arXiv 1107.02452011-07-01hep-ph

高能$γγ$对撞机上的希格斯玻色子自耦合

Higgs Boson Self-Coupling at High Energy $γγ$ Collider

A. Gutierrez-Rodriguez, Javier Peressutti, O. A. Sampayo

备注：: 14 pages, 6 figures
发表信息：: J.Phys.G38:095002,2011
DOI：: 10.1088/0954-3899/38/9/095002

摘要：

我们分析了标准模型希格斯玻色子在未来$γγ$对撞机能量下的双重产生和三重自耦合，反应为$γγ\rightarrow f \bar f HH$ $(f=b, t)$。我们评估了$f\bar fHH$的总截面，并计算了事件的总数，考虑到在树水平上的完整的费曼图，并为不同的三重耦合值$κλ_{HHH}$。我们还分析了所考虑反应的灵敏度，结果显示为95% C. L。对于质心能量的不同值和背景的不同水平，在$κ-M_H$平面中的区域。数值计算的能量，预计可在一个可能的未来线性$γγ$对撞机与质心能量500-3000 $GeV$和亮度为1和$5 ab^{-1}$。我们发现，考虑到$t$和$H$的衰变产物，过程$γγ\rightarrow t \bar t HH$的事件数量很小，但足以以独立的方式获得关于三重希格斯玻色子玻色子自耦合的信息，补充了关于三重顶点的其他研究。

英文摘要：

We analyzed the double production and the triple self-coupling of the standard model Higgs boson at future $γγ$ collider energies, with the reactions $γγ\rightarrow f \bar f HH$ $(f=b, t)$. We evaluated the total cross section for $f\bar fHH$ and calculated the total number of events considering the complete set of Feynman diagrams at tree-level and for different values of the triple coupling $κλ_{HHH}$. We have also analyzed the sensitivity for the considered reaction and we show the results as 95% C.L. regions in the $κ-M_H$ plane for different values of the center of mass energy and different levels of background. The numerical computation was done for the energies which are expected to be available at a possible Future Linear $γγ$ Collider with a center-of-mass energy 500-3000 $GeV$ and luminosities of 1 and $5 ab^{-1}$. We found that the number of events for the process $γγ\rightarrow t \bar t HH$, taking into account the decay products of both $t$ and $H$, is small but enough to obtain information on the triple Higgs boson self-coupling in a independent way, complementing other studies on the triple vertex.

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