Precision calculations for h → WW/ZZ → 4 fermions in a singlet extension of the Standard Model with Prophecy4f
Precision calculations for h → WW/ZZ → 4 fermions in a singlet extension of the Standard Model with Prophecy4f
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DOI：
10.1007/jhep04(2018)062
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发表时间：
2018-01
影响因子：
5.4
通讯作者：
Lukas Altenkamp;M. Boggia;S. Dittmaier
中科院分区：
文献类型：
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作者：
Lukas Altenkamp;M. Boggia;S. Dittmaier
考虑标准模型的一个推广，即一个真实的单重标量场具有一个2-对称的拉格朗日量，并且单重场具有真空期望值的自发对称破缺。考虑到理论中两个标量中较轻的一个是125 GeV的希格斯粒子，我们用重希格斯玻色子的质量、混合角α和标量希格斯自耦合λ 12来参数化标量扇区。考虑到微扰性和真空稳定性的理论约束，我们计算了轻Higgs玻色子衰变h→ WW/ZZ→ 4费米子在文献中提出的几种情形下的次-首阶电弱和QCD修正.我们制定了两个重整化方案，并调查计划之间的输入参数的转换，发现相当大的影响。求解参数α和λ 12的重正化群方程，我们观察到次领先阶结果中的尺度和方案依赖性显着降低。对于文献中提出的一些方案，计算过程h→ 4f的总衰变宽度作为混合角的函数，并与相应的标准模型希格斯玻色子的宽度进行比较，显示偏差低于10%。超出标准模型的效应不会导致微分分布出现显着扭曲。的计算中实施的Monte Carlo生成器P rophilo 4 f，这是准备在数据分析中的应用程序的单态扩展的框架。
We consider an extension of the Standard Model by a real singlet scalar field with a ℤ 2-symmetric Lagrangian and spontaneous symmetry breaking with vacuum expectation value for the singlet. Considering the lighter of the two scalars of the theory to be the 125 GeV Higgs particle, we parametrize the scalar sector by the mass of the heavy Higgs boson, a mixing angle α, and a scalar Higgs self-coupling λ 12. Taking into account theoretical constraints from perturbativity and vacuum stability, we compute next-to-leading-order electroweak and QCD corrections to the decays h→ WW/ZZ→ 4 fermions of the light Higgs boson for some scenarios proposed in the literature. We formulate two renormalization schemes and investigate the conversion of the input parameters between the schemes, finding sizeable effects. Solving the renormalization-group equations for theparameters α and λ 12, we observe a significantly reduced scale and scheme dependence in the next-to-leading-order results. For some scenarios suggested in the literature, the total decay width for the process h→ 4f is computed as a function of the mixing angle and compared to the width of a corresponding Standard Model Higgs boson, revealing deviations below 10%. Differential distributions do not show significant distortions by effects beyond the Standard Model. The calculations are implemented in the Monte Carlo generator P rophecy 4 f, which is ready for applications in data analyses in the framework of the singlet extension.