Conveners
WG5: Beyond PMNS: Hybrid Parallel 1
- Doojin Kim (Texas A&M University)
- Joshua Berger (Colorado State University)
WG5: Beyond PMNS: Hybrid Parallel 2
- Zahra Tabrizi (Northwestern University)
WG5: Beyond PMNS: Hybrid Parallel 3
- Yue Zhao (University of Utah)
WG5: Beyond PMNS: Virtual Parallel 1
- Koun Choi (IBS)
WG5: Beyond PMNS: Virtual Parallel 2
- Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)
WG5: Beyond PMNS: Hybrid Parallel 4
- Karol Adamczyk ()
WG5: Beyond PMNS: Hybrid Parallel 5
- Doojin Kim (Texas A&M University)
Three mysteries stand after the discovery of the Higgs boson: (i) the origin of the masses of the neutrinos; (ii) the origin of the baryon asymmetry in the universe; and (iii) the nature of dark matter. The FCC-ee provides an exciting opportunity to resolve these mysteries with the discovery of heavy neutral leptons (HNLs), in particular using the large sample (5.10^12) Z bosons produced in...
In accordance with the WG subject, we are concerned with the fundamental question of the number of neutrino species existing in nature. We report on a theoretical description of the mixing space based on singular values, contractions, and dilation procedures. With a bird’s eye perspective, it provides an independent way of doing neutrino mixing analysis allowing for quantitative searches of...
The MicroBooNE collaboration recently released a series of measurements aimed at investigating the nature of the excess of low energy electromagnetic interactions observed by the MiniBooNE collaboration. In the talk, we will present the results on the search for an anomalous excess of electron neutrino events. This search was performed leveraging three independent analyses which target...
We point out that the production of new bosons by charged meson decays can greatly enhance the sensitivity of beam-focused accelerator-based experiments to new physics signals. This enhancement arises since the charged mesons are focused and their three-body decays do not suffer from helicity suppression in the same way as their usual two-body decays. As a realistic application, we attempt to...
The “flavor problem” represents one of the greatest challenges of particle model building since SM does not provide neither “a priori” explanation of the number of fermion generations nor on their mass and mixing patters, which appear to be very different in the lepton and quark sector. Discrete non-abelian symmetries have gathered a lot of attention as candidates for the solutions of the...
We propose a new possibility of using the coherently enhanced neutrino pair emission to probe light-mediator interactions between electron and neutrinos. With typical momentum transfer at the atomic $\mathcal O(1$\,eV) scale, this process is extremely sensitive for the mediator mass range $\mathcal O(10^{-3} \sim 10^4$)\,eV. The sensitivity on the product of couplings with electron ($g^e$ or...
I discuss predictions for signals of some dark sector models at the Fermilab Short Baseline Neutrino (SBN) experiments. I consider prospects for both inelastic dark matter models and Higgs portal mediator models. I demonstrate that new parameter space for both models can be probed in the near future. I discuss new simulation and analysis strategies, the latter including machine learning...
Lorentz violation and non-standard interactions are two of the most popular scenarios beyond the Standard Model of particle physics, both of which can affect neutrino oscillations significantly. However, these effects can mimic each other, and it would be difficult to distinguish between them in any fixed-baseline neutrino experiment. We show that atmospheric neutrinos, having access to a wide...
ArgoNeuT was a 0.24 ton Liquid Argon Time Projection Chamber detector at Fermilab running from 2009 to 2010. It was located along the NuMI neutrino beam and collected six months of data in anti-neutrino beam mode. ArgoNeuT’s data-set has been used to perform numerous first neutrino cross-section measurements on argon. It can also be used to probe physics beyond the standard model resulting...
The recent evidence for coherent elastic neutrino-nucleus scattering (CE\nuνNS) in the NCC-1701 germanium detector using antineutrinos from the Dresden-II nuclear reactor is in good agreement with standard model expectations. However, we show that a 2σ improvement in the fit to the data can be achieved if the quenching factor is described by a modified Lindhard model with a negative value of...
