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Neutrino Mass Ordering - Analyzing Current Status And Future Opportunities

One of the most significant outstanding difficulties in completing our understanding of masses and mixings in the lepton sector is identifying the neutrino mass ordering.

The two alternatives, normal vs. inverted, may come from entirely different underlying symmetries, so determining which one is realized in nature is a necessary step towards solving the flavor problem, i.e., ensuring complete theoretical knowledge of the origin of particle masses and mixings.

Currently, oscillations in matter, measured at a long-baseline accelerator or atmospheric neutrino beams in combination with reactor experiments, are the leading probe among the three available methods to extract the neutrino mass ordering.

Cosmological observations may provide indirect but independent limitations on neutrino mass ordering.

What Is Neutrino?

A neutrino is a subatomic particle that resembles an electron but lacks an electrical charge and has a very tiny mass.

Nuclear forces regard electrons and neutrinos the same way; neither participate in the solid nuclear energy, but both do in the weak atomic force equally.

Neutrinos are one of the universe's most numerous particles, although they are very difficult to detect.

Neutrinos are particles that can pass through the thick material created by a falling star; however, only a tiny proportion of the available energy is converted to light.

Neutrinos produced in fusion processes in the sun carry away around 2% of the sun's energy.

Supernovae are primarily neutrino phenomena, and most of the universe's dark matter is probably made up of primordial Big Bang neutrids.

The so-called solar neutrino problem is a long-standing topic of study.

Oscillations Of Neutrino

The effective matter potential owing to electron (anti) neutrino charged-current elastic scatterings with electrons in the medium will affect the three-flavor mixing processes as neutrinos pass through the Earth.

The neutrino mass ordering will heavily influence the impact. The resonance effect is projected for neutrino energy ranging from 2.5 to 3.8 GeV.

Long-baseline tests with T2K and NOvA alone show a slight preference for regular mass ordering. The global analysis uses the complementarity between the various outcomes to gain superior sensitivities to them.

Long-baseline accelerator experiments are similarly susceptible to neutrino channel appearance and disappearance.

Although values in the first octant are permitted, the best-fit value for the atmospheric mixing angle is in the second octant.

Only around half of the parameter space is available at the 3σ level for normal and inverted ordering.

Neutrino oscillations are approaching accuracy, with 5% or less relative uncertainties. T2K and reactor data analysis yield extra stress concerning the desired value of atmospheric mass splitting.

Glitter small gold flakes and transparent colorful balls are falling
Glitter small gold flakes and transparent colorful balls are falling

Neutrino Mass Ordering In Decay Experiments

The most accurate way to determine absolute neutrino masses is to examine the spectrum of β-decay near the electron spectrum's terminus.

Each of the individual mass eigenstates helps to suppress the energy spectrum. In theory, future tests may strive for such an energy resolution.

In the inverted ordering situation, the mass difference between the two lightest mass eigenstates is the greatest conceivable.

The fact that the predicted number of events is fewer in the inverted ordering situation than in the regular ordering case might be used to investigate the neutrino mass ordering.

Neutrinoless double beta decay investigations attempt to measure the decay's life period T0v1/2. M0vN is the neutrinoless double beta decay process's nuclear matrix element.

Neutrinoless double beta experiments may be used to differentiate between the two mass orderings. This implies that experiments capable of testing the m 10 meV area can rule out the inverted scenario.

Neutrinoless double beta decay can't yet restrict neutrino mass ordering. If the order of the three active neutrinos is flipped, some possibility remains.

Cosmological Findings

Massive neutrinos have many effects on cosmic observables. Current neutrino mass constraints suggest that during the matter-dominated epoch of the universe, at least two of the three massive eigenstates became non-relativistic.

The redshift at which neutrinos become non-relativistic is a critical epoch addressing the influence of large neutrinos on the history of cosmic expansion and perturbation development.

Cosmic Microwave Background

Once neutrinos become non-relativistic, there are many fingerprints of neutrino masses on the cosmic microwave background temperature variations pattern.

