Low Scale Composite Higgs Model and 1.8 $\sim$ 2 TeV Diboson Excess

28 Aug 2015, 18:00
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Jing Shu (Institute of Theoretical Physics, Chinese Academy of Science)


We consider a simple model to explain the recent diboson excess observed by ATLAS and CMS Collaborations in the ``General Composite Higgs" framework with the coset $SO(5)/SO(4) (SU(2)_L \times SU(2)_R)$. The $SU(2)_L$ triplet vector boson $\rho_L$ with mass range of $1.8 \sim 2$ TeV, which would be produced through the Drell-Yan process with sizable diboson decay branching ratio, can account for the excess. By imposing first Weinberg sum rule and positive gauge boson form factors as the theoretical constraints, we also study the other $SU(2)_L \times SU(2)_R$ bidoublet axial resonance $a$, which would cancel all deviations of electroweak obervables induced by $\rho_L$. Furthermore the correlation between tree level $S$ parameter and the $h \rightarrow Z \gamma$ process suggest a large $a$ contribution to $h \rightarrow Z \gamma$ and it is indeed a $\mathcal{O}(1)$ effect in our parameter space which provides a strong hint for our scenario if this diboson excess is confirmed by the $13 \sim 14$ TeV LHC Run II.

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