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- Indian Institute of Technology GandhinagarIN282 papers
- Tata Institute of Fundamental ResearchIN161 papers
- Centre National de la Recherche ScientifiqueFR100 papers
- Indian Institute of AstrophysicsIN92 papers
- Chinese Academy of SciencesCN71 papers
- Aryabhatta Research Institute of Observational SciencesIN66 papers
- Inter-University Centre for Astronomy and AstrophysicsIN62 papers
- Harish-Chandra Research InstituteIN54 papers
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- California Institute of TechnologyUS46 papers
17 papers · 2 filters
Scale of SU(2)_R symmetry breaking and leptogenesis
Ernest Ma, Subir Sarkar, Utpal Sarkar
Models of leptogenesis often invoke the out-of-equilibrium decays of heavy right-handed neutrinos in order to create a baryon asymmetry of the universe through the electroweak phas…
A See-Saw Model for Atmospheric and Solar Neutrino Oscillations
Ernest Ma, D. P. Roy, Utpal Sarkar
We have constructed an explicit see-saw model containing two singlet neutrinos, one carrying a gauge charge with an intermediate mass scale of GeV alon…
Vacuum Solutions of Neutrino Anomalies Through a Softly Broken U(1) symmetry
Anjan S. Joshipura, Saurabh D. Rindani
We discuss an extended SU(2)XU(1) model which naturally leads to mass scales and mixing angles relevant for understanding both the solar and atmospheric neutrino anomalies in terms…
CP violation in the mass matrix of heavy neutrinos
Utpal Sarkar, R. Vaidya
We discuss the question of CP-violation in the effective Hamiltonian approach in models of leptogenesis through heavy right handed neutrino decays. We first formulate the problem i…
CP-violating Z-gamma-gamma and top-quark electric dipole couplings in gamma gamma -> t bar{t}
P. Poulose, Saurabh D. Rindani
An effective anomalous CP-violating Z-gamma-gamma coupling can give rise to observable CP-odd effects in gamma gamma -> t bar{t}. We study certain asymmetries in the decay lepton d…
Degenerate Dirac Neutrinos
Utpal Sarkar
A simple extension of the standard model is proposed in which all the three generations of neutrinos are Dirac particles and are naturally light. We then assume that the neutrino m…