Conveners
Neutrino Physics and Leptons
- Michael Schmidt (UNSW Sydney)
Neutrino Physics and Leptons
- Toshihiko Ota (Universidad Autonoma de Madrid)
Neutrino Physics and Leptons
- Claudia Hagedorn (Instituto de Fisica Corpuscular (IFIC))
Neutrino Physics and Leptons
- Shun Zhou (IHEP, CAS)
Neutrino Physics and Leptons
- Claudia Hagedorn (Instituto de Fisica Corpuscular (IFIC))
Reactor experiments provide an excellent platform to investigate the atomic ionization effects induced by the unexplored neutrino interaction channels. Including the atomic effects in our calculations, we study the neutrino-electron scattering by reactor anti-neutrinos in low-energy electron recoil detectors such as Si/Ge in light of neutrino non-standard interactions with leptons. We find...
Recent measurements of the germanium quenching factor deviate significantly from the predictions of the standard Lindhard model for nuclear recoil energies below a keV. This departure may be explained by the Migdal effect in neutron scattering on germanium. In this talk, we will discuss the Migdal effect on the quenching factor, We show it can mimic the signal of a light Z′ or light scalar...
The Forward Physics Facility (FPF) at LHC has the potential to explore the far-forward region at LHC. FASER$\nu$ is the dedicated program at FPF to study collider neutrinos. Charged current neutrino interactions have been extensively studied in the context of various experiments, including FASER$\nu$. The presence of a charged lepton in the final state allows for easy identification of...
We propose a model-independent framework to classify and study neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number together with an operator which violates lepton number by two units and contains this particle. This allows to study processes which do not violate lepton number, while...
We propose a leptoquark model with two scalar leptoquarks $S^{}_1 \left( \bar{3},1,\frac{1}{3} \right)$ and $\widetilde{R}^{}_2 \left(3,2,\frac{1}{6} \right)$ to give a combined explanation of neutrino masses, lepton flavor mixing and the anomaly of muon $g-2$, satisfying the constraints from the radiative decays of charged leptons. The neutrino masses are generated via one-loop corrections...
In this seminar, we consider a set of new symmetries in the SM: {\it diagonal reflection} symmetries $R \, m_{u,\nu}^{*} \, R = m_{u,\nu}, ~ m_{d,e}^{*} = m_{d,e}$ with $R =$ diag $(-1,1,1)$. These generalized $CP$ symmetries predict the Majorana phases to be $\alpha_{2,3} /2 \sim 0$ or $\pi /2$.
By combining the symmetries with the four-zero texture, the mass eigenvalues and mixing...
[This is talk will be on Phys.Rev. D100 (2019) no.3, 035009 by Soumita Pramanick]
Using $S3\times Z_2$ symmetry a scotogenic model for realistic neutrino mixing
at one-loop level will be discussed. In this model, there are two right-handed neutrinos.
It was found when these two right-handed neutrinos are mixed maximally one can obtain the
form of the left-handed Majorana neutrino...
The finite modular symmetry provides us with an attractive and novel way to understand lepton flavor mixing, and has recently attracted a lot of attention. In a class of neutrino mass models with modular flavor symmetries, it has been observed that CP symmetry is preserved at the stabilizer of the modulus parameter $\tau = {\rm i}$, whereas significant CP violation emerges within the...
We present a systematic investigation on simple inverse seesaw models for neutrino masses and flavor mixing based on the modular $S^{}_4$ symmetry. Two right-handed neutrinos and three extra fermion singlets are introduced to account for light neutrino masses through the inverse seesaw mechanism and to provide a keV-mass sterile neutrino as the candidate for warm dark matter in our Universe....
In this talk we first review the radiative seesaw scenario in the context of inverse seesaw models, in which small lepton number violating parameters generate radiatively at the one-loop order the observed small light neutrino masses. Then, we show how the supersymmetric version of this radiative mechanism offers cancellations among the one-loop contributions to neutrino masses thanks to a...
In a seesaw scenario, GUT and family symmetry can severely constrain the structure of the Dirac and Majorana mass matrices of neutrinos. We will discuss an interesting case where these matrices are related in such a way that definite predictions for light neutrino masses are achieved without specifying the seesaw scale. This opens up the possibility to consider both high- and low-scale...
We consider light new particles $\chi$ and $\phi$ that carry baryon and lepton numbers. If these particles are lighter than nucleons they lead to exotic decays such as $p\to \pi^+ \chi$ and $p\to e^+\phi$, not yet fully constrained by dedicated searches. For $\chi$ and $\phi$ masses in the GeV range, proton decays are kinematically forbidden but other decays of the forms...
The NA62 experiment at CERN reports searches for K+ → e+N, K+→μ+N and K+→μ+νX decays, where N and X are massive invisible particles, using the 2016-2018 data set.
The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−9) and O(10−8) of the neutrino mixing parameter |Ue4|2 and |Uμ4|2, improving on the earlier searches for heavy neutral...
The study of the lepton flavor universality (LFU) and searches for lepton flavor violation (LFV) attract attention as a probe for the new physics signal. We present the study of LFU violation observables $R_K$ and $R_{K^*}$ in electroweak penguin $B$ decays $B \to K^{(*)} \ell^{+} \ell^{-}$ ($\ell = e, \mu$). We also present search for $B \to K^{*} \tau^{+} \tau^{-}$ as well as LFV decays $B...
The Belle II experiment is a substantial upgrade of the Belle detector and will operate
at the SuperKEKB energy-asymmetric e+e− collider. The design luminosity of the machine
is 8 × 1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor
of 50 more than its predecessor. From February to July 2018, the machine has completed a
commissioning run and main operation of...
The generation of the neutrino mass is an essential observation from the neutrino oscillation experiments. This indicates a major revision of the Standard Model which initiated with the massless neutrinos. A possible interesting scenario is the seesaw mechanism where SM gauge singlet Right Handed Neutrinos are introduced. Another interesting aspect is the extension of the SM with SU$(2)_𝐿$...
In this talk I will show how we calculated the 1<->2 processes of a sterile neutrino with the mass ~100GeV in the early universe. This is essential for evaluating the corresponding leptogenesis processes. The Goldstone equivalence gauge is applied and its application in thermal plasma will be introduced.
Coherent Elastic Neutrino Nucleus Scattering (CE$\nu$NS) provide a novel window to probe new physics connected with the well established non-vanishing neutrino masses. In this talk we will discuss how in the presence of a transition magnetic moment of neutrinos the CE𝜈NS experiments have the potential to shed light on the nature of neutrinos: Dirac vs Majorana. In particular, we will take the...
MicroBooNE is an 85-ton active mass liquid argon time projection chamber (LArTPC) at Fermilab. Its excellent calorimetry and resolution (both spatial and energy), along with its exposure to two neutrino beamlines make it a powerful detector not just for neutrino physics, but also for Beyond the Standard Model (BSM) physics and astroparticle physics. The experiment has competitive sensitivity...
