arXiv subjects

Pedro Pasquini

Publications and source records attributed to Pedro Pasquini.

30 records · Page 2Linked to original sources

arXiv2019

Physics with Beam Tau-Neutrino Appearance at DUNE

We explore the capabilities of the upcoming Deep Underground Neutrino Experiment (DUNE) to measure $ν_τ$ charged-current interactions and the associated oscillation probability $P(ν_μ\to ν_τ)$ at its far detector, concentrating on how such results can be used to probe neutrino properties and interactions. DUNE has the potential to identify significantly more $ν_τ$ events than all existing experiments and can use this data sample to nontrivially test the three-massive-neutrinos paradigm by providing complementary measurements to those from the $ν_e$ appearance and $ν_μ$ disappearance channels. We further discuss the sensitivity of the $ν_τ$ appearance channel to several hypotheses for the physics that may lurk beyond the three-massive-neutrinos paradigm: a non-unitary lepton mixing matrix, the $3+1$ light neutrinos hypothesis, and the existence of non-standard neutral-current neutrino interactions. Throughout, we also consider the relative benefits of the proposed high-energy tune of the Long-Baseline Neutrino Facility (LBNF) beam-line.

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arXiv2018

Zee and Zee-Babu mechanisms in the minimal 331 model

We show that the minimal 3-3-1 model cannot accommodate the neutrino masses at tree level using present experimental data. Nevertheless, a modified Zee and the Zee-Babu mechanisms for generating neutrino masses at 1-loop and 2-loop, respectively, are automatically implemented in the minimal 3-3-1 model, without introducing new degrees of freedom to the model. We also present a systematic method for finding solutions to the leptonic sector masses and mixing. As a case study, we accommodate the charged and neutral leptons masses and the PMNS matrix in the 1-loop modified Zee mechanism contained in the minimal 3-3-1 model.

hep-ph↗

arXiv2018

Shadowing Neutrino Mass Hierarchy with Lorentz Invariance Violation

The effects of Lorentz Invariance Violation(LIV) operators up to dimension 6 in long baseline neutrino experiments are discussed, in specific for DUNE and T2K. A phenomenological Lagrangian is proposed followed by a computation of the effective Hamiltonian of neutrino propagation in matter for mass eigenstates. It is shown that the simplest dimension 4 Lorentz violation parameter can decrease DUNE sensitivity to neutrino mass hierarchy. Also, a $χ^2$ analysis is performed to obtain the expected long-baseline constraints to the LIV operators up to dimension 6.

hep-ph↗

arXiv2018

Exploring the Potential of Short-Baseline Physics at Fermilab

We study the capabilities of the short baseline neutrino program at Fermilab to probe the unitarity of the lepton mixing matrix. We find the sensitivity to be slightly better than the current one. Motivated by the future DUNE experiment, we have also analyzed the potential of an extra liquid Argon near detector in the LBNF beamline. Adding such a near detector to the DUNE setup will substantially improve the current sensitivity on non-unitarity. This would help to remove CP degeneracies due to the new complex phase present in the neutrino mixing matrix. We also study the sensitivity of our proposed setup to light sterile neutrinos for various configurations.

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arXiv2018

Review: Long-baseline oscillation experiments as a tool to probe High Energy Models

We review the current status of neutrino oscillation experiments, mainly focussed on T2(H)K, NO$ν$A and DUNE. Their capability to probe high energy physics is found in the precision measurement of the CP phase and $θ_{23}$. In general, neutrino mass models predicts correlations among the mixing angles that can be used to scan and shrink down its parameter space. We updated previous analysis and presents a list of models that contain such structure.

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arXiv2017

Probing atmospheric mixing and leptonic CP violation in current and future long baseline oscillation experiments

We perform realistic simulations of the current and future long baseline experiments such as T2K, NO$ν$A, DUNE and T2HK in order to determine their ultimate potential in probing neutrino oscillation parameters. We quantify the potential of these experiments to underpin the octant of the atmospheric angle $θ_{23}$ as well as the value and sign of the CP phase $δ_{CP}$.