These imprints include a change in the quantity of non-nuclear energy density at late periods or a shift in the matter-radiation equality redshift.

The Late Integrated Sachs Wolfe impact influences the cosmic microwave background spectrum at a region where cosmic variance makes precise measurements impossible.

The change in the position of the acoustic peaks and the Early Integrated Sachs Wolfe effects may both be readily adjusted for by other factors such as the Hubble constant H0.

Two factors may significantly increase the sensitivity of cosmic microwave background measurements to total neutrino mass.

One is a distortion of photon pathways caused by matter inhomogeneities along the line of sight.

The other is the suppression of clumping at scales smaller than the horizon's size.

On the other hand, the reionization process occurred in the late universe, when the first generation of galaxies released ultraviolet photons that ionized the neutral hydrogen.

Reionization increases the number of free electrons in the atmosphere, which may scatter the cosmic microwave background.

Universe Large Structure

The matter power spectrum bears the brunt of the influence of neutrino masses on cosmic observables. One may argue that determining the neutrinos' relic masses and ordering is simple.

However, nuances must be considered, as we will explain. Various issues may obstruct a good understanding of the scale-dependent neutrino mass suppression of clustering.

A basic model of structure development predicts that the galaxy power spectrum is connected to the matter at large scales by a constant known as b, the light-to-mass bias.

Neutrino masses are most sensitive at scales k=0.1 h Mpc1, where k is the subatomic particle's mass. Massive neutrinos restrict the power spectrum of linear matter below their streaming size.

Instead of the broad-band form of the galactic power spectrum, the geometrical method uses Baryon Acoustic Oscillations.

The Baryon Acoustic Oscillations signal is represented as a peak in the two-point mass correlation function, corresponding to the distance a sound wave may travel in the photon-baryon fluid.

Cosmological Constraints On Neutrino Masses Ordering

The Planck cosmic microwave background power spectra prefer a greater lensing amplitude, while lensing potential reconstructions favor a smaller one.

Using Baryon Acoustic Oscillations is a more robust technique since the effects of galactic bias and non-linearities are not as severe as in the shape approach.

A different tracer for mapping the big-scale structure of our universe may increase the cosmic microwave background-only limitations on the total of the three active neutrinos.

When paired with Planck TT + lowP + lensing + Baryon Acoustic Oscillations + SNIa data, the limit on the sum of the three active neutrino masses provided by the Planck team using this value of H0 is 0.23 eV.

There are, however, several estimations of the Hubble constant.

A potentially harmful mix of contradictory data sets. These additional sterile species will add to the adequate number of relativistic degrees of freedom.

Because of the significant degeneracy between Neff and âmv, the limits on the total neutrino mass are less rigorous than in the conventional three-neutrino situation.

Planck's cosmic microwave background observations greatly aid in sharpening Neff measurements, particularly when considering polarization data at tiny scales.

Future Prospects Of Neutrino Masses Ordering

Oscillations Prospects

The neutrino mass ordering will be measured with astounding accuracy by next-generation equipment.

The NOvA experiment alone anticipates a 3.2 sensitivity for 30-50 percent of the CP values calculated by 2,024 Himmel. Deep Underground Neutrino Experiment (DUNE), or Deep Underground Neutrino Experiment, is a new long-baseline accelerator experiment.

DUNE is equipped with a modest near detector and a massive distant detector with a fiducial mass of 40 kton. It will be 1,300 kilometers distant from Fermilab's neutrino source.

A bigger version of the Super-Kamiokande detector is also in the works. As an expansion of T2HK to Korea, a third project has been suggested.

The longer trip taken by the neutrinos observed in T2HKK inside the Earth will result in increased sensitivity.

A perfect experiment would count the number of incidents in each energy and zenith angle category. This enables us to establish the genuine mass ordering that exists in nature.

Jiangmen Underground Neutrino Observatory (JUNO) will be positioned 53 kilometers from China's Yangjiang and Taishan nuclear power reactors. JUNO will give accurate measurements of solar oscillation characteristics with a 1 percent accuracy.

