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arXiv 1003.4312hep-ph
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一般2 HDM下线性对撞机上Higgs-strahlung事件的量子效应

Quantum effects on Higgs-strahlung events at Linear Colliders within the general 2HDM

David Lopez-Val, Joan Sola, Nicolas Bernal

摘要:

在一般的双Higgs模型(2 HDM)下,研究了中性希格斯玻色子玻色子与Z规范玻色子在未来直线对撞机(如ILC和CLIC)中的关联产生.我们计算相应的生产横截面在一个循环,完全符合现有的理论和唯象约束。结果表明,波函数重整化修正是量子效应的主要来源,这种效应是大的负的,主要分布在\tan β=1和λ 5的中等值(λ 5 < 0)附近。这种行为最终可以追溯到三重希格斯玻色子自耦合的增强势,这是2 HDM的标志性特征,在最小超对称标准模型的希格斯扇区中没有对应物。预测的希格斯辐射率可以轻松地达到几十个毫微微巴恩,这意味着每500个毫微微巴恩的积分亮度中只有10^3 - 10^4个事件。由于它们的互补性很大,我们认为,结合分析的希格斯辐射事件和以前计算的单回路希格斯对生产过程可能有助于探测希格斯部门在未来的直线加速器设施的结构。

英文摘要:

The associated production of neutral Higgs bosons with the Z gauge boson is investigated in the context of the future linear colliders, such as the ILC and CLIC, within the general two-Higgs-doublet model (2HDM). We compute the corresponding production cross-sections at one-loop, in full consistency with the available theoretical and phenomenological constraints. We find that the wave-function renormalization corrections to the external Higgs fields are the dominant source of the quantum effects, which turn out to be large and negative, and located predominantly in the region around \tanβ=1 and moderate values of the parameter λ_5 (being λ_5 < 0). This behavior can be ultimately traced back to the enhancement potential of the triple Higgs boson self-couplings, a trademark feature of the 2HDM with no counterpart in the Higgs sector of the Minimal Supersymmetric Standard Model. The predicted Higgs-strahlung rates comfortably reach a few tens of femtobarn, which means barely 10^3 - 10^4 events per 500 inverse femtobarn of integrated luminosity. Due to their great complementarity, we argue that the combined analysis of the Higgs-strahlung events and the previously computed one-loop Higgs-pair production processes could be instrumental to probe the structure of the Higgs sector at future linac facilities.

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