Higgs production at the lHC
Higgs production at the lHC
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DOI：
10.1007/jhep03(2011)055
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发表时间：
2011-03-01
影响因子：
5.4
通讯作者：
Djouadi, Abdelhak
中科院分区：
文献类型：
--
作者：
Baglio, Julien;Djouadi, Abdelhak
本文分析了欧洲核子研究中心（CERN）大型强子对撞机（LHC）在7 TeV质心能量下早期Higgs粒子的产生。我们首先考虑标准模型希格斯玻色子的情况，它主要产生于胶子-胶子融合通道，并在其衰变为电弱规范玻色子时被检测到，gg -> H -> WW，ZZ，gamma gamma。在根s = 7 TeV的产生截面和衰变分支比，包括所有相关的高阶QCD和电弱修正，进行了评估。重点放在各种理论的不确定性，影响生产率：显着的不确定性，从尺度变化和参数化的部分子分布函数，以及由于使用有效场理论在计算的下一个下一个领先的顺序修正所产生的不确定性。强耦合常数和重夸克质量的希格斯衰变分支比的值所产生的参数的不确定性，这是不可忽略的，也进行了讨论。本文简要地总结了质子对撞机不同质心能量（s = 8-10 TeV）和设计能量（s = 14 TeV）的影响。然后我们讨论了标准模型最小超对称扩展的中性希格斯粒子的产生过程：胶子-胶子和底夸克融合产生希格斯玻色子，希格斯玻色子衰变为τ轻子或b夸克对gg，B（B）over bar -> Higgs -> τ（+）tau（-），B（B）over bar。分析了lHC上希格斯粒子产生截面和衰变分支比。相关的理论不确定性被发现是相当大的，并会有显着的影响，可以探测的模型的参数空间。
We analyze the production of Higgs particles at the early stage of the CERN large Hadron Collider with a 7TeV center of mass energy (lHC). We first consider the case of the Standard Model Higgs boson that is mainly produced in the gluon-gluon fusion channel and to be detected in its decays into electroweak gauge bosons, gg -> H -> WW, ZZ, gamma gamma. The production cross sections at root s = 7TeV and the decay branching ratios, including all relevant higher order QCD and electroweak corrections, are evaluated. An emphasis is put on the various theoretical uncertainties that affect the production rates: the significant uncertainties from scale variation and from the parametrization of the parton distribution functions as well as the uncertainties which arise due to the use of an effective field theory in the calculation of the next-to-next-to-leading order corrections. The parametric uncertainties stemming from the values of the strong coupling constant and the heavy quark masses in the Higgs decay branching ratios, which turn out to be non-negligible, are also discussed. The implications for different center of mass energies of the proton collider, root s = 8-10 TeV as well as for the design energy root s = 14 TeV, are briefly summarized. We then discuss the production of the neutral Higgs particles of the Minimal Supersymmetric extension of the Standard Model in the two main channels: gluon-gluon and bottom quark fusion leading to Higgs bosons which subsequently decay into tau lepton or b-quark pairs, gg, b (b) over bar -> Higgs -> tau(+)tau(-), b (b) over bar. The Higgs production cross sections at the lHC and the decay branching ratios are analyzed. The associated theoretical uncertainties are found to be rather large and will have a significant impact on the parameter space of the model that can be probed.