122 citations · 956 across the 36 of their papers we have counts for
35 papers · 1 filter
New limits on from meson decays
Gustavo F. S. Alves, Chee Sheng Fong, Luighi P. S. Leal +1
In this letter we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass of a right-handed vector boson, such as the one that ap…
New Physics in Neutrino Oscillation: Nonunitarity or Nonorthogonality?
Chee Sheng Fong
Neutrino oscillation phenomenon is a definite evidence of physics beyond the Standard Model (SM) and high precision measurement of neutrino properties will certainly give us clue a…
Theoretical Aspect of Nonunitarity in Neutrino Oscillation
Chee Sheng Fong
Nonunitarity can arise in neutrino oscillation when the matrix with elements which relate the neutrino flavor and mass eigenstates is not unitary when sum…
Snowmass Theory Frontier: Astrophysics and Cosmology
Daniel Green, Joshua T. Ruderman, Benjamin R. Safdi +84
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. This Report is prepared as the TF09 "Astrophy…
Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
C. A. Argüelles, G. Barenboim, M. Bustamante +23
Neutrinos are one of the most promising messengers for signals of new physics Beyond the Standard Model (BSM). On the theoretical side, their elusive nature, combined with their un…
Rescuing High-Scale Leptogenesis using Primordial Black Holes
Nicolás Bernal, Chee Sheng Fong, Yuber F. Perez-Gonzalez +1
We explore the interplay between light primordial black holes (PBH) and high-scale baryogenesis, with a particular emphasis on leptogenesis. We first review a generic baryogenesis…
Baryogenesis in the Standard Model and its Supersymmetric Extension
Chee Sheng Fong
In this work, we classify all the effective symmetries and their associated Noether charges in the Standard Model (SM) and its minimal supersymmetric extension (MSSM) from t…
Leptogenesis in the basis
C. C. Nishi, Chee Sheng Fong
We formulate three-flavor type-I leptogenesis in the basis which is convenient because in the three-flavor regime, both and charged lepton Yukawa interactions are in t…
Mirror Dirac leptogenesis
Kevin Earl, Chee Sheng Fong, Thomas Gregoire +1
We consider a mirror world scenario, in which light Dirac neutrinos are generated from a seesaw mechanism and leptogenesis occurs at high scale without violating lepton number. Aft…
Sharing but not Caring: Collider Phenomenology
Nicolás Bernal, Chee Sheng Fong, Alberto Tonero
Based on a previous work on scenarios where the Standard Model and dark matter particles share a common asymmetry through effective operators at early time in the Universe and late…
A cosmological pathway to testable leptogenesis
Bhaskar Dutta, Chee Sheng Fong, Esteban Jimenez +1
Leptogenesis could have occurred at temperatures much lower than generally thought, if the cosmological history of the Universe underwent a period of accelerated expansion, as is p…
Hybrid seesaw leptogenesis and TeV singlets
Kaustubh Agashe, Peizhi Du, Majid Ekhterachian +3
The appealing feature of inverse seesaw models is that the Standard Model (SM) neutrino mass emerges from the exchange of TeV scale singlets with sizable Yukawa couplings, which ca…
Non-unitary evolution of neutrinos in matter and the leptonic unitarity test
Chee Sheng Fong, Hisakazu Minakata, Hiroshi Nunokawa
We present a comprehensive study of the three-active plus sterile neutrino model as a framework for constraining leptonic unitarity violation induced at energy scales much lowe…
Probing Leptogenesis
E. J. Chun, G. Cvetič, P. S. B. Dev +12
The focus of this chapter lies on the possible experimental tests of leptogenesis scenarios. We consider both leptogenesis generated from oscillations, as well as leptogenesis from…
A framework for testing leptonic unitarity by neutrino oscillation experiments
Chee Sheng Fong, Hisakazu Minakata, Hiroshi Nunokawa
If leptonic unitarity is violated by new physics at an energy scale much lower than the electroweak scale, which we call low-scale unitarity violation, it has different characteris…
Baryogenesis from Symmetry Principle
Chee Sheng Fong
In this work, a formalism based on symmetry which allows one to express asymmetries of all the particles in terms of conserved charges is developed. The manifestation of symmetry a…
Leptogenesis in SO(10)
Chee Sheng Fong, Davide Meloni, Aurora Meroni +1
We consider Grand Unified Theories (GUTs) with vacuum expectation values (vevs) for fermion masses in the representation. We show t…
Possible Interpretations of IceCube High-Energy Neutrino Events
Chee Sheng Fong, Hisakazu Minakata, Boris Panes +1
We discuss possible interpretations of the 37 high energy neutrino events observed by the IceCube experiment in the South Pole. We examine the possibility to explain the observed n…
Cloistered Baryogenesis
D. Aristizabal Sierra, Chee Sheng Fong, Enrico Nardi +1
The cosmological matter-antimatter asymmetry can arise from the baryon number conserving CP asymmetry in two body decays of heavy particles, when the two final states carry equal a…
Quark masses, mixings, and CP violation from spontaneous breaking of flavor
Chee Sheng Fong, Enrico Nardi
A invariant scalar potential breaking spontaneously the quark flavor symmetry can explain the standard model flavor pu…
Spontaneous breaking of the flavor symmetry avoids the strong CP problem
Chee Sheng Fong, Enrico Nardi
A promising approach to the Standard Model flavor puzzle is based on the idea that the quark-flavor symmetry is spontaneously broken by vacuum expectation values of `Yuka…
New ways to TeV scale leptogenesis
Chee Sheng Fong, M. C. Gonzalez-Garcia, Enrico Nardi +1
We show that by adding to the standard model plus the type I seesaw different types of scalars, it is possible to construct models that satisfy the three requirements of (i) genera…
Leptogenesis in the Universe
Chee Sheng Fong, Enrico Nardi, Antonio Riotto
Leptogenesis is a class of scenarios in which the cosmic baryon asymmetry originates from an initial lepton asymmetry generated in the decays of heavy sterile neutrinos in the earl…
Yukawa hierarchies from spontaneous breaking of the $\bma{SU(3)_L\times SU(3)_R}$ flavour symmetry?
Jose R. Espinosa, Chee Sheng Fong, Enrico Nardi
The tree level potential for a scalar multiplet of `Yukawa fields' for one type of quarks admits the promising vacuum configuration that breaks…