In this regard, JUNO might aid in resolving the apparent discrepancy between the mass splitting recorded in solar tests and the reactor experiment KamLAND. Beyond the SM, the detector will be sensitive to various novel physics situations.

Beta-Decay Experiments Prospects

It will be exceedingly difficult to determine the mass ordering by observing the energy spectrum towards the conclusion of β-decay or anything similar.

An outstanding energy resolution is necessary to differentiate the kink in the spectrum caused by the second and third mass eigenstates.

The initial KATRIN findings are anticipated in early 2019. However, the ultimate goal of statistics will be attained after three years of data collection.

The final mass determination may have a higher sensitivity than the nominal one of 0.2 eV.

Project-8, which will employ Cyclotron Radiation Emission Spectroscopy (CRES) to measure the mass of the electron antineutrino, is another tritium experiment that will use different technology.

The method detects the frequency of cyclotron radiation generated by electrons liberated during decay and spiraled into a magnetic field.

CRES is now in the calibration process (phase II) for a modest prototype that will not be sensitive enough to compete in neutrino mass measurement.

Starting in 2020, a large volume system employing molecular tritiuman extensive will be used as an intermediary step before transitioning to phase IV, which is essential to eliminate uncertainty linked to excited molecular triteium states.

The PTOLEMY project, which just received approval from the Scientific Committee of the Laboratori Nazionali del Gran Sasso, aims to detect the relic neutrino background.

It will be possible to examine and discover the mass ordering by observing the tritium decay β-spectrum. The HOLMES and ECHo experiments, which try to determine the mass of electron neutrinos, are another kind of experiment.

People Also Ask

Do All Neutrinos Have The Same Mass?

Although neutrinos were thought to be massless for a long time, it is now known that there are three distinct neutrino masses with different small values, although the three masses do not uniquely correlate to the three flavors.

What Is The Mass Of A Neutrino?

Cosmological data show that neutrinos have masses of 0.1 eV or less.

How Do Neutrinos Change Mass?

The various mass levels go out of step as the electron neutrino moves; the lightest state has a little higher velocity than the heavier ones.

The initial composition of mass 1, mass 2, and mass 3 that made up the electron neutrino changes throughout the neutrino's course as a result.

How Does Neutrino Get Mass?

Neutrinos are a sort of fermion, which is a primary particle. All other fermions, including leptons and quarks, receive mass via interactions with the Higgs boson.

Final Words

The neutrino mass ordering is critical for a thorough knowledge of flavor physics.

Its determination may be vital in establishing the link between lepton masses and mixings and their corresponding qualities in the quark sector.

The extraction of neutrino mass ordering is a data-driven are predicted to increase during the next decade.

About The Authors

Suleman Shah

Suleman Shah - Suleman Shah is a researcher and freelance writer. As a researcher, he has worked with MNS University of Agriculture, Multan (Pakistan) and Texas A & M University (USA). He regularly writes science articles and blogs for science news website immersse.com and open access publishers OA Publishing London and Scientific Times. He loves to keep himself updated on scientific developments and convert these developments into everyday language to update the readers about the developments in the scientific era. His primary research focus is Plant sciences, and he contributed to this field by publishing his research in scientific journals and presenting his work at many Conferences. Shah graduated from the University of Agriculture Faisalabad (Pakistan) and started his professional carrier with Jaffer Agro Services and later with the Agriculture Department of the Government of Pakistan. His research interest compelled and attracted him to proceed with his carrier in Plant sciences research. So, he started his Ph.D. in Soil Science at MNS University of Agriculture Multan (Pakistan). Later, he started working as a visiting scholar with Texas A&M University (USA). Shah’s experience with big Open Excess publishers like Springers, Frontiers, MDPI, etc., testified to his belief in Open Access as a barrier-removing mechanism between researchers and the readers of their research. Shah believes that Open Access is revolutionizing the publication process and benefitting research in all fields.

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