20,601 research outputs found

    Toward a more realistic holographic QCD model

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    By matching the Dp−DqDp-Dq system in type II superstring theory with the Regge trajectories of vector and axial-vector meson spectra, a possible 5-dimension metric of a Dp−DqDp-Dq soft-wall model has been determined. The dependence of the metric parameters on Regge trajectory parameters has been demonstrated. It is shown that the models defined in DpDp brane background for p=3p=3 or 4 can be consistent with experimental data.Comment: 8 pages, proceedings for the YITP International Symposium "Fundamental Problems in Hot and/or Dense QCD", March 3-6, 2008, Kyoto, Japa

    Associated production of a neutral top-Higgs with a heavy-quark pair in the \gamma\gamma collisions at ILC

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    We have studied the associated production processes of a neutral top-Higgs in the topcolor assisted technicolor model with a pair of heavy quarks in \gamma\gamma collisions at the International Linear Collider (ILC). We find that the cross section for t\bar{t}h_t in \gamma\gamma collisions is at the level of a few fb with the c.m. energy \sqrt{s}=1000 GeV, which is consistent with the results of the cross section of t\bar{t}H in the standard model and the cross section of t\bar{t}h in the minimal supersymmetric standard modeland the little Higgs models. It should be distinct that hundreds of to thousands of h_t per year can be produced at the ILC, this process of \gamma\gamma \to t\bar{t}h_t is really interesting in testing the standard model and searching the signs of technicolor.Comment: 4 pages, 4 figures, some references are adde
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