5,922 research outputs found

    Towards the fate of natural composite Higgs model through single tβ€²t^\prime search at the 8 TeV LHC

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    We analyze the observational potential of single tβ€²t' production in both the tβ€²β†’bWt^\prime \rightarrow bW and tβ€²β†’tht^\prime \rightarrow th decay channels at 8 TeV LHC using an integrated luminosity of 25 fbβˆ’1\text{fb}^{-1}. Our analysis is based on a simplified model with minimal coset SO(5)/SO(4)SO(5)/SO(4) in which the tβ€²t' is a singlet of the unbroken SO(4). The single tβ€²t' production, as a consequence of electroweak symmetry breaking, is less kinematically suppressed, associated with a light forward jet and has boosted decay products at the 8 TeV LHC. Therefore it provides the most promising channel in searching for a heavy tβ€²t'. We have exploited the above kinematical features and used the jet substructure method to reconstruct the boosted Higgs in thth decay channel. It is shown that a strong constraint on the tβ€²bWt^\prime bW coupling (gtβ€²bW/gtbW,SM<0.2∼0.3g_{t^\prime bW}/g_{tbW,SM} < 0.2 \sim 0.3) at the 95% C. L. can be obtained for mtβ€²βŠ‚(700,1000)m_{t'} \subset (700, 1000) GeV.Comment: 22 pages, 8 figures, 5 tables, refs added in v

    Probing the CP-even Higgs Sector via H3β†’H2H1H_3\to H_2H_1 in the Natural NMSSM

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    After the discovery of a Standard Model (SM) like Higgs boson, naturalness strongly favors the next to the Minimal Supersymmetric SM (NMSSM). In this letter, we point out that the most natural NMSSM predicts the following CP-even Higgs HiH_i sector: (A) H2H_2 is the SM-like Higgs boson with mass pushed-upward by a lighter H1H_1 with mass overwhelmingly within [mH2/2,mH2][m_{H_2}/2,m_{H_2}]; (B) mH3≃2ΞΌ/sin⁑2β≳300m_{H_3}\simeq 2\mu/\sin2\beta\gtrsim300 GeV; (C) H3H_3 has a significant coupling to top quarks and can decay to H1H2H_1H_2 with a large branching ratio. Using jet substructure we show that all the three Higgs bosons can be discovered via ggβ†’H3β†’H1H2β†’bbΛ‰β„“Ξ½jjgg\to H_3 \to H_1H_2\to b\bar b \ell\nu jj at the 14 TeV LHC. Especially, the LEP-LHC scenario with H1≃98H_1\simeq98 GeV has a very good discovery potential.Comment: 5 pages, 2 figures. Some typos corrected and reference adde

    Optically-Nonactive Assorted Helices Array with Interchangeable Magnetic/Electric Resonance

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    We report here the designing of optically-nonactive metamaterial by assembling metallic helices with different chirality. With linearly polarized incident light, pure electric or magnetic resonance can be selectively realized, which leads to negative permittivity or negative permeability accordingly. Further, we show that pure electric or magnetic resonance can be interchanged at the same frequency band by merely changing the polarization of incident light for 90 degrees. This design demonstrates a unique approach to construct metamaterial.Comment: 15 pages, 4 figure
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