating operator

Geng

Huang

2017

J. High Energ. Phys.

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It is usually believed that the observation of the neutrino-antineutrino (ν-ν) oscillations is almost impossible since the oscillation probabilities are expected to be greatly suppressed by the square of tiny ratio of neutrino masses to energies. Such an argument is applicable to most models for neutrino mass generation based on the Weinberg operator, including the seesaw models. However, in the present paper, we shall give a counterexample to this argument, and show that large ν-ν oscillation probabilities can be obtained in a class of models in which both neutrino masses and neutrinoless double beta (0νββ) decays are induced by the high-dimensional lepton number violating operator O 7 =ū R l c RL L H * d R + H.c. with u and d representing the first two generations of quarks. In particular, we find that the predicted 0νββ decay rates have already placed interesting constraints on the ν e ↔ν e oscillation. Moreover, we provide an UV-complete model to realize this scenario, in which a dark matter candidate naturally appears due to the new U(1) d symmetry.

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Section: Jhep03(2017)103mentioning

confidence: 94%

Section: Jhep03(2017)103mentioning

confidence: 99%

Large ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ oscillations from high-dimensional lepton number violating operator

Geng

Huang

2017

J. High Energ. Phys.

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“…Next-generation experiments like Mu2e, DeeMe, and COMET have the potential to be much more sensitive to µ − → e + -conversion. The authors of [18] naively estimated the future sensitivities of these experiments to be Mu2e: R Al For a recent, more detailed discussion, see [19].…”

mentioning

confidence: 99%

Accessible lepton-number-violating models and negligible neutrino masses

et al. 2019

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Lepton-number violation (LNV), in general, implies nonzero Majorana masses for the Standard Model neutrinos. Since neutrino masses are very small, for generic candidate models of the physics responsible for LNV, the rates for almost all experimentally accessible LNV observables -except for neutrinoless double-beta decay -are expected to be exceedingly small. Guided by effective-operator considerations of LNV phenomena, we identify a complete family of models where lepton number is violated but the generated Majorana neutrino masses are tiny, even if the new-physics scale is below 1 TeV. We explore the phenomenology of these models, including charged-lepton flavor-violating phenomena and baryon-number-violating phenomena, identifying scenarios where the allowed rates for µ − → e + -conversion in nuclei are potentially accessible to next-generation experiments. I. INTRODUCTIONLepton number and baryon number are, at the classical level, accidental global symmetries of the renormalizable Standard Model (SM) Lagrangian. * If one allows for generic non-renormalizable operators consistent with the SM gauge symmetries and particle content, lepton number and baryon number will no longer be conserved. Indeed, lepton-number conservation is violated by effective operators of dimension five or higher while baryon-number conservation (sometimes together with lepton number) is violated by effective operators of dimension six or higher. In other words, generically, the addition of new degrees-of-freedom to the SM particle content violates baryon-number and lepton-number conservation.Experimentally, in spite of ambitious ongoing experimental efforts, there is no evidence for the violation of leptonnumber or baryon-number conservation [5]. There are a few different potential explanations for these (negative) experimental results, assuming degrees-of-freedom beyond those of the SM exist. Perhaps the new particles are either very heavy or very weakly coupled in such a way that phenomena that violate lepton-number or baryon-number conservation are highly suppressed. Another possibility is that the new interactions are not generic and that lepton-number or baryon-number conservation are global symmetries of the Beyond-the-Standard-Model Lagrangian. Finally, it is possible that even though baryon number or lepton number are not conserved and the new degrees-of-freedom are neither weakly coupled nor very heavy, only a subset of baryon-number-violating or lepton-number-violating phenomena are within reach of particle physics experiments. This manuscript concentrates on this third option, which we hope to elucidate below.The discovery of nonzero yet tiny neutrino masses is often interpreted as enticing -but certainly not definitive! -indirect evidence for lepton-number-violating new physics. In this case, neutrinos are massive Majorana fermions and one can naturally "explain" why the masses of neutrinos are much smaller than those of all other known massive particles (see, for example, [6-8] for discussions of this point). Searches for th...

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“…Negative muons decay μ − → e − + νē + ν μ (electron, electron antineutrino, and mion neutrino) differently than positive muons μ + → e + + ν e + ν μ (positron, electron neutrino, and mion antineutrino(Hertenberger, Chen, & Dougherty, 1995; Mann & Prirnakoff, 1977). Charged lepton flavor violation (CLFV) is important in mion conversion to electron μ − → e − by the Fermi contact within CLFV interaction(Bertl et al, 2006;Uesaka, Kuno, Sato, Sato, & Yamanaka, 2018), or muon conversion into positron μ − → e +(Berryman, de Gouvêa, Kelly, & Kobach, 2017;Geib & Merle,…”

mentioning

confidence: 99%

Muon disrupts AKT hydrogen bond network in cancer

Radisavljevic

2018

Journal Cellular Physiology

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A cancer microenvironment generates strong hydrogen bond network system by the positive feedback loops supporting cancer complexity and robustness. Such network functions through the AKT locus generating high entropic energy supporting cancer metastatic robustness. Charged lepton particle muon follows the rule of Bragg effect during a collision with hydrogen network in cancer cells. Muon beam dismantles hydrogen bond network in cancer by the muon‐catalyzed fusion, leading to apoptosis of cancer cells. Muon induces cumulative energy appearance on the hydrogen bond network in a cancer cell with its fast decay to an electron and two neutrinos. Thus, muon beam, muonic atom, muon neutrino shower, and electrons simultaneously cause fast neutralization of the AKT hydrogen bond network by the conversion of hydrogen into deuterium or helium, inactivating the hydrogen bond networks and inducing failure of cancer complexity and robustness with the disappearance of a malignant phenotype.

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Lepton-number-violating searches for muon to positron conversion

Cited by 27 publications

References 38 publications

Large ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ oscillations from high-dimensional lepton number violating operator

Large ν ‐ ν ¯ $$ \nu \hbox{-} \overline{\nu} $$ oscillations from high-dimensional lepton number violating operator

Accessible lepton-number-violating models and negligible neutrino masses

Muon disrupts AKT hydrogen bond network in cancer

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