arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1010.2129hep-ph
收藏

Tevatron和LHC上CP破坏的MSSM希格斯粒子

CP-violating MSSM Higgs at Tevatron and LHC

Siba Prasad Das, Manuel Drees

摘要:

本文分析了在目前运行的强子对撞机上,利用PYTHIA事件发生器在CP破坏MSSM的框架下观测到中间中性希格斯玻色子($h_2$)衰变为两个较轻的希格斯玻色子($h_1$)的前景。我们用$W h_2 \ra W h_1 h_1 \ra \ell ν_\ell b \bar b b\bar b$研究了从关联$W h_2$产生的轻子+ 4-喷注+ $\met$通道。我们需要两到三个带标记的$b$ -喷气机。我们明确地考虑了所有相关的标准模型背景,将$c$ -喷流与光味喷流和胶子喷流分开处理,并允许错置。我们发现,这是很难观察到这个签名在Tevatron,即使有20 FB $^{-1}$的数据,在LEP-允许的区域的参数空间,由于小信号效率。在大型强子对撞机,先验巨大的SM背景可以通过应用明智选择的运动学选择抑制。在所有切割之后,我们留下约0.5 fb的信号截面,以及1.2和2.9之间的信号背景比。根据我们的分析,一旦在$\sqrt{s}=14$ TeV上积累了20到50 fb的$^{-1}$数据,这个希格斯信号在LHC上应该是可行的。

英文摘要:

We analyze the prospect for observing the intermediate neutral Higgs boson ($h_2$) in its decay to two lighter Higgs bosons ($h_1$) at the presently operating hadron colliders in the framework of the CP violating MSSM using the PYTHIA event generator. We consider the lepton+ 4-jets+ $\met$ channel from associate $W h_2$ production, with $W h_2 \ra W h_1 h_1 \ra \ell ν_\ell b \bar b b\bar b$. We require two or three tagged $b$-jets. We explicitly consider all relevant Standard Model backgrounds, treating $c$-jets separately from light flavor and gluon jets and allowing for mistagging. We find that it is very hard to observe this signature at the Tevatron, even with 20 fb$^{-1}$ of data, in the LEP--allowed region of parameter space due to the small signal efficiency. At the LHC, a priori huge SM backgrounds can be suppressed by applying judiciously chosen kinematical selections. After all cuts, we are left with a signal cross section of around 0.5 fb, and a signal to background ratio between 1.2 and 2.9. According to our analysis this Higgs signal should be viable at the LHC in the vicinity of present LEP exclusion once 20 to 50 fb$^{-1}$ of data have been accumulated at $\sqrt{s}=14$ TeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