arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.4529hep-ph
收藏

通过大型强子对撞机7 TeV和14 TeV的希格斯搜索实验揭示夸克胶子产生的足迹

Revealing the footprints of squark gluino production through Higgs search experiments at the Large Hadron Collider at 7 TeV and 14 TeV

Biplob Bhattacherjee, Amitava Datta

摘要:

在规范介导的超对称破缺(GMSB)模型中,较轻的标量希格斯玻色子(h)衰变产生的双光子的不变质量分布(h)需要在大型强子对撞机(LHC)上通过专门的h搜索实验进行仔细测量,但与具有更大截面的方胶子事件相关的双光子可能会使其质量分布发生畸变。如果在7 TeV或14 TeV的大型强子对撞机实验中观察到这种扭曲,不仅不利于标准模型,也不利于各种具有可比h质量和耦合但没有由新的重粒子组成的扇区衰变成光子的两个希格斯偶线模型。最小GMSB(mGMSB)模型受LEP中h的质量束缚和Tevatron中最轻的中性伴子的质量束缚的影响可以忽略不计。但在目前流行的广义GMSB(GGMSB)模型中,即使在LHC实验的早期阶段,由于积分亮度不足以发现h,上述分布的尾部也可能显示出统计上显著的过剩事件。我们通过在各种GMSB模型(最小和非最小)中引入几个基准点来说明上述观点。同样的结论来自于CMS协作最近采用的简化GGMSB模型中的详细参数扫描,以解释他们在双光子+ $\etslash$通道中的搜索。其他可观测的数据,如双光子+ X事件的有效质量分布,也可能揭示希格斯扇区之外新的重粒子的存在。对h质量峰的污染及简单的处理方法也进行了讨论。

英文摘要:

The invariant mass distribution of the di-photons from the decay of the lighter scalar Higgs boson(h) to be carefully measured by dedicated h search experiments at the LHC may be distorted by the di-photons associated with the squark-gluino events with much larger cross sections in Gauge Mediated Supersymmetry Breaking (GMSB) models. This distortion if observed by the experiments at the Large Hadron Collider at 7 TeV or 14 TeV, would disfavour not only the standard model but various two Higgs doublet models with comparable h - masses and couplings but without a sector consisting of new heavy particles decaying into photons. The minimal GMSB (mGMSB) model constrained by the mass bound on h from LEP and that on the lightest neutralino from the Tevatron, produce negligible effects. But in the currently popular general GMSB(GGMSB) models the tail of the above distribution may show statistically significant excess of events even in the early stages of the LHC experiments with integrated luminosity insufficient for the discovery of h. We illustrate the above points by introducing several benchmark points in various GMSB models - minimal as well as non-minimal. The same conclusion follows from a detailed parameter scan in a simplified GGMSB model recently employed by the CMS collaboration to interpret their searches in the di-photon + $\etslash$ channel. Other observables like the effective mass distribution of the di-photon + X events may also reveal the presence of new heavy particles beyond the Higgs sector. The contamination of the h mass peak and simple remedies are also discussed.

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。

↑