12,207 research outputs found
Phenomenology of Neutrino Oscillations at the Neutrino Factory
We consider the prospects for a neutrino factory to measure mixing angles,
the CP violating phase and mass-squared differences by detecting wrong-charged
muons arising from the chain \mu^+ to \nu_e to \nu_\mu\ to \mu^- and the
right-charged muons coming from the chain \mu^+ to \bar{\nu}_\mu\ to
\bar{\nu}_\mu\ to \mu^+ (similar to \mu^- chains), where \nu_e to \nu_\mu\ and
\bar{\nu}_\mu\ to \bar{\nu}_\mu\ are neutrino oscillation channels through a
long baseline. First, we perform the baseline and energy optimization of the
neutrino factory including the latest simulation results from the magnetized
iron neutrino detector (MIND). Second, we study physics with near detectors and
consider the treatment of systematic errors including cross section errors,
flux errors, and background uncertainties. Third, the effects of one additional
massive sterile neutrino are investigated in the context of near and far
detector combinations.Comment: 4 pages, 3 figures, proceedings for TAUP201
Study of Non-Standard Charged-Current Interactions at the MOMENT experiment
MuOn-decay MEdium baseline NeuTrino beam experiment (MOMENT) is a
next-generation accelerator neutrino experiment looking for more physics study.
We try to simulate neutrino oscillations confronting with
Charged-Current\&Non-Standard neutrino Interactions(CC-NSIs) at MOMENT. These
NSIs could alter neutrino production and detection processes and get involved
in neutrino oscillation channels. We separate a perturbative discussion of
oscillation channels at near and far detectors, and analyze parameter
correlations with the impact of CC-NSIs. Taking and
as an example, we find that CC-NSIs can induce bias in precision measurements
of standard oscillation parameters. In addition, a combination of near and far
detectors using Gd-doped water cherenkov technology at MOMENT is able to
provide good constraints of CC-NSIs happening at the neutrino production and
detection processes.Comment: 14 pages, 5 figures. Matches the published versio
Full-counting statistics of charge and spin transport in the transient regime: A nonequilibrium Green's function approach
We report the investigation of full-counting statistics (FCS) of transferred
charge and spin in the transient regime where the connection between central
scattering region (quantum dot) and leads are turned on at . A general
theoretical formulation for the generating function (GF) is presented using a
nonequilibrium Green's function approach for the quantum dot system. In
particular, we give a detailed derivation on how to use the method of path
integral together with nonequilibrium Green's function technique to obtain the
GF of FCS in electron transport systems based on the two-time quantum
measurement scheme. The correct long-time limit of the formalism, the
Levitov-Lesovik's formula, is obtained. This formalism can be generalized to
account for spin transport for the system with noncollinear spin as well as
spin-orbit interaction. As an example, we have calculated the GF of
spin-polarized transferred charge, transferred spin, as well as the spin
transferred torque for a magnetic tunneling junction in the transient regime.
The GF is compactly expressed by a functional determinant represented by
Green's function and self-energy in the time domain. With this formalism, FCS
in spintronics in the transient regime can be studied. We also extend this
formalism to the quantum point contact system. For numerical results, we
calculate the GF and various cumulants of a double quantum dot system connected
by two leads in transient regime. The signature of universal oscillation of FCS
is identified. On top of the global oscillation, local oscillations are found
in various cumulants as a result of the Rabi oscillation. Finally, the
influence of the temperature is also examined
Full-counting statistics of energy transport of molecular junctions in the polaronic regime
We investigate the full-counting statistics (FCS) of energy transport carried
by electrons in molecular junctions for the Anderson-Holstein model in the
polaronic regime. Using two-time quantum measurement scheme, generating
function (GF) for the energy transport is derived and expressed as a Fredholm
determinant in terms of Keldysh nonequilibrium Green's function in the time
domain. Dressed tunneling approximation is used in decoupling the phonon cloud
operator in the polaronic regime. This formalism enables us to analyze the time
evolution of energy transport dynamics after a sudden switch-on of the coupling
between the dot and the leads towards the stationary state. The steady state
energy current cumulant GF in the long time limit is obtained in the energy
domain as well. Universal relations for steady state energy current FCS are
derived under finite temperature gradient with zero bias and this enables us to
express the equilibrium energy current cumulant by a linear combination of
lower order cumulants. Behaviors of energy current cumulants in steady state
under temperature gradient and external bias are numerically studied and
explained. Transient dynamics of energy current cumulants is numerically
calculated and analyzed. The universal scaling of normalized transient energy
cumulants is found under both temperature gradient and external bias
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