LIMITS ON NEUTRINO MIXING WITH NEW HEAVY-PARTICLES

被引：122

作者：

NARDI, E

ROULET, E

TOMMASINI, D

机构：

[1] UNIV VALENCIA, DEPT FIS TEOR, VALENCIA, SPAIN

[2] CERN, DIV THEORY, CH-1211 GENEVA 23, SWITZERLAND

[3] IFIC, E-46100 BURJASSOT, SPAIN

来源：

PHYSICS LETTERS B | 1994年 / 327卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(94)90736-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the effects induced by new neutral fermions below their mass threshold, due to their possible mixing with the standard neutrinos. We use as experimental constraints the recent results on lepton universality, together with, the measurement of the mu decay rate and the updated LEP data. In particular, the inclusion in our data set of the most recent determinations of the tau branching fractions, mass and lifetime implies that a previous indication of a non-vanishing mixing for nu(tau) is no longer present. We obtain new stringent limits on the mixing parameters between nu(e), nu(mu), nu(tau) and heavy neutral states of different weak isospin. If no assumption on the type of neutrinos involved in the mixing is made, we find s(nu)e2 < 0.0071, s(nu)mu2 < 0.0014 and s(nu)tau2 < 0.033.

引用

页码：319 / 326

页数：8

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