Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-02-16
Commun.Theor.Phys.49:421-427,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 4 figures
Scientific paper
10.1088/0253-6102/49/2/36
The neutral gauge boson $B_H$ with the mass of hundreds GeV, is the lightest particle predicted by the littlest Higgs(LH) model, and such particle should be the first signal of the LH model at the planed ILC if it exists indeed. In this paper, we study some processes of the $B_H$ production associated with the fermion pair at the ILC, i.e., $\gamma\gamma\to f\bar{f}B_{H}$. The studies show that the most promising processes to detect $B_H$ among $\gamma\gamma\to f\bar{f}B_{H}$ are $\gamma\gamma\to l'^+l'^-B_{H}(l'=e,\mu)$, and they can produce the sufficient signals in most parameter space preferred by the electroweak precision data at the ILC. On the other hand, the signal produced via the certain $B_H$ decay modes is typical and such signal can be easily identified from the SM background. Therefore, $B_H$, the lightest gauge boson in the LH model would be detectable at the photon collider realized at the ILC.
Jin Zhenlan
Liu Suzhen
Wang Xuelei
Zeng Qingguo
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