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arXiv 2008.05526hep-ex
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在multi-TeV紧凑型直线对撞机上产生顶夸克对的助推拓扑的物理势

Physics potential for boosted topologies in top-quark pair production at a multi-TeV Compact Linear Collider

R. Ström, P. Roloff

摘要:

在高亮度线性正负电子紧凑型对撞机(CLIC)上,研究了质心能量为1.4TeV和3 TeV的顶夸克对产生过程中助推拓扑的物理势.本文提出的分析集中在“单轻子+喷流”ttbar的最终状态,并应用喷流子结构技术来探索高度准直喷流环境超过1 TeV。带电轻子被用来确定两个顶夸克的电荷。我们提出的ttbar生产截面和运动区域的前向后不对称性,其中有效碰撞能量为1.2 TeV(2.6 TeV)以上的操作在1.4 TeV(3 TeV),考虑到CLIC光度谱和初始状态辐射的结果。结果是基于详细的蒙特卡罗模拟研究与GEANT 4为基础的模拟CLIC_ILD探测器的概念和粒子流为基础的事件重建。考虑的所有数据样本包括束诱导背景和其他相关背景过程。在积分亮度为2.0逆阿托巴恩(4.0逆阿托巴恩)和电子极化率为-80%的情况下,在1.4 TeV(3 TeV)下运行时,ttbar产生截面和前后不对称性的预期精度分别为1.1%(2.0%)和1.4%(2.3%)。对于改进的超越标准模型的范围,也可以预见在+80%电子极化下运行,在1.4 TeV(3 TeV)下的积分亮度为0.5 inverse attobarn(1.0 inverse attobarn),其中相应的数字大约高出2.5倍。

英文摘要:

The physics potential for boosted topologies in top-quark pair production is studied at centre-of-mass energies of 1.4 TeV and 3 TeV at the proposed high-luminosity linear electron-positron Compact Linear Collider (CLIC). The analyses presented in this paper focus on "single lepton+jets" ttbar final states and apply jet sub-structure techniques to explore the highly collimated jet environment above 1 TeV. The charged lepton is used to determine the charge of both top quarks. We present results for the ttbar production cross section and the forward-backward asymmetry in the kinematic region where the effective collision energy is above 1.2 TeV (2.6 TeV) for operation at 1.4 TeV (3 TeV), taking into account the CLIC luminosity spectrum and initial-state radiation. The results are based on detailed Monte Carlo simulation studies with a GEANT4 based simulation of the CLIC_ILD detector concept and particle-flow based event reconstruction. All data samples considered include beam-induced backgrounds and other relevant background processes. The expected precision on the ttbar production cross section and the forward-backward asymmetry are 1.1% (2.0%) and 1.4% (2.3%), respectively, for operation at 1.4 TeV (3 TeV) with an integrated luminosity of 2.0 inverse attobarn (4.0 inverse attobarn) and with -80% electron polarisation. For improved Beyond Standard Model reach, operation is also foreseen at +80% electron polarisation, with an integrated luminosity of 0.5 inverse attobarn (1.0 inverse attobarn) at 1.4 TeV (3 TeV), where the corresponding numbers are about a factor 2.5 higher.

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