22 citations · 74 across the 15 of their papers we have counts for
15 papers
Color-Kinematics Relation from the Feynman Diagram Perspective
C. S. Lam
Feynman diagrams for gluon tree amplitudes are studied in the Feynman gauge and in any number of spacetime dimensions. The color-kinematics combinations of numerato…
CHY Theory for Several Fields
C. S. Lam
The Cachazo-He-Yuan (CHY) formula was originally proposed to describe on-shell scattering of particles from a single massless field. We present a method to modify it to include sev…
Pfaffian Diagrams for Gluon Tree Amplitudes
C. S. Lam
Pfaffian diagrams are formulated to represent gluon amplitudes computed from the Cachazo-He-Yuan (CHY) formula. They may be regarded as a systematic regrouping of Feynman diagrams…
The Role of Möbius Constants and Scattering Functions in CHY Scalar Amplitudes
C. S. Lam, York-Peng Yao
The integrations leading to the Cachazo-He-Yuan (CHY) double-color -point massless scalar amplitude are carried out one integral at a time. Möbius invariance dictates the final…
Off-Shell CHY Amplitudes
C. S. Lam, York-Peng Yao
The Cachazo-He-Yuan (CHY) formula for on-shell scattering amplitudes are extended off-shell. The off-shell amplitudes are Möbius invariant, and have the same momentum poles as the…
Permutation Symmetry of the Scattering Equations
C. S. Lam
Closed formulas for tree amplitudes of -particle scatterings of gluon, graviton, and massless scalar particles have been proposed by Cachazo, He, and Yuan. It depends on …
A Built-in Horizontal Symmetry of
C. S. Lam
In a renormalizable theory, all fermion mass matrices are linear combinations of three fundamental types, , and , whose superscripts i…
A Horizontal Symmetry for Leptons and Quarks
C. S. Lam
A generic valon potential invariant under U(1)\x SO(3) is used to determine whether the horizontal symmetry of leptons is , , or some other finite subgroups of SO(3). Val…
Horizontal Symmetry from the Bottom Up
C. S. Lam
A general method to derive horizontal symmetry from a mixing matrix is reviewed. The technique has been applied to deduce leptonic symmetry from the tri-bimaximal neutrino mixing m…
A Higgs Test of Horizontal Symmetry
C. S. Lam
Identical interactions found in the three families of quarks and leptons suggest the presence of a horizontal symmetry. We discuss how such a symmetry can be tested by measuring th…
Probing Extra Dimensions with Neutrino Oscillations
C. S. Lam
In the braneworld scenario, gravity and neutrino oscillation can both be used to detect the presence of an extra dimension. We argue that neutrino oscillation is particularly suita…
Neutrino Oscillations in Extra Dimensions
C. S. Lam
The characteristics and phenomenology of neutrino oscillation in extra dimensions are briefly reviewed
Time Ordering, Energy Ordering, and Factorization
C. S. Lam
Relations between integrals of time-ordered product of operators, and their representation in terms of energy-ordered products are studied. Both can be decomposed into irreducible…
String Rearrangement of Gauge Theories
C. S. Lam
Feynman diagram expressions in ordinary field theories can be written in a string-like manner. The methods and the advantages for doing so are briefly discussed.
From Multiloop Spinor Helicity Technique to String Reorganization
C. S. Lam
The success of the spinor helicity technique for tree processes is reviewed. To apply it to multiloop diagrams one is naturally led to the Schwinger proper-time representation, who…