The neutrino anomalies were driving force of the developments in neutrino physics during the last 30 35 years. I will consider status of the anomalies after the first KamLAND result. The main questions are “What is left?” and “What is the next?” In the new phase, the phenomenological objectives of neutrino physics consist of accomplishing the program of reconstruction of the neutrino mass and f...

In this document we will review the current status of reactor neutrino oscillation experiments and present their physics potentials for measuring the θ13 neutrino mixing angle. The neutrino mixing angle θ13 is currently a high-priority topic in the field of neutrino physics. There are currently three different reactor neutrino experiments, Double Chooz, Daya Bay and Reno and a few accelerator n...

The current neutrino oscillation theory asserts that neutrinos are massive subatomic particles, and can undergo their flavor oscillation. First in this article, we examine carefully the current oscillation theory, and argue that a massless neutrino oscillation mechanism based on the Weyl equations for neutrinos is also a feasible theory. This massless neutrino oscillation mechanism resolves bot...

The four light neutrino scenario, which explains the atmosphere, solar and LSND neutrino experiments, is studied in the framework of singular seesaw mechanism. By taking the Dirac neutrino mass matrix to be also singular, the right-handed neutrino Majorana mass can be at 1014 GeV scale. Abelian flavor symmetry is used to produce the required neutrino mass pattern. Maximal mixings between the νμ...

We examine how large CP and T -violation effects are allowed in long baseline neutrino experiments with three generations of neutrinos, considering both the solar neutrino deficit and the atmospheric neutrino anomaly. We considerd two cases: When we attribute only the atmospheric neutrino anomaly to neutrino oscillation and assume the constant transition probability of νe to explain the solar n...

We investigate the CP violation effect and the matter effect in the long-baseline neutrino oscillations in the four-neutrino model with mass scheme of the two pairs of two close masses separated by a gap of the order of 1 eV by using the constraints on the mixing matrix derived from the solar neutrino deficit, atmospheric neutrino anomaly, LSND experiments, and the other terrestrial neutrino os...

In astrophysical environments with intense neutrino fluxes, neutrino-neutrino forward scattering contributes both diagonal and off-diagonal potentials to the flavor-basis Hamiltonian that governs neutrino flavor evolution. We examine a special case where adiabatic flavor evolution can produce an off-diagonal potential from neutrino-neutrino forward scattering that dominates over both the corres...

We perform a dedicated study of the supernova (SN) neutrino flavor evolution during the accretion phase, using results from recent neutrino radiation hydrodynamics simulations. In contrast to what was expected in the presence of only neutrino-neutrino interactions, we find that the multiangle effects associated with the dense ordinary matter suppress collective oscillations. The matter suppress...

The three modified neutrino mass matrices in the SU(5) × U(2) model are studied focusing on the neutrino oscillation experiments. The model could be reconcile with the data of LSND. In the case of 〈φ1〉 6 = 0, the heaviest neutrino could be the hot dark matter; m3 ≥ 1eV, which means that CHORUS/NOMAD will find neutrino oscillations. In the special case of a = 1, which is a coefficient of 22 entr...

We present a general formalism for extracting information on the fundamental parameters associated with neutrino masses and mixings from two or more long baseline neutrino oscillation experiments. This formalism is then applied to the current most likely experiments using neutrino beams from the Japan Hadron Facility (JHF) and Fermilab’s NuMI beamline. Different combinations of muon neutrino or...