Source of CP Violation for the Baryon Asymmetry of the Universe

We give a description of why the existence of a fourth generation is likely to provide enough CP violation for baryogenesis, and trace how this observation came about. We survey the current experimental and theoretical pursuits and outline a research agenda, touching upon unitarity violation and very heavy chiral quarks, and comment on how the electroweak phase transition picture might be altered.Comment: Invited talk presented at 2nd International Workshop on Dark Matter, Dark Energy and Matter-antimatter Asymmetry, Hsinchu, Taiwan, November 5-6, 201

Indications for Large Rescattering in Rare B Decays

The sign of $A_{\rm CP}(K^-\pi^+) < 0$, the evidence for $\bar B^0 \to \pi^0\pi^0$, and the possibly sizable $A_{\pi\pi}$ and $S_{\pi\pi}$ in $\bar B^0 \to \pi^+\pi^-$ all suggest that final state rescattering may be needed in $\bar B\to PP$ decay, which is echoed by large color suppressed $\bar B^0\to D^0h^0$ modes. An SU(3) formalism of ${\bf 8}\otimes {\bf 8} \to {\bf 8}\otimes {\bf 8}$ rescattering in $PP$ final states leads to interesting predictions, in particular allowing for small $\bar B^0 \to K^-K^+$.Comment: 3 pages, 3 figures. Talk presented at EPS2003 Conference, Aachen, Germany, July 200

A brief (p)review on a possible fourth generation world to come

We pick up the thread of $B\to K\pi$ direct CPV (DCPV) difference, linking to the 4th generation prediction (and current quest) of $t$-dependent CPV (TCPV) in $B_s \to J/\psi\,\phi$. We then soar up to the heavens with possible source of CPV for the Universe (CPV-4-U); for the "cauldron" that stirs strong phase transitions, we raise the possible link between electroweak symmetry breaking and large Yukawa couplings (4-EWSB). With the prognosis for 2011, 2012 and beyond, we stress these as preview for the possible 4th generation to come: CPV-4-U and the \emph{raison d'\^etre} for our Universe (and ourselves); 4-EWSB and the \emph{raison d'\^etre} for the LHC itself.Comment: Talk given at 35th International Conference on High Energy Physics (ICHEP2010), Paris, France, July 22-28, 201

Effects of New Physics on CP Violation in B Decays

We discuss two models with 1 extra CP phase in $b\leftrightarrow s$ transition. The CP phase $\arg (V_{t^\prime s}V_{t^\prime b})$ with fourth generations, previously ignored, could impact on $b\to s\ell^+\ell^-$, $\Delta m_{B_s}$ and $\sin2\Phi_{B_s}$, but does not affect EM and strong penguins. With SUSY at TeV scale, a right-handed ``$\widetilde{sb}_{1}$'' squark can be driven light by flavor mixing. It does not affect $b\to s\ell^+\ell^-$, but can generate $S_{\phi K_S} < 0$ while giving $S_{\eta^\prime K_S} \sim \sin2\Phi_{B_d} \cong0.74$. $B_s$ mixing and $\sin2\Phi_{B_s}$ would likely be large, and $S_{K_S\pi^0\gamma}\neq 0$ in $B^0\to K^{*0}\gamma$ is promising.Comment: 3 pages, 3 figures. Talk presented at EPS2003 Conference, Aachen, Germany, July 200

ElectroWeak BaryoGenesis via Top Transport

We study electroweak baryogenesis driven by the top quark in two Higgs doublet model that allows flavor-changing neutral Higgs couplings. Taking Higgs sector couplings and the additional top Yukawa coupling $\rho_{tt}$ to be $\mathcal{O}$(1), one naturally has first order electroweak phase transition and sufficient $CP$ violation to fuel the cosmic baryon asymmetry. Even if $\rho_{tt}$ vanishes, the favor-changing coupling $\rho_{tc}$ can still achieve baryogenesis. Phenomenological consequences such as $t\to ch$, $\tau \to \mu\gamma$, electron electric dipole moment, $h\to\gamma\gamma$, and $hhh$ coupling are discussed. The extra scalars $H^0$, $A^0$ and $H^\pm$ are sub-TeV in mass, and can be searched for at the LHC.Comment: 5 pages, 3 figures, to appear in proceedings of EPS-HEP2017 held July 2017 in Venic

What Can We Learn from Charmless Rare B Decays - the Past/Next 3 Years

A personal perspective is given on physics of charmless rare B decays: 1997 -- 2003.Comment: 6 pages, 2 eps figures included. Invited talk presented at joint session of the 8th Asia Pacific Physics Conference (APPC 2000) and 3rd ACFA Workshop on Physics/Detector at the Linear Collider (ACFA-LC3), Taipei, Taiwan, August 200

Fourth Generation -- Towards Effect of Large Yukawa Coupling

In this talk we cover two threads regarding the 4th generation: on CP violation, from Earth up to the Heavens, i.e. from accelerator-based experimental studies, towards baryon asymmetry of the Universe; and on direct search bounds on $m_{t'}$ and $m_{b'}$, towards the possibility of electroweak symmetry breaking through large Yukawa couplings. Prospects and discussions are presented.Comment: Plenary talk presented at TOP2010, May 31 - June 4, 2010, Bruges, Belgiu