The information about the Earth's interior structure comes from seismic studies and gravitational measurements. The Preliminary Reference Earth Model (PREM) of the density of the Earth is obtained by measuring the travel time of seismic waves. Here, the density distribution inside the Earth is estimated from the model-dependent empirical relations having assumptions based on temperature,...
The nature of neutrinos, whether they are Dirac or Majorana particles, has been an open question for long time. In the case of two flavour mixing, the transition matrix is real in the case of Dirac neutrinos but it contains a phase $\phi$ in the case of Majorana neutrinos. This phase does not appear in neutrino oscillation probabilities for vacuum oscillations as well as for matter modified...
We propose a new approach to explore the neutral-current non-standard neutrino interactions (NSI) in atmospheric neutrino experiments using oscillation dips and valleys in reconstructed muon observables, at a detector like ICAL that can identify the muon charge. We focus on the flavor-changing NSI parameter $\varepsilon_{\mu\tau}$, which has the maximum impact on the muon survival probability...
The clockwork mechanism generates small neutrino masses which includes Dirac mass terms as well as Majorana mass terms for the new fermions with exponentially
suppressed interactions in theories which contain no small parameters at the fundamental
level. We work on a general description of the clockwork mechanism valid for
fermions. This mechanism can be implemented with a discrete
set of...
We explore the connection between neutrino mass models and muon experiments, esp. those looking for charged lepton flavor violation.
Neutrino oscillations are a very well established phenomenon and in the last two decades we have been able to determine almost all the oscillation parameters with few percents precision.
However, there is still room for the possibility of the presence of new physics effects. In this context, long-baseline (LBL) accelerator experiments provide a great environment to probe BSM (Beyond Standard...
We study the evolution of the lepton number for a $SU(2)$ doublet consisting of a massive neutrino and a charged lepton. By choosing a specific initial lepton family for a neutrino we can compute the evolution of all lepton family numbers. Our framework results in additional oscillation phases that are important for nonrelativisitc neutrinos. We study the phenomenology of relativistic and...
NEXT (Neutrino Experiment with a Xenon TPC) is an international collaboration with the objective of searching for neutrinoless double beta decay in xenon. After an initial R&D phase in which the TPC technology was developed, it was able to successfully run a small (5 kg of xenon) detector, NEXT-White (2016-2021). The detector was hosted at Laboratorio Subterráneo de Canfranc, an underground...
Multiple theories beyond the Standard Model predict the existence of heavy neutrinos, such as the Type I or Type III seesaw mechanisms which can explain the light neutrino masses, or left-right symmetric models which restore parity symmetry in weak interactions at higher energy scale and predict right-handed counterparts to the weak gauge bosons. Searches for such heavy Majorana or Dirac...
The latest results and prospects of searches for heavy neutrinos at the CMS experiment will be presented.
We report the results from MicroBooNE's search for a single-photon excess in the Booster Neutrino Beam at Fermilab, a potential interpretation to the long-standing MiniBooNE low-energy excess anomaly. We highlight recent results targeting neutrino-induced neutral current resonant ∆(1232) baryon production followed by ∆ radiative decay. Data corresponding to MicroBooNE’s first three years of...
The ICARUS detector will search for LSND-like neutrino oscillations exposed at shallow depth to the FNAL BNB beam as the far detector in the Short-Baseline Neutrino (SBN) program. Cosmic backgrounds rejection is particularly important for the ICARUS detector due to its larger size and distance from neutrino production compared to the near detector SBND. In ICARUS the neutrino signal over...
The abundance of dark matter in the Universe could be explained by heavy dark matter. Dark matter is expected to be accumulated near the center of massive astrophysical objects, and the decay of it could produce highly energetic neutrinos detectable at Earth with large neutrino telescopes. The IceCube Neutrino Observatory is a cubic kilometer-scale neutrino telescope located under 1.5 km of...
The IceCube neutrino observatory--installed in the Antarctic ice--is the largest neutrino telescope to date. It consists of 5,160 photomultiplier-tubes spread among 86 vertical strings making a total detector volume of more than a cubic kilometer. IceCube detects neutrinos via Cherenkov light emitted by charged relativistic particles produced when a neutrino interacts in or near the detector....
TBD