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62 papers · 1 filter
Ansatz for small FCNC with a non-universal
Xiao-Gang He, German Valencia
It is well known that a non-universal induces tree-level FCNC which are severely constrained by experiment, most notably meson mixing. We point out that there is a class…
Probing New Physics in Charm Couplings with FCNC
Xiao-Gang He, Jusak Tandean, G. Valencia
Low-energy experiments involving kaon, B-meson, D-meson, and hyperon flavor-changing neutral transitions have confirmed the loop-induced flavor-changing neutral current (FCNC) pict…
Unified triminimal parametrizations of quark and lepton mixing matrices
Xiao-Gang He, Shi-Wen Li, Bo-Qiang Ma
We present a detailed study on triminimal parametrizations of quark and lepton mixing matrices with different basis matrices. We start with a general discussion on the triminimal e…
Lepton FCNC in Type III Seesaw Model
Xiao-Gang He, Sechul Oh
In Type III seesaw model, there are tree level flavor changing neutral currents (FCNC) in the lepton sector, due to mixing of charged particles in the leptonic triplet introduced t…
Fourth Generation Leptons and Muon
Wei-Shu Hou, Fei-Fan Lee, Chien-Yi Ma
We consider the contributions to from fourth generation heavy neutral and charged leptons, and , at the one-loop level. Diagrammatically, there are two types of cont…
U_A(1) Anomaly in Hot and Dense QCD and the Critical Surface
Jiunn-Wei Chen, Kenji Fukushima, Hiroaki Kohyama +2
We discuss the chiral phase transition in hot and dense QCD with three light flavors. Inspired by the well known fact that the U_A(1) anomaly could induce first order phase transit…