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19 papers found.
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An effective two-flavor approximation for neutrino survival probabilities in matter

It is known in vacuum that the three-flavor neutrino survival probability can be approximated by the effective two-flavor form to first orders in ϵ≡Δm 21 2 /Δm 31 2 , with introduction of the effective Δm αα 2 (α = e, μ, τ), in regions of neutrino energy E and baseline L such that Δm 31 2 L/2E ∼ π. Here, we investigate the question of whether the similar effective two-flavor...

A framework for testing leptonic unitarity by neutrino oscillation experiments

If leptonic unitarity is violated by new physics at an energy scale much lower than the electroweak scale, which we call low-scale unitarity violation, it has different characteristic features from those expected in unitarity violation at high-energy scales. They include maintaining flavor universality and absence of zero-distance flavor transition. We present a framework for...

Simple and compact expressions for neutrino oscillation probabilities in matter

We reformulate perturbation theory for neutrino oscillations in matter with an expansion parameter related to the ratio of the solar to the atmospheric Δm 2 scales. Unlike previous works, we use a renormalized basis in which certain first-order effects are taken into account in the zeroth-order Hamiltonian. We show that the new framework has an exceptional feature that leads to...

Compact perturbative expressions for neutrino oscillations in matter

We further develop and extend a recent perturbative framework for neutrino oscillations in uniform matter density so that the resulting oscillation probabilities are accurate for the complete matter potential versus baseline divided by neutrino energy plane. This extension also gives the exact oscillation probabilities in vacuum for all values of baseline divided by neutrino...

Constraining Majorana CP phase in the precision era of cosmology and the double beta decay experiment

We show that precision measurement of (1) the sum of neutrino masses by cosmological observation and (2) the lifetime of neutrinoless double beta decay in ton-scale experiments, with supplementary use of (3) effective mass measured in a single beta decay experiment, would allow us to obtain information on the Majorana phase of neutrinos. To quantify the sensitivity to the phase...

Constraint on neutrino decay with medium-baseline reactor neutrino oscillation experiments

The experimental bound on lifetime of ν 3, the neutrino mass eigenstate with the smallest ν e component, is much weaker than those of ν 1 and ν 2 by many orders of magnitude to which the astrophysical constraints apply. We argue that the future reactor neutrino oscillation experiments with medium-baseline (∼50 km), such as JUNO or RENO-50, has the best chance of placing the most...

Possible interpretations of IceCube high-energy neutrino events

We discuss possible interpretations of the 37 high energy neutrino events observed by the IceCube experiment in the South Pole. We examine the possibility to explain the observed neutrino spectrum exclusively by the decays of a heavy long-lived particle of mass in the PeV range. We compare this with the standard scenario, namely, a single power-law spectrum related to neutrinos...

Trajectory Slopes in a Gauge-Dual-Topological Approach to Soft Hadronic Reactions*)

Hisakazu MINAKATA 0 0 Department of Physics, Tokyo ]Jfetropolitan University , Tokyo 158 Trajectory slopes of hadrons with different topological structure are investigated in detail from the QCD

Multi-Jet Structure of Hadronic Final States and Trajectory Slope

On the basis of Veneziano's multi-jet view of hadronic final states, trajectory slopes of the pomeron and the baryonium family are calculated in the unit of the ρ-trajectory slope. It is shown that an improved treatment of the multi-chain random walk problem in the impact parameter space leads to the result where M2NJ stands for N quark-N antiquark baryonium state.

Pomeron Slope vs. Reggeon Slope in Dual Multiperipheral Model

Hisakazu MINAKATA 0 0 Department of Physics, Tokyo Metropolitan University Tokyo 158 Estimated is the ratio a'pfa'B, of the output Pomeron slope to the Reggeon slope within the framework of dual

Coherent State Representation of Multiparticle Final States and Shadow Scattering at Very High Energies

We discuss elastic diffraction scattering from the viewpoint of the coherent state representation of multiple production. The inelastic final states of hadron collisions are assumed to be the statistical mixture of the coherent states whose structure is controlled by the Ginzburg-Landau-type free energy functional. Under the saddle-point approximation in the functional...

Self-Consistent Scaling Model for Multiplicity Distribution and Semi-Inclusive Missing Mass Spectra. II

On page 1547, fourth line from Eq. (9), the equation ⋯〈n - 〈n〉>2≫0. ⋯ should be corrected to read 〈(n - 〈n〉)2〉>0. Publication Office

Self-Consistent Scaling Model for Multiplicity Distribution and Semi-Inclusive Missing Mass Spectra. II*)

The self-consistency condition for a scaling model proposed in a previous paper is examined in detail. With a simple and natural choice of an unknown function g(α), the normalized moments turn out to be of the Pólya-type. The phenomenological success of the Pólya-type correlation is supported by the theoretical foundation in this paper.

Self-Consistent Scaling Model for Multiplicity Distribution and Semi-Inclusive Missing Mass Spectra

Incorporating the observed similarity between the system XM of mass M in the reaction p+p →p+XM and the system Xs of mass √s in the reaction p+p →Xs, we construct a phenomenological scaling model which can describe the multiplicity distribution and the semi-inclusive missing mass spectra in a self-consistent way.

A Geometrical Aspect of Multiplicity Distribution and Elastic Diffraction Scattering

Hisakazu MINAKATA 0 0 Research Institute for Theoretical Physics Hiroshima University , Takehara, Hiroshima 725 A simple geometrical picture is presented which leads to the compound Poisson-type

Coherent State Representation of Multiparticle Final States and Power Behaviour in Deep Scattering

We discuss the power behaviour observed in particle production at large transverse momentum (p⊥) and in wide-angle elastic scattering from the viewpoint of the coherent state representation of multiple production. We show that the power-like fall-off of the inclusive p⊥-distribution is a natural consequence of our representation with the Ginzburg-Landau-type free energy...

Shadow Approach to Elastic Scattering of Diffractive States

We discuss elastic scattering of average inelastic diffractive state→average inelastic diffractive state (AIDS→AIDS) type in the shadow approach to diffraction. It is pointed out that an AIDS→AIDS scattering amplitude is related to the third moment of the diffractive eigenamplitude spectrum. Calculations are performed using Squires' model with s-channel factorization and the...

Multiplicity Distribution Model Based on Cluster Assumption in High-Energy Hadronic Collisions

In order to describe the feature of correlations among produced particles in high-energy hadronic collisions, a new type of multiplicity distribution is introduced. The distribution can be derived from some simple assumptions of clustering for produced particles, and it corresponds to a modified Pólya distribution in which two parameters are included besides the averaged...