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arXiv 1105.2699hep-phhep-ex
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有色标量与CDF $W+$双喷射过剩

Colored Scalars And The CDF $W+$dijet Excess

Tsedenbaljir Enkhbat, Xiao-Gang He, Yukihiro Mimura, Hiroshi Yokoya

摘要:

CDF最近报道的关于$W+$双喷注过剩的数据可以解释为伴随产生了一个$W$和一个质量约为150 GeV的新粒子,该粒子随后衰变为两个强子喷注。本文研究了用色标量玻色子解释$W+$双喷流过剩的可能性。有几种色标量可以与两个夸克进行树级可重整化的Yukawa耦合,$({\bf 8}, {\bf 2},1/2)$,$(\bar{\bf 6}({\bf 3}), {\bf 3}({\bf 1}), -1/3)$,$(\bar {\bf 6}({\bf 3}), {\bf 1}, -4/3(2/3))$。如果其中一个标量的质量约为150 GeV,那么它被着色就可以很自然地解释为什么过剩的质量只以两个强子喷流的形式出现。虽然所需的生产截面和质量把约束模型参数和排除一些可能的情况下,面对其他现有的数据,特别是FCNC数据,我们发现,有很强的约束Yukawa耦合这些标量。如果不强制耦合成为某种特殊的纹理形式,除了$({\bf 3}, {\bf 3}, -1/3)$,大多数标量都有FCNC数据的问题。我们还研究了在RHIC和LHC上寻找这些新粒子的一些特征,发现相关信息可以帮助进一步区分不同的模型。

英文摘要:

The recent data on $W+$dijet excess reported by CDF may be interpreted as the associated production of a $W$ and a new particle of mass about 150 GeV which subsequently decays into two hadron jets. We study the possibility of explaining the $W+$dijet excess by colored scalar bosons. There are several colored scalars which can have tree level renormalizable Yukawa couplings with two quarks, $({\bf 8}, {\bf 2},1/2)$, $(\bar{\bf 6}({\bf 3}), {\bf 3}({\bf 1}), -1/3)$, $(\bar {\bf 6}({\bf 3}), {\bf 1}, -4/3(2/3))$. If one of these scalars has a mass about 150 GeV, being colored it can naturally explain why the excess only shows up in the form of two hadron jets. Although the required production cross section and mass put constraints on model parameters and rule out some possible scenarios when confronted with other existing data, in particular FCNC data, we find that there are strong constraints on the Yukawa couplings of these scalars. Without forcing the couplings to be some special texture forms most of the scalars, except the $({\bf 3}, {\bf 3}, -1/3)$, are in trouble with FCNC data. We also study some features for search of these new particles at the RHIC and the LHC and find that related information can help further to distinguish different models.

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。

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