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arXiv 1503.07394hep-ph
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希格斯玻色子以NLOPS电弱精度衰变为四个轻子

Higgs boson decay into four leptons at NLOPS electroweak accuracy

Stefano Boselli, Carlo M. Carloni Calame, Guido Montagna, Oreste Nicrosini, Fulvio Piccinini

摘要:

鉴于LHC运行II对Higgs扇区的精确研究,提高理论预测的精度已成为一个紧迫的问题。在此框架下,我们详细计算了希格斯玻色子玻色子衰变为四个带电轻子的全次主导阶(NLO)电弱修正,考虑镀金通道H -> Z(*)Z(*)-> 2l 2l ',l,l' = e,μ.我们将NLO修正与QED Parton Shower(PS)相匹配,以模拟排他性的多光子发射,并在NLOPS电弱精度下提供新的结果。我们比较我们的非线性光学预测的程序Prophetry 4f和目前的NLOPS希格斯物理研究相关的唯象结果,特别注意精确测量的希格斯玻色子玻色子质量,自旋宇称分配和测试的标准模型。我们的计算是在一个新的代码,Hto 4l,它可以很容易地接口到任何发电机描述希格斯玻色子玻色子生产。作为一个例子,我们提供了说明性的结果,希格斯生产和衰变的过程中gg -> H -> 4l使用POWHEG与NLOPS精度的生产模式。

英文摘要:

In view of precision studies of the Higgs sector at the Run II of the LHC, the improvement of the accuracy of the theoretical prediction is becoming a pressing issue. In this framework, we detail a calculation of the full Next-to-Leading Order (NLO) electroweak corrections to Higgs boson decay into four charged leptons, by considering the gold-plated channel H -> Z(*) Z(*) -> 2l 2l', l,l' = e, mu. We match the NLO corrections with a QED Parton Shower (PS), in order to simulate exclusive multiple photon emission and provide novel results at NLOPS electroweak accuracy. We compare our NLO predictions to those of the program Prophecy4f and present NLOPS phenomenological results relevant for Higgs physics studies, with particular attention to precision measurements of the Higgs boson mass, spin-parity assignment and tests of the Standard Model. Our calculation is implemented in a new code, Hto4l, which can be easily interfaced to any generator describing Higgs boson production. As an example, we provide illustrative results for Higgs production and decay in the process gg -> H -> 4l using POWHEG with NLOPS accuracy in the production mode.

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