Upper bounds on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>|</mml:mo><mml:mi>Δ</mml:mi><mml:mi>L</mml:mi><mml:mo>|</mml:mo><mml:mo>=</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>decays of baryons

A search for lepton flavor violating decays, K+ --> mu+ mu+ pi-, K+ --> e+ e+ pi-, K+ --> pi+ e+ mu-, K+ --> mu+ e+ pi-, and pi0 --> e+ mu-, was performed using the data collected in Experiment E865 at the Brookhaven Alternating Gradient Synchrotron. No signal was found in any of the decay modes. At the 90% confidence level, the branching ratios are less than 3.0x10(-9), 6.4x10(-10), 5. 2x10(-10), 5.0x10(-10), and 3.4x10(-9), respectively.

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“…(1)] is a factor of 50 000 better than the previous experimental bound. The implications of this result are discussed in [11].…”

mentioning

confidence: 86%

Search for Lepton Flavor Violation inK+Decays into a Charged Pion and Two Leptons

Appel¹,

Gs²,

Bassalleck³

et al. 2000

Phys. Rev. Lett.

110

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“…[376]; a recent dedicated search reporting a much improved limit is by the HyperCP experiment at Fermilab [377].…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…Numerically, however, the predicted mass hierarchy is in general somewhat too strong. Models with R-parity violation also predict observable lepton-number violating processes at possibly observable rates (e.g., [371,376,393]). …”

Section: Neutrino Masses From R-parity Violationmentioning

confidence: 99%

Theory of neutrinos: a white paper

et al. 2007

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During 2004, four divisions of the American Physical Society commissioned a study of neutrino physics to take stock of where the field is at the moment and where it is going in the near and far future. Several working groups looked at various aspects of this vast field. The summary was published as a main report entitled "The Neutrino Matrix" accompanied by short 50 page versions of the report of each working group. Theoretical research in this field has been quite extensive and touches many areas and the short 50 page report [1] provided only a brief summary and overview of few of the important points. The theory discussion group felt that it may be of value to the community to publish the entire study as a white paper and the result is the current article. After a brief overview of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, the white paper summarizes what can be learned about physics beyond the Standard Model from the various proposed neutrino experiments. It also comments on the impact of the experiments on our understanding of the origin of the matter-antimatter asymmetry of the Universe and the basic nature of neutrino interactions as well as the existence of possible additional neutrinos. Extensive references to original literature are provided.2

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“…Predicting rates for such decays is challenging, since they depend sensitively on details of the underlying dynamics of neutrino mixing and of the hadronic matrix element [6,7]. These rates are unconstrained by limits on 0 decays and by conversion rates of muons to electrons in nuclear interactions [8]. Limits have been set on such processes in D, B, and K decays at branching-ratio sensitivities ranging from 10 ÿ4 to 10 ÿ9 [9].…”

mentioning

confidence: 99%