Search for the rare decays K+ → μ+ X in E949 experiment

被引：0
|
作者：
Shaikhiev, A. T. [1 ]
机构：
[1] RAS, Inst Nucl Res, 60 October Revolut Pr 7a, Moscow 117312, Russia
来源：
X INTERNATIONAL CONFERENCE ON KAON PHYSICS | 2017年 / 800卷
基金：
加拿大自然科学与工程研究理事会; 俄罗斯科学基金会; 中国国家自然科学基金;
关键词：
DARK-MATTER; NEUTRINOS; VMSM;
D O I：
10.1088/1742-6596/800/1/012020
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The existence of a heavy neutrino, v(H), in the K+ -> mu(+) v(H) decays was tested using the E949 experimental data with an exposure of 1.70 x 10(12) stopped kaons. The allowed heavy neutrino mass region for the analysis is from 175 MeV/c(2) to 300 MeV/c(2). With major background from the radiative K+ -> mu(+)v(mu gamma) decay understood and suppressed, the preliminary new upper limits (90% C.L.) on the neutrino mixing matrix element between muon and heavy neutrino, vertical bar U mu H vertical bar(2), were set at the level of 10(-8) to 10(-9). New limit on the K+ -> mu(+)v (v) over barv branching ratio assuming Standard Model muon spectrum is set to be 2.4 x 10(-6).
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页数：6
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