Updating neutrino magnetic moment constraints

被引：50

作者：

Canas, B. C. ^{[1
]}

Miranda, O. G. ^{[1
]}

Parada, A. ^{[2
]}

Tortola, M. ^{[3
]}

Valle, J. W. F. ^{[3
]}

机构：

[1] Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Apdo Postal 14-740, Mexico City 07000, DF, Mexico

[2] Univ Santiago Cali, Campus Pampalinda,Calle 5 6200, Santiago De Cali 760001, Colombia

[3] Univ Valencia, CSIC, Inst Fis Corpuscular, AHEP Grp, Parc Cient Paterna,C Catedrat Jose Beltran 2, E-46980 Paterna, Valencia, Spain

来源：

PHYSICS LETTERS B | 2016年 / 753卷

关键词：

ELECTROMAGNETIC PROPERTIES; MAJORANA NEUTRINOS; SOLAR NEUTRINOS; SCATTERING; REACTOR; DECAYS; MATTER;

D O I：

10.1016/j.physletb.2015.12.011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we provide an updated analysis of the neutrino magnetic moments (NMMs), discussing both the constraints on the magnitudes of the three transition moments Lambda(i) and the role of the CP violating phases present both in the mixing matrix and in the NMM matrix. The scattering of solar neutrinos off electrons in Borexino provides the most stringent restrictions, due to its robust statistics and the low energies observed, below 1 MeV. Our new limit on the effective neutrino magnetic moment which follows from the most recent Borexino data is 3.1 x 10(-11) mu(B) at 90% C.L. This corresponds to the individual transition magnetic moment constraints: vertical bar Lambda(1)vertical bar <= 5.6 x10(-11)mu(B), vertical bar Lambda(2)vertical bar <= 4.0 x10(-11)mu(B), and vertical bar Lambda(3)vertical bar <= 3.1 x10(-11)mu B(90% C. L.), irrespective of any complex phase. Indeed, the incoherent admixture of neutrino mass eigenstates present in the solar flux makes Borexino insensitive to the Majorana phases present in the NMM matrix. For this reason we also provide a global analysis including the case of reactor and accelerator neutrino sources, presenting the resulting constraints for different values of the relevant CP phases. Improved reactor and accelerator neutrino experiments will be needed in order to underpin the full profile of the neutrino electromagnetic properties. (C) 2015 The Authors. Published by Elsevier B. V.

引用

页码：191 / 198

页数：8

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