Lepton-number-violating four-body tau lepton decays

被引：32

作者：

Lopez Castro, G. ^{[1
]}

Quintero, N. ^{[1
]}

机构：

[1] Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Mexico City 07000, DF, Mexico

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 07期

关键词：

DOUBLE-BETA DECAY; NEUTRINO MASSES; MAJORANA NEUTRINOS; STERILE NEUTRINOS; DARK-MATTER; RARE; OSCILLATIONS; SYMMETRY; NONCONSERVATION; SCATTERING;

D O I：

10.1103/PhysRevD.85.076006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the four-body tau(+) -> nu(tau)l(+)l(+)X(-/+) decays where l = e or mu and X = pi, K, rho, and K* mesons. These decay processes violate the total lepton number (vertical bar Delta L vertical bar = 2) and can be induced by the exchange of Majorana neutrinos. We consider a scenario where these decays are dominated by the exchange of only one heavy neutrino, which produces an enhancement of the decay amplitude via the resonant mechanism. Searches for these novel decay channels with branching fractions sensitivities of O(10(-7)) can provide constraints on the parameter space of the Majorana neutrinos, which are stronger than the ones obtained from Delta L = 2 decays of charged pseudoscalar mesons.

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页数：6

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