Drell–Yan constraints on new electroweak states: LHC as a pp → ℓ+ℓ− precision machine
Drell–Yan constraints on new electroweak states: LHC as a pp → ℓ+ℓ− precision machine
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Drell–Yan 对新电弱态的约束：LHC 作为 pp → ℓ+ℓ− 精密机器
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. No
中科院分区：
文献类型：
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作者：
C. Gross;O. Lebedev;J. No
具有零超荷或零弱同位旋的类矢量态的标准模型（SM）扩展受电弱精密测量的约束相当差。然而，这种新的状态会改变规范耦合在高能量下的运行。因此，LHC的Drell-Yan过程pp → l+l−对这些模型施加了有用的限制。相关的观测量包括双轻子不变质量分布Mll和前后不对称AFB。我们发现，LHC运行1的数据和运行2的初始数据超过了LEP的灵敏度，并且已经对这些粒子的存在提出了有意义的限制，随着数据的增加，这些限制将变得越来越强。
The Standard Model (SM) extensions with vector-like states which have either zero hypercharge or zero weak isospin are rather poorly constrained by the electroweak precision measurements. Such new states would however modify the running of the gauge couplings at high energies. As a result, the Drell–Yan process pp → l+l− at the LHC places useful constraints on these models. The relevant observables include both the dilepton invariant mass distribution Mll and the forward–backward asymmetry AFB. We find that the LHC Run 1 data and the initial data from Run 2 surpass the sensitivity of LEP and already put meaningful constraints on the existence of such particles, which will become progressively stronger with more data.
影响因子：
2.8
作者：
Ball, Richard D.;Bertone, Valerio;Ubiali, Maria
通讯作者：
Ubiali, Maria