MiniBooNE anomaly, the decay Ds+ → μ+νμ and heavy sterile neutrino

被引：29

作者：

Gninenko, S. N. ^{[1
]}

Gorbunov, D. S. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 07期

基金：

俄罗斯基础研究基金会;

关键词：

GENERAL-THEORY; SEARCH; LEPTONS; BOUNDS; MASSES; TESTS;

D O I：

10.1103/PhysRevD.81.075013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It has been recently suggested that the anomalous excess of low-energy electronlike events observed by the MiniBooNE experiment could be explained by the radiative decay of a heavy sterile neutrino nu(h) of the mass around 500 MeV with a muonic mixing strength in the range vertical bar U-mu h vertical bar(2) similar or equal to (1-4) x 10(-3). If such nu(h) exists its admixtures in the decay D-s(+) -> mu(+)nu(mu) would result in the decay D-s(+) -> mu(+)nu(h) with the branching fraction Br(D-s(+) -> mu(+)nu(h)) similar or equal to (1.2-5.5) x 10(-4), which is in the experimentally accessible range. Interestingly, the existence of the D-s(+) -> mu(+)nu(h) decay at this level may also explain why the currently measured decay rate of D-s(+) -> mu(+)nu(h) is slightly higher than the predicted one. This enhances motivation for a search for this decay mode and makes it interesting and complementary to neutrino experiments probing sterile-active neutrino mixing. Our estimates show that the sensitive search could be performed with the analysis of existing data, e. g. from the CLEO-c or another analogous experiment. The discrepancy between the measurements and theoretical description of the decay D-s(+) -> tau(+)nu(tau) is also briefly discussed.

引用

页数：5

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