Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 2 figures, contribution to the proceedings of the 2011 Europhysics Conference on High Energy Physics (EPS-HEP 2011),
Scientific paper
A colored weak singlet scalar state with hypercharge 4/3 is one of the possible candidates for the explanation of the unexpectedly large forward-backward asymmetry in $t \bar t$ production as measured by the CDF and D0 experiments. We investigate the role of this state in a plethora of flavor changing neutral current processes and precision observables of down-quarks and charged leptons. Our analysis includes tree- and loop-level mediated observables in the K and B systems, the charged lepton sector, as well as the $Z \to b \bar b$ width. We perform a fit of the relevant scalar couplings. This approach can explain the $(g-2)_\mu$ anomaly while tensions among the CP violating observables in the quark sector, most notably the nonstandard CP phase (and width difference) in the $B_s$ system cannot be fully relaxed. The results are interpreted in a class of GUT models which allow for a light colored scalar with a mass below 1 TeV.
Dorsner Ilja
Drobnak Jure
Fajfer Svjetlana
Kamenik Jernej F.
Kosnik Nejc
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