Dr. Emi Kou

CNRS/LAL, France
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I work on flavour physics phenomenology within and beyond the Standard
Model (SM). Flavour phenomena has a very peculiar pattern:  the
flavour changing neutral current is strongly suppressed or the CP
violation is observed in the K and B meson system but nowhere else. In
the SM, such a pattern is explained nicely by the Glashow-Iliopoulos-
Maiani mechanism or the Kobayashi-Maskawa mechanism. On the other
hand, for new physics models, careful investigations have to be made
on what underlying mechanisms would give these observed patterns.

Many new experimental results in flavour physics are expected in the
near future. In order to discover a signal beyond SM, it is important
to provide as precise theoretical predictions as possible. One of the
biggest challenges in flavour physics is to have a good control of the
strong interaction. Various perturbative and non-perturbative methods
based on quantum chromodynamics (QCD) have been developed to make a
better treatment of the strong interaction.

For my PhD, I studied the puzzle of B-> eta' K reported firstly by the
CLEO collaboration in 1997. In order to explain the observed large
branching fraction to this decay channel, I computed a new type of
diagram including anomaly contribution. I also tested the existence of
the purely gluonic bound state inside of eta'. Later, I investigated
the supersymmetric contributions to this decay mode. Full solution to
this problem has not been provided yet.

Do you want to know more?

• [1].  S.L. Glashow, J. Iliopoulos, L. Maiani, "Weak Interactions with Lepton-Hadron Symmetry'', Phys. Rev. D2, 1285-1292 (1970)
• [2].  M. Kobayashi, T. Maskawa, "CP Violation in the Renormalizable Theory of Weak Interaction", Prog. Theor. Phys. 49, 652-657  (1973)
• [3].  I.I.Y. Bigi, A.I. Sanda, "CP violation", Camb. Monogr. Part. Phys. Nucl. Phys. Cosmol. 9, 1-382 (2000)
• [4].  SuperB Collaboration, "SuperB: A High-Luminosity Asymmetric e+ e- Super Flavor Factory. Conceptual Design Report", arXiv:0709.0451 [hep- ex]
• [5].  LHCb collaboration, "LHCb technical design report: Reoptimized detector design and performance", CERN-LHCC-2003-030, 137 pp (2003)