PPC 2021: XIV International Workshop on Interconnections between Particle Physics and Cosmology

Session

Neutrinos 2

19 May 2021, 16:00

Conveners

Neutrinos 2

• Anil Thapa

85. Majorana Dark Matter and Neutrino mass in a singlet-doublet extension of the Standard Model

Mr Manoranjan Dutta (Indian Institute of Technology Hyderabad)

19/05/2021, 16:00

Dark Matter

A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an imposed $\mathcal{Z}_2$ symmetry. Being Majorana in...

160. (Talk Cancelled) Rephasing invariant quartets in texture zero neutrino mass matrix and CP violation

Madan Singh (M. N. S Government College Bhiwani Haryana India)

19/05/2021, 16:15

BSM Physics

In this article, I have re-investigated the CP invariants relevant at low energy, for all the seven viable ansatze of texture two zero neutrino mass matrix viz. \textbf{A1, A2, B1, B2, B3, B4 }and \textbf{C}, in the flavour basis. It is found that CP invariance for ansatze \textbf{A1, A2, B3, B4} suffices for model to be CP invariant, and in addition, the CP properties, which is defined...

129. Massive sterile neutrinos in the Early Universe: from thermal decoupling to cosmological constraints

Leonardo Mastrototaro (INFN - National Institute for Nuclear Physics)

19/05/2021, 16:30

BSM Physics

We consider heavy sterile neutrinos $\nu_s$ with mass in the range $10~\mathrm{MeV}≤m_s≤m_π∼135~\mathrm{MeV}$, which are thermally produced in the Early Universe, in collisional processes involving active neutrinos, and freezing out after the QCD phase transition. Notably, if these neutrinos decay after the active neutrino decoupling, they generate extra neutrino radiation and contribute to...

102. Testing the stability of heavy dark matter with up-coming radio neutrino telescopes

Rasmi Enrique Hajjar Muñoz

19/05/2021, 16:45

Dark Matter

In the next decade, ultra-high-energy neutrinos in the EeV energy range will be potentially detected by next-generation neutrino telescopes. Although their primary goals are to observe cosmogenic neutrinos and to gain insight into extreme astrophysical environments, they have the great potential of indirectly probing the nature of dark matter. In this talk, we study the projected sensitivity...

92. Dark Matter in the Type Ib Seesaw Model

Bowen Fu (University of Southampton)

19/05/2021, 17:00

We study the connection between the two indications of physics beyond the Standard Model (SM): the masses and mixing of neutrinos and the existence of dark matter (DM). To have a more testable connection, we consider a minimal type Ib seesaw model instead of the traditional type I seesaw model. In the minimal type Ib seesaw model, the effective neutrino mass operator involves two different...

120. (Talk Cancelled) Constraining Sommerfeld-Enhancement via Inflationary Perturbations: Dark Matter and Neutrino Interactions

Anish Ghoshal (L)

19/05/2021, 17:15

Dark Matter

In ΛCDM cosmology, Dark Matter (DM) and neutrinos are assumed to be non-
interacting. However, several BSM scenarios require DM-neutrino interaction, leading to

DM-neutrino scattering and annihilation of DM into neutrinos. We investigate this scenario
by analysing the PLANCK-2018 and BOSS-BAO 2014 dataset and constrain strength of such
interactions. We also discuss a particle DM model...