نتایج جستجو برای: neutrino oscillation
تعداد نتایج: 57668 فیلتر نتایج به سال:
By using a fresh analysis of SN1987A data it is shown that mass of the electron neutrino is zero. The masses of other neutrino flavors are found to be non-zero. The neutrino astrophysics has been the subject of great interest for the last many decades. Since it was postulated in 1930, the properties of neutrino and in particular the question of its mass have gained much attention on both theore...
The reported signal at the LSND experiment, when interpreted as neutrino mixing with δm = 6 eV, provides evidence for neutrinos with a cosmologically significant mass. However, attempts to reconcile this interpretation of the experiment with other hints about neutrino properties require a (sterile) fourth neutrino and/or an “inverted” neutrino mass hierarchy. An interpretation of the LSND exper...
We find a grand unified SO(10) model which accommodates the bi-maximal neutrino mixing for vacuum-oscillation solutions to the atmospheric and the solar neutrino problems. This model maintains the original SO(10) mass relation between neutrino and up-type quark masses, mν2/mν3 ∼ (mc/mt). The recent data on the atmospheric neutrino from the SuperKamiokande (SuperK) Collaboration [1] have present...
We investigate the interference effects of non-standard neutrino matter interactions (NSNI) with the mass-induced neutrino oscillations. The NSNI is composed of flavor-changing neutrino interactions (FCNI) and flavor-diagonal neutrino interactions (FDNI). Both of the interactions are introduced in the νμ − ντ sector and the νe−νμ sector in order to study their effects in νμ → ντ and νμ → νe osc...
We propose a new approach to explore CPT violation of neutrino oscillation through a fluctuating matter based on time-dependent geometric quantities. By mapping the neutrino oscillation onto a Poincaré sphere structure, we obtain an analytic solution of master equation and further define the geometric quantities, i.e., radius of Poincaré sphere and geometric phase. We find that the mixing proce...
We present results for nu(mu) oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced nu(mu) beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of nu(mu), which we presume have oscillated to nu(tau). The probability that we would observe these results if ther...
An outline of the present and future long-baseline neutrino facilities with emphasis on the possibilities at CERN is presented. Accelerator-made neutrinos for long-baseline oscillation experiments open the exploration to a broad and rather interesting field of physics experiments, with the measurement of the neutrino mixing angle (θ13), the determination of the sign of neutrino mass hierarchy (...
We investigate the allowed ranges of masses for an unstable tau neutrino in the context of SO(10) GUT-s. In light of the new nucleosynthesis results we obtain that there is a narrow window for mντ where the LEP, neutrino oscillation and nucleosynthesis data are compatible. This window, which depends on the effective number of neutrinos contributing to nucleosynthesis, has important cosmological...
In the braneworld scenario, gravity and neutrino oscillation can both be used to detect the presence of an extra dimension. We argue that neutrino oscillation is particularly suitable if the size of the extra dimension is small, in which case the signature for the extra dimension is the disappearance of active neutrino fluxes into the bulk, caused by the destructive interference from the Kaluza...
We review the present status of global analyses of neutrino oscillations, taking into account the most recent neutrino data including the latest KamLAND and K2K updates presented at Neutrino2004, as well as state-of-the-art solar and atmospheric neutrino flux calculations. We give the two-neutrino solar + KamLAND results, and the two-neutrino atmospheric + K2K oscillation regions, discussing in...
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