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Vector-like top/bottom-quark partners and Higgs physics at the LHC

机译:大型强子对撞机中类似于矢量的上/下夸克伙伴和希格斯物理学

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摘要

Vector-like quarks (VLQ) that are partners of the heavy top and bottom quarks are predicted in many extensions of the standard model (SM). We explore the possibility that these states could explain not only the long-standing anomaly in the forward–backward asymmetry in b-quark production at LEP, AFBb, but also the more recent  ∼ 2σ deviation of the cross section for the associated Higgs production with top-quark pairs at the LHC, σ(pptt¯H). Introducing three illustrative models for VLQs with different representations under the SM gauge group, we show that the two anomalies can be resolved while satisfying all other theoretical and experimental constraints. In this case, the three different models predict VLQ states in the 1–2 TeV mass range that can be soon probed at the LHC. In a second step, we discuss the sensitivity on the VLQ masses and couplings that could be obtained by means of a percent level accuracy in the measurement of ratios of partial Higgs decay widths, in particular Γ(H → γγ)/Γ(H → ZZ) and Γ(Hbb¯)/Γ(HWW). We show that top and bottom VL partners with masses up to  ∼ 5 TeV and exotic VLQs with masses in the 10 TeV range can be probed at the high-luminosity LHC.
机译:在标准模型(SM)的许多扩展中,都预测到了像矢量夸克(VLQ)这样的重夸克和夸克的伙伴。我们探讨了这些状态不仅可以解释LEP的b夸克生成中前后不对称的长期异常的可能性, A FB b < / mi> ,但在LHC上具有顶部夸克对的相关希格斯生产的横截面的最新〜2σ偏差, σ p p t <移动者accent =“ true”> < mi> t H 。引入SM规范组下具有不同表示形式的VLQ的三个说明性模型,我们表明可以解决这两个异常,同时满足所有其他理论和实验约束。在这种情况下,三种不同的模型预测了1-2 TeV质量范围内的VLQ状态,可以很快在LHC上进行探测。在第二步中,我们讨论了在测量部分希格斯衰变宽度之比,特别是Γ(H→γγ)/Γ(H→)时,可以通过百分比水平精度获得的关于VLQ质量和耦合的灵敏度。 ZZ )和 Γ H b b < / mover> / Γ < mo Stretchy =“ false”>( H W W 。我们显示,可以在高光度LHC上探测质量最高为5 TeV的顶部和底部VL合作伙伴以及质量在10 TeV范围内的奇异VLQ。

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