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arXiv 1012.5814hep-ph
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重型八重体和兆电子伏特加速器信号有三个或四个b型喷气机

Heavy octets and Tevatron signals with three or four b jets

Yang Bai, Bogdan A. Dobrescu

摘要:

假设自旋为0的色八重粒子,通过它们的QCD耦合在强子对撞机上成对产生,可能导致涉及三个或四个b喷流的最终状态。我们分析了运动学分布的3b的最终状态,区分标量八位体从超对称希格斯玻色子。研究了将SU(3)\times SU(3)规范对称性破坏到QCD规范群的标量扇区,我们发现标量八重态是通过自旋为1的八重态(色子)成对共振产生的。质量在140 - 150 GeV范围内的标量八重态可以解释CDF协作组报告的b-喷流横向能量分布的非标准形状,特别是当色子质量略高于标量质量的两倍时。标量八隅体的主要衰变模式是进入一对胶子,因此在这个模型中产生的一对双射共振很大,在Tevatron上约为40 pb。即使当W玻色子从初始状态辐射时,在标量八重态质量附近产生双射共振的包含性截面仍然相当大,约为0.15 pb。

英文摘要:

Hypothetical color-octet particles of spin 0, pair-produced at hadron colliders through their QCD coupling, may lead to final states involving three or four b jets. We analyze kinematic distributions of the 3b final state that differentiate the scalar octets from supersymmetric Higgs bosons. Studying the scalar sector that breaks an SU(3) \times SU(3) gauge symmetry down to the QCD gauge group, we find that the scalar octet is resonantly produced in pairs via a spin-1 octet (coloron). A scalar octet of mass in the 140 - 150 GeV range can explain the nonstandard shape of the b-jet transverse energy distributions reported by the CDF Collaboration, especially when the coloron mass is slightly above twice the scalar mass. The dominant decay mode of the scalar octet is into a pair of gluons, so that the production of a pair of dijet resonances is large in this model, of about 40 pb at the Tevatron. Even when a W boson is radiated from the initial state, the inclusive cross section for producing a dijet resonance near the scalar octet mass remains sizable, around 0.15 pb.

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