arXiv 0908.18112009-08hep-ex

在顶夸克衰变中寻找带电希格斯玻色子玻色子

Search for charged Higgs bosons in top quark decays

D0 Collaboration, V. Abazov

备注：: 10 pages, 8 figures, submitted to PLB
发表信息：: Phys.Lett.B682:278-286,2009
DOI：: 10.1016/j.physletb.2009.11.016

摘要：

我们在顶夸克衰变中寻找带电的希格斯玻色子玻色子。利用费米实验室Tevatron对撞机上\dzero实验记录的约1 ${\text{fb}}^{-1}$积分光度的数据，分析了顶夸克对产生事件的\eplus、\muplus、$ee$、$eμ$、$μμ$、\etau和\mutau末态.我们考虑不同的情况下可能带电希格斯玻色子衰变，一个地方的带电希格斯玻色子衰变成一个魅力和一个奇怪的夸克，另一个地方，它衰变成一个$τ$轻子和一个$τ$中微子和第三个两种衰变出现。我们提取所有这些模型的分支比$B(t\to H^+ b)$的限制。我们使用两种方法，一种是固定的$t\bar{t}$生产横截面，一种是横截面与$B(t\to H^+b)$同时拟合。基于提取的限制，我们排除了带电希格斯玻色子质量和$\tan β$参数空间的最小超对称标准模型的不同情况下的区域。

英文摘要：

We present a search for charged Higgs bosons in top quark decays. We analyze the \eplus, \muplus, $ee$, $eμ$, $μμ$, \etau and \mutau final states from top quark pair production events, using data from about 1${\text{fb}}^{-1}$ of integrated luminosity recorded by the \dzero experiment at the Fermilab Tevatron Collider. We consider different scenarios of possible charged Higgs boson decays, one where the charged Higgs boson decays purely hadronically into a charm and a strange quark, another where it decays into a $τ$ lepton and a $τ$ neutrino and a third one where both decays appear. We extract limits on the branching ratio $B(t\to H^+ b)$ for all these models. We use two methods, one where the $t\bar{t}$ production cross section is fixed, and one where the cross section is fitted simultaneously with $B(t\to H^+b)$. Based on the extracted limits, we exclude regions in the charged Higgs boson mass and $\tan β$ parameter space for different scenarios of the minimal supersymmetric standard model.

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