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lHC的希格斯粒子产生

Higgs production at the lHC

Julien Baglio, Abdelhak Djouadi

备注：
49 pages, 19 figures, 9 tables. Addendum included compared to published version with updated results at a c.m. energy of 8 TeV
发表信息：
JHEP 1103:055,2011
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摘要：

本文分析了在欧洲核子研究中心（CERN）大型强子对撞机（LHC）运行初期，质心能量为7 TeV的Higgs粒子的产生过程。我们首先考虑的情况下，标准模型希格斯玻色子，主要是产生在胶子-胶子融合通道，并在其衰变到电弱规范玻色子，$gg\to H \to WW,ZZ,γγ$被检测到。在$\sqrt s=7$ 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，进行评估。重点放在各种理论上的不确定性，影响生产率：从规模变化和参数化的部分子分布函数的显着的不确定性，以及由于使用有效场论的计算中出现的不确定性的下一个到下一个到领先的顺序修正。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。简要地总结了质子对撞机不同质心能量$\sqrt s=8$-10 TeV以及设计能量$\sqrt s= 14$ TeV的意义。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在两个主要通道中的产生：胶子-胶子和底夸克融合，导致希格斯玻色子，随后衰变为τ轻子或$b$ -夸克对，$gg, b\bar b \to {\rm Higgs} \to τ^+τ^-,b\bar b$。分析了$\lhc$的Higgs产生截面和衰变分支比。发现相关的理论不确定性相当大，并且将对可探索的模型参数空间产生重大影响。

英文摘要：

We analyze the production of Higgs particles at the early stage of the CERN large Hadron Collider with a 7 TeV 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, $gg\to H \to WW,ZZ,γγ$. The production cross sections at $\sqrt s=7$ TeV 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, $\sqrt s=8$-10 TeV as well as for the design energy $\sqrt s= 14$ 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, $gg, b\bar b \to {\rm Higgs} \to τ^+τ^-,b\bar b$. 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.

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