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arXiv 1208.5532hep-ph
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T宇称次首阶QCD在LHC的最小Higgs模型的$W_H$对产生

$W_H$-pair Production in the Littlest Higgs Model with T parity in next-to-leading order QCD at LHC

Du Song-Ming, Guo Lei, Liu Wen, Ma Wen-Gan, Zhang Ren-You

摘要:

在具有$T$宇称的最小Higgs模型的框架下,我们研究了在CERN大型强子对撞机上的$W_H$对产生,直到QCD次领先阶(NLO)。最后衰变产物的运动学分布和理论依赖的因子化/重整化尺度上的截面进行了分析。在QCD非线性光学计算中,我们采用PROSPINO方案来避免重复计算,并保持微扰QCD描述的收敛性。计算结果表明,在$14 TeV$-$(8 TeV)$ LHC上,当对称破缺标度$f$从$400 GeV$($400 GeV$)变化到$1.5 TeV$($1.0 TeV$)时,QCD非线性光学修正显著地降低了标度不确定性,并提高了主阶积分截面,其$K$因子在$1.10-1.22$($1.09-1.17$)范围内.我们发现,通过适当地选取横动量、末态带电轻子的不变质量和丢失的横动量的下限,可以从$pp\to W^+ W^- \to e^+ μ^-ν_{e}\barν_μ+X$背景中选择出签名与背景比值高的$W_H$对产生的信号事件.

英文摘要:

In the framework of the littlest Higgs model with $T$ parity, we study the $W_H$-pair production at the CERN Large Hadron Collider up to the QCD next-to-leading order (NLO). The kinematic distributions of final decay products and the theoretical dependence of the cross section on the factorization/renormalization scale are analyzed. We adopt the PROSPINO scheme in the QCD NLO calculations to avoid double counting and keep the convergence of the perturbative QCD description. Our numerical results show that the QCD NLO corrections significantly reduce the scale uncertainty, and enhance the leading order integrated cross section with a $K$-factor in the range of $1.10-1.22$ ($1.09-1.17$) with the symmetry breaking scale $f$ varying from $400 GeV$ ($400 GeV$) to $1.5 TeV$ ($1.0 TeV$) at the $14 TeV$ $(8 TeV)$ LHC. We find that it is possible to select the signal events of the $W_H$-pair production from the $pp\to W^+ W^- \to e^+ μ^-ν_{e}\barν_μ+X$ background with high ratio of signature over background by taking proper lower limits on transverse momenta, invariant mass of the final charged leptons and the missing transverse momentum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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