The latest results from atmospheric and accelerator neutrino experiments indicate that the normal neutrino mass ordering m_1〈 m_2〈 m_3, a maximal leptonic CP-violating phase δ = 270° and the second octant of n...The latest results from atmospheric and accelerator neutrino experiments indicate that the normal neutrino mass ordering m_1〈 m_2〈 m_3, a maximal leptonic CP-violating phase δ = 270° and the second octant of neutrino mixing angle θ_23〉 45° are favored. In light of new experimental results, we update previous phenomenological studies on two-zero textures of the Majorana neutrino mass matrix M-_ν, in the flavor basis where the charged-lepton mass matrix M_l is diagonal. When the 1σ ranges of neutrino mixing parameters are taken into account, only four（i.e., A_（1,2）and B_（2,4）） among seven two-zero patterns of Mνshow the aforementioned features of neutrino mass spectrum, mixing angle θ_23and CP-violating phase δ, and thus are compatible with the latest neutrino oscillation data. The correlative relations among neutrino masses and mixing parameters have been derived analytically for these four patterns, and the allowed regions of neutrino mixing angles and the CP-violating phase are also given. Possible realizations of four viable two-zero textures via non-Abelian discrete flavor symmetries are discussed.展开更多
基金Supported in part by the Innovation Program of the Institute of High Energy Physics(Y4515570UI)National Youth Thousand Talents Programthe CAS Center for Excellence in Particle Physics(CCEPP)
文摘The latest results from atmospheric and accelerator neutrino experiments indicate that the normal neutrino mass ordering m_1〈 m_2〈 m_3, a maximal leptonic CP-violating phase δ = 270° and the second octant of neutrino mixing angle θ_23〉 45° are favored. In light of new experimental results, we update previous phenomenological studies on two-zero textures of the Majorana neutrino mass matrix M-_ν, in the flavor basis where the charged-lepton mass matrix M_l is diagonal. When the 1σ ranges of neutrino mixing parameters are taken into account, only four（i.e., A_（1,2）and B_（2,4）） among seven two-zero patterns of Mνshow the aforementioned features of neutrino mass spectrum, mixing angle θ_23and CP-violating phase δ, and thus are compatible with the latest neutrino oscillation data. The correlative relations among neutrino masses and mixing parameters have been derived analytically for these four patterns, and the allowed regions of neutrino mixing angles and the CP-violating phase are also given. Possible realizations of four viable two-zero textures via non-Abelian discrete flavor symmetries are discussed.
