Projected NA62 sensitivity to heavy neutral lepton production in K+ → π0e+ N decays

被引：11
|
作者：
Tastet, Jean-Loup [1 ]
Goudzovski, Evgueni [2 ]
Timiryasov, Inar [3 ]
Ruchayskiy, Oleg [1 ]
机构：
[1] Univ Copenhagen, Niels Bohr Inst, Blegdamsvej 17, DK-2010 Copenhagen, Denmark
[2] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[3] Ecole Polytech Fed Lausanne, Inst Phys, Lab Particle Phys & Cosmol, CH-1015 Lausanne, Switzerland
来源：
PHYSICAL REVIEW D | 2021年 / 104卷 / 05期
基金：
瑞士国家科学基金会; 欧洲研究理事会;
关键词：
DARK-MATTER; MASSES; SIMULATION; NEUTRINOS; VMSM;
D O I：
10.1103/PhysRevD.104.055005
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Heavy neutral leptons (HNLs) appear in many extensions of the Standard Model of particle physics. In this study, we investigate to which extent the NA62 experiment at CERN could improve the existing bounds on the HNL mixing angle vertical bar Ue vertical bar(2) by performing a missing mass search in K+ -> pi(0)e(+)N decays in flight. We show that the limit vertical bar Ue vertical bar(2) similar or equal to 2 x 10(-6) can be reached with the currently available data in the mass range 125-144 MeV, which is currently not well covered by production searches. Future data, together with a dedicated trigger and/or improvements in rejection of out-of-acceptance photons, can improve this limit by another order of magnitude.
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页数：7
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