Generalized perturbations in neutrino mixing

被引：9
作者：
Liao, Jiajun [1 ,3 ]
Marfatia, D. [1 ,3 ]
Whisnant, K. [2 ,3 ]
机构：
[1] Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA
来源：
PHYSICAL REVIEW D | 2015年 / 92卷 / 07期
关键词：
SYMMETRY; MASS; OSCILLATIONS; FLAVOR; THETA(13); QUARK; MU;
D O I：
10.1103/PhysRevD.92.073004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We derive expressions for the neutrino mixing parameters that result from complex perturbations on (1) the Majorana neutrino mass matrix (in the basis of charged lepton mass eigenstates) and on (2) the charged lepton mass matrix, for arbitrary initial (unperturbed) mixing matrices. In the first case, we find that the phases of the elements of the perturbation matrix, and the initial values of the Dirac and Majorana phases, strongly impact the leading-order corrections to the neutrino mixing parameters and phases. For experimentally compatible scenarios wherein the initial neutrino mass matrix has mu - tau symmetry, we find that the Dirac phase can take any value under small perturbations. Similarly, in the second case, perturbations to the charged lepton mass matrix can generate large corrections to the mixing angles and phases of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix. As an illustration of our generalized procedure, we apply it to a situation in which nonstandard scalar and nonstandard vector interactions simultaneously affect neutrino oscillations.
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页数：13
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