Summary
The rare decay modes μ→eγ, μ→eγ, K+→π+μe and KL → μe are calculated in a model in which two heavy neutral leptons (M0, E0) have right-hand couplings to both muons and electrons. Form E=0.5 andm M=2.0 GeV we find B(μ→eγ)=1.3·10-9δ2,B(K+→π+μ+e-)=5.8·10-14δ2 andB(KL→μ+e-) = 4.8·10-12δ2, where σ=sin 2ω specifies the E0, M0 mixing. We verify that present limits on μe universality are not violated. We present expected production and decay characteristics of the new leptons, and discuss experimental possibilities for observation of gross electron and muon number violations.
Riassunto
Si calcolano i modi rari di decadimento μ → eγ, μ→eγ, K+→π+μe e KL → μe in un modello in cui due leptoni neutri pesanti (M0, E0) hanno accoppiamenti a destra rispetto sia ai muoni che agli elettroni. Perm E=0.5 em M=2 GeV si trova ,B(μ→eγ)=1.3·10-9δ2,B(K+→π+μ+e-)=5.8·10-14δ2 eB(KL→μ+e-) = 4.8·10-12δ2, dove σ=sin 2ω specifica la mescolanza tra E0 e M0. Si verifica che non siano violati i presenti limiti sull'universalità di μe. Si presentano le caratteristiche di produzione e di decadimento dei nuovi leptoni e si discutono le possibilità sperimentali per l'osservazione di violazioni grossolane del numero muonico e elettronico.
Резюме
Вычисляются редкие моды распадов μ → eγ, μ→eγ, K+→π+μe и KL→μe в модели, в которой два тяжелых нейтральных лептона (M0, E0) имеют правостороннюю связь и с мюонами и с электронами. Дляm E=0.5 иm M=2ГэВ мы находим B(μ→eγ)=1.3·10-9δ2,B(K+→π+μ+e-)=5.8·10-14δ2 иB(KL→μ+e-) = 4.8·10-12δ2, где σ=sin 2ω определяет E0, M0 смешивание. Мы проверяем, что существующие пределы на μ-e универсальность не нарушаются. Мы приводим результаты для ожидаемого рождения и характеристик распадов новых мезонов. Обсуждаются экспериментальные возможности для наблюдения нарушений суммарного числа электронов и мюонов.
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Reference
See, for example, the discussion and references inV. Barger andD. V. Nanopoulos:Phys. Lett.,63 B, 168 (1976);Nucl. Phys.,124 B, 426 (1977).
P. E. G. Baird, M. W. S. M. Brimicombe, G. J. Roberts, P. G. H. Sandars, D. N. Stacey, E. N. Fortson, L. Lewis, E. G. Lindahl andD. C. Soreide:Nature,264, 528 (1976).
T. P. Cheng andL-F. Li:Phys. Rev. Lett.,38, 381 (1977).
H. Williams: invited talk atBrookhaven Conference (1976).
S. T. Petcov: Dubna preprint E2-10176.
P. Fayet:Nucl. Phys.,78 B, 14 (1974).
J. Bjorken, K. Lane andS. Weinberg: SLAC PUB-1925 (1977).
J. Kim:Phys. Rev. D,14, 3000 (1976).
R. Schrock:Phys. Rev. D,9, 743 (1974);S. Y. Pi andJ. Smith:Phys. Rev. D,9, 1498 (1974);R. Bertlmann, H. Grosse andB. Lautrup:Nucl. Phys.,73 B, 523 (1974);M. A. Ahmed andG. G. Ross:Phys. Lett.,59 B, 293 (1975);N. Vasanti:Phys. Rev. D,13, 1889 (1976).
S. Parker, H. L. Anderson andC. Rey:Phys. Rev.,133, B 768 (1964).
K. Fujikawa andN. Kawamoto: INS Report 248 (1975).
M. Gaillard andB. Lee:Phys. Rev. D,10, 897 (1974);D. V. Nanopoulos andG. G. Ross:Phys. Lett.,56 B, 279 (1975).
J. Ellis, M. K. Gaillard andD. V. Nanopoulos:Nucl. Phys.,109 B, 213 (1976);E. Poggio andH. Schnitzer:Phys. Rev. D,15, 1973 (1977).
J. Bjorken andC. H. Llewellyn Smith:Phys. Rev. D,7, 887 (1973);K. Fujikawa:Phys. Lett.,62 B, 176 (1976).
A. Pais andS. Treiman:Phys. Lett.,35, 1206 (1975);L. Baulieu:Nucl. Phys.,122 B, 100 (1977).
R. Chan andG. Kane: Michigan preprint (1977).
J. Bjorken andS. Weinberg:Phys. Rev. Lett.,38, 622 (1977).
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Work supported in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation, and in part by the Energy Research and Development Administration under contract E(11-1)-881, COO-583.
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Barger, V., Nanopoulos, D.V. μ→eγ: Possible signature of heavy neutral leptons. Nuov Cim A 44, 303–317 (1978). https://doi.org/10.1007/BF02813399
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DOI: https://doi.org/10.1007/BF02813399