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arXiv2017

Reactor and Atmospheric Neutrino Mixing Angles' Correlation as a Probe for New Physics

We performed a simulation on the DUNE experiment to probe the capability of future neutrino long-baseline experiments' ability to constrain the parameter space of high-energy models by using the correlation between the atmospheric and reactor mixing angles. As an example, we took the Tetrahedral Flavour Symmetry model, which predicts a strong relation between the non-zero value of $θ_{13}$ and deviation of $θ_{23}$ from the maximality. We show that in this case, the model can realistically be excluded in more than $3σ$ for most of the parameter space. We also study the octant degeneracy at DUNE and its impact on the sensitivity of such models.

hep-ph↗

arXiv2017

Cornering the revamped BMV model with neutrino oscillation data

Using the latest global determination of neutrino oscillation parameters from~\cite{deSalas:2017kay} we examine the status of the simplest revamped version of the BMV (Babu-Ma-Valle) model, proposed in~\cite{Morisi:2013qna}. The model predicts a striking correlation between the "poorly determined" atmospheric angle $θ_{23}$ and CP phase $δ_{CP}$, leading to either maximal CP violation or none, depending on the preferred $θ_{23}$ octants. We determine the allowed BMV parameter regions and compare with the general three-neutrino oscillation scenario. We show that in the BMV model the higher octant is possible only at $99\%$ C.L., a stronger rejection than found in the general case. By performing quantitative simulations of forthcoming DUNE and T2HK experiments, using only the four "well-measured" oscillation parameters and the indication for normal mass ordering, we also map out the potential of these experiments to corner the model. The resulting global sensitivities are given in a robust form, that holds irrespective of the true values of the oscillation parameters.

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arXiv2017

Analytical solution for the Zee mechanism

We found an analytical solution for the neutrino mass matrix in the most general case of the Zee model. Using the recent data on the neutrino parameters besides generating neutrino masses at 1-loop level we fit also the masses of the charged leptons and the leptonic mixing matrix. We also show in what conditions the model is not compatible with neutrino data.

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arXiv2017

Resolving the atmospheric octant by an improved measurement of the reactor angle

Taking into account the current global information on neutrino oscillation parameters we forecast the capabilities of future long baseline experiments such as DUNE and T2HK in settling the atmospheric octant puzzle. We find that a good measurement of the reactor angle $θ_{13}$ plays a key role in fixing the octant of the atmospheric angle $θ_{23}$ with such future accelerator neutrino studies.

hep-ph↗

arXiv2017

Measuring the Leptonic CP Phase in Neutrino Oscillations with Non-Unitary Mixing

Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase $δ_{CP}$ of the simplest three-neutrino mixing benchmark scheme. This would hinder the possibility of probing for CP violation in accelerator-type experiments. We take T2K and T2HK as examples to demonstrate the degeneracy between the "standard" (or "unitary") and "non-unitary" CP phases. We find, under the assumption of non-unitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a $μ$DAR source for better measurement of $δ_{CP}$ can partially break the CP degeneracy by probing both $\cos δ_{CP}$ and $\sin δ_{CP}$ dependences in the wide spectrum of the $μ$DAR flux. We also show that the further addition of a near detector to the $μ$DAR setup can eliminate the degeneracy completely.

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arXiv2016

Neutrino oscillations from warped flavor symmetry: predictions for long baseline experiments T2K, NOvA and DUNE

Here we study the pattern of neutrino oscillations emerging from a previously proposed warped model construction incorporating $Δ(27)$ flavor symmetry. In addition to a complete description of fermion masses, the model predicts the lepton mixing matrix in terms of two parameters. The good measurement of $θ_{13}$ makes these two parameters nearly proportional, leading to an approximate one-parameter description of neutrino oscillations. There is a sharp fourfold degenerate correlation between $δ_{CP}$ and the atmospheric mixing angle $θ_{23}$, so that maximal $θ_{23}$ also implies maximal leptonic CP violation. The predicted electron neutrino and anti-neutrino appearance probabilities indicate that the model should be tested at the T2K, NO$ν$A and DUNE long baseline oscillation experiments.